Q. Carbon dioxide is called greenhouse gas because-

  1 it is used in photosynthesis

  2 its absorbs infrared radiation

  3 it emits visible radiation

  4 its concentration remains always higher than other gases

    Ans: 2

Q. What is the major role of a greenhouse gas that contributes to temperature rise of the Earth's surface?

  1 Stops both incoming sunlight and outgoing infrared radiation

  2 Transparent to both incoming sunlight and outgoing infrared radiation

  3 Lets incoming sunlight pass through but stops outgoing infrared radiation

  4 Lets outgoing infrared radiation pass through but stops incoming sunlight

    Ans: 3

Q. Name the process of production of energy in the Sun

  1 Radioactivity

  2 Nuclear fission

  3 Ionization

  4 Nuclear fusion

    Ans: 4

Q. Which of the following in automobile exhaust can cause cancer?

  1 Carbon monoxide

  2 Oxides of nitrogen

  3 Polyclinic hydrocarbons

  4 Lead

    Ans: 1

Q. Who invented chloroform as anaesthetic?

  1 Edward Jenner

  2 James Simpson

  3 Alexander Fleming

  4 Christian Barnard

    Ans: 2

Q. Which of the following is biodegradable?

  1 D.D.T.

  2 Paper

  3 Plastic

  4 Aluminium

    Ans: 2

Q. Which of the following countries has become first to pass Climate Act?

  1 China

  2 USA

  3 Canada

  4 Germany

    Ans: 3

Q. Who invented the ball-point pen:

  1 Lazzlo Biro

  2 Curie

  3 Newton

  4 Baird

    Ans: 1

Q. When did India Join the International Tsunami Warning System?

  1 2005

  2 2007

  3 2006

  4 2004

    Ans: 4

Q. Electrostatic precipitator is used to control--

  1 Water pollution

  2 Solid waste

  3 Noise pollution

  4 Air pollution

    Ans: 4

Q. A new technology which provides the ability to create an artificial world and have people interact with it is called -

  1 Virtual reality

  2 Televirtuality

  3 Alternate reality

  4 3-D reality

    Ans: 2

Q. X-rays were discovered by -

  1 Roentgen

  2 H.Davy

  3 Lavoisier

  4 Faraday

    Ans: 1

Q. Penicillin, an, antibiotic, is obtained from a

  1 Fungus

  2 Virus

  3 Flowering plant

  4 Bacterium

    Ans: 1

Q. Which among the following elements (metals) pollutes the air of a city having large number of automobiles?

  1 Lead

  2 Nickel

  3 Chromium

  4 Cadmium

    Ans: 4

Q. Where was India's first computer installed?

  1 Indian Statistical Institute, Calcutta

  2 Indian Institute of Technology, Delhi

  3 Indian Institute of Science, Bangalore

  4 Indian Iron & Steel Co.Ltd., Burnpur

    Ans: 1

Q. Hydrogen bomb is based on the principle of

  1 uncontrolled fusion reaction

  2 controlled fusion reaction

  3 uncontrolled fission reaction

  4 controlled fission reaction

    Ans: 1

Q. Which type of glass is used for making glass reinforced plastic?

  1 Fibre glass

  2 Quartz glass

  3 Flint glass

  4 Pyrex glass

    Ans: 1

Q. Supersonic Jet causes pollution by thinning of

  1 CO2 layer

  2 O2 layer

  3 O3 layer

  4 SO2 layer

    Ans: 3

Q. Who invented penicillin?

  1 Louis Pasteur

  2 Alexander Fleming

  3 Dreser

  4 Edward Jenner

    Ans: 2

Q. The name of the white revolution is associated with

  1 Kurien Verghese

  2 C.Rangarajan

  3 M.S.Swaminathan

  4 J.V.Narlikar

    Ans: 1

Q. Scientists at the Tomato Genome Consortium (TGC) successfully sequenced the genomes of which of the following vegetables?

  1 Brinjal

  2 Onion

  3 Potato

  4 Tomato

    Ans: 4

Q. Venkataraman Ramakrishnan was jointly awarded Nobel Prize in Chemistry in the year 2009 for the:

  1 theory of electron transfer

  2 studies of the structure and function of the ribosome

  3 palladium catalysed cross couplings in organic synthesis

  4 work in the area of olefin metathesis

    Ans: 2

Q. Consider the following statements with regard to the renewable Energy Certificate (REC) Mechanism launched in November 2010 by the Government of India:1. It enables the obligated entities to meet their renewable purchase obligation.2. It is one of the pioneering efforts in any developing country for mainstreaming the renewable energy generation through market mechanism.Which of the statements given above is/are correct?

  1 1 only

  2 2 only

  3 Both 1 and 2

  4 Neither 1 nor 2

    Ans: 3

Q. Atomic Power Station is located in which of the following places in India?

  1 Kalpakkam

  2 Allahabad

  3 Pune

  4 Shimla

    Ans: 1

Q. Solar energy is due to

  1 fission reactions

  2 combustion reactions

  3 chemical reactions

  4 fusion reactions

    Ans: 4

Q. Which of the following branches deals with the interactions of same species of living organisms with their non-living environment?

  1 Synecology

  2 Ecology

  3 Palaeontology

  4 Autecology

    Ans: 2

Q. A non-conventional source of power is—

  1 Solar Power

  2 Coal

  3 Uranium

  4 Petroleum

    Ans: 1

Q. India's permanent Research Station 'Dakshin Gongotri' is located at -

  1 Indian Ocean

  2 Himalayas

  3 Arabian Sea

  4 Antarctica

    Ans: 4

Q. Chittaranjan in West Bengal is well known for its -

  1 Iron and Steel Industries

  2 Locomotive Works

  3 Cement Factory

  4 Fertilizer Plant

    Ans: 2

Q. Vulcanisation is the process of heating rubber with 3-5% of -

  1 Lime

  2 Sulphur

  3 Naphthalene

  4 Potassium permanganate

    Ans: 2

Q. Watson and Crick are famous for their discovery of -

  1 Antibodies

  2 Structure of DNA

  3 Vaccinia

  4 Life history of Plasmodium Vivax

    Ans: 2

Q. Dimension of gravitational constant is -

  1 gm cm-3 sec-2

  2 cm sec-3 gm-2

  3 cm4 sec-1 gm-2

  4 cm3 sec-2 gm-1

    Ans: 4

Q. The nuclear reaction involved in a nuclear reactor is--

  1 Fusion

  2 Fission

  3 Spallation

  4 Neutron absorption

    Ans: 1

Q. The scientist associated with the success of Green Revolution is

  1 Norman Borlaug

  2 V.R. Rao

  3 J.C. Bose

  4 S.S. Bhatnagar

    Ans: 1

Q. The first-ever robot spacecraft to probe planet Venus was named

  1 Magellan

  2 Galileo

  3 challenger

  4 Newton

    Ans: 1

Q. Venkataraman Ramakrishnan was jointly awarded Nobel Prize in Chemistry in the year 2009 for the:

  1 studies of the structure and function of the ribosome

  2 theory of election transfer.

  3 palladium catalyzed cross couplings in organic synthesis.

  4 work in the area of ole fin metathesis.

    Ans: 1

Q. Heavy Water is normally used by which of the following industries?

  1 Pharma Industry

  2 Paper Industry

  3 Nuclear Power generation plants

  4 Sugar plants

    Ans: 3

Q. Which one of the following is a spacecraft?

  1 Spitzer

  2 Cassini

  3 Apophis

  4 TecSar

    Ans: 2

Q. Norman Ernest Borlaug, who is regarded as the father of the Green revolution in India, is from which country?

  1 New Zealand

  2 USA

  3 Mexico

  4 Australia

    Ans: 2

Q. World Environment Day is Celebrated Every Year on

  1 January 15

  2 August 26

  3 June 5

  4 July 10

    Ans: 3

Q. RDX is a

  1 An instrument to measure blood pressure

  2 A gene

  3 A chemical used in the manufacture of fertilizers

  4 An explosive

    Ans: 4

Q. Centre for DNA Fingerprinting is located at

  1 Bengaluru

  2 New Delhi

  3 Pune

  4 Hyderabad

    Ans: 4

Q. NASA's new space telescope is-

  1 Wise

  2 Rise

  3 Barack

  4 Telle

    Ans: 1

Q. The Idea of motion pictures was propounded by-

  1 N.R. Finsen

  2 T. A. Edison

  3 J.L. Baird

  4 Berliner

    Ans: 3

Q. The device used for locating submerged object sunder sea is-

  1 Sonar

  2 Radar

  3 Laser

  4 Maser

    Ans: 1

Q. The branch of study dealing with old age and aging is called-

  1 Oncology

  2 Gerentology

  3 Teratology

  4 Ornithology

    Ans: 2

Q. In July 2010' ISRO used the vehicle for Launching 5 Satellites-

  1 GSLV

  2 PSLV

  3 ESLV

  4 SLV

    Ans: 2

Q. "Green House Effect" means

  1 Pollution in houses in tropical regions

  2 Trapping of solar energy due to atmospheric oxygen

  3 Trapping of Solar energy due to atmospheric carbon dioxide

  4 Cultivation in green houses so as to check pollution

    Ans: 3

Q. Which one of the following scientists has carried out researches both in the field of biology and physics?

  1 Jagdish Chandra Bose

  2 Har Govind Khorana

  3 C. V. Raman

  4 Homi J. Bhabha

    Ans: 1

Q. 2, 4-d is-

  1 an insecticide

  2 an explosive

  3 a fungicide

  4 a herbicide

    Ans: 4

Q. Nobel Alfred Bernhard after whom Nobe prizes are given was

  1 Engineer

  2 Chemist

  3 Both (A) & (B)

  4 Doctor

    Ans: 3

Q. India's first remote sensing satellite (IRS 1A) was launched from

  1 Baikonour

  2 Cape Kennedy

  3 French Guiana

  4 Sri Harikota

    Ans: 1

Q. Theorphrastus is called the father of

  1 Botany

  2 Zoology

  3 Anatomy

  4 Astrology

    Ans: 1

Q. Uranium Corporation of India is located in

  1 Mumbai

  2 Delhi

  3 Thiruvananthapuram

  4 Jadugoda

    Ans: 1

Q. The resources which can be used continuously, year-after-year are called

  1 Biotic

  2 Abiotic

  3 Non-renewable

  4 Renewable

    Ans: 4

Q. Television broadcast for rural development programmes in India started in-

  1 1947

  2 1957

  3 1967

  4 1977

    Ans: 4

Q. Radioactive element which has been found to have large reserves in India is

  1 Uranium

  2 Thorium

  3 Radium

  4 Plutonium

    Ans: 2

Q. "Astra" which was in news in recent past is the name of a newly developed-

  1 Air-to-air Missile

  2 Battle Tank

  3 Spy Rocket

  4 Submarine

    Ans: 1

Q. Which of the following is the short from of the name of the Indian Space Shuttle which puts various satellites into orbit?

  1 RISAT

  2 PSLV

  3 ANUSAT

  4 ISRO

    Ans: 2

Q. The study which deals with secret writing is known as

  1 Cryptography

  2 Secretology

  3 Cytography

  4 Cryptology

    Ans: 4

Q. Acupuncture is widely practised in

  1 India

  2 America

  3 China

  4 Germany

    Ans: 3

Q. Non-conventional source of energy best suited for India is

  1 Solar energy

  2 Wind energy

  3 Tidal wave energy

  4 Nuclear energy

    Ans: 1

Q. The magnetic effect of electric current was first observed by

  1 Henry

  2 Oersted

  3 Faraday

  4 Volta

    Ans: 2

Q. In 2010, China became the third country in the world to possess an anti satellite weapon system. The other two countries are

  1 Germany and Russia

  2 France and the USA

  3 The USA and Germany

  4 The USA and Russia

    Ans: 4

Q. The acronym STD written on Telephone booth stands for

  1 Straight Telephone Dial

  2 Switch Telephone Dial

  3 Subscriber Telephone Dialing

  4 Save Telephone Dialing

    Ans: 3

Q. Humidity is measured by which of the following instrument?

  1 Barometer

  2 Thermometer

  3 Hygrometer

  4 Hydrometer

    Ans: 3

Q. Which of the following is not a missile tested in Indian Missile Programme?

  1 Agni

  2 Trishul

  3 Prithvi

  4 Arjun

    Ans: 4

Q. Refrigerators keep food unspoiled because

  1 At its low temperature, bacteria and moulds are inactive

  2 At its low temperature, the germs are killed

  3 At its low temperature, the germs are frozen

  4 It sterilises the food

    Ans: 1

Q. Water boils at a lower temperature on the hills because

  1 It is cold on the hills

  2 There is less carbon dioxide on the hills

  3 There is a decrease in air pressure on the hills

  4 there is less oxygen

    Ans: 3

Q. The resources which can be used continuously, year-after-year are called

  1 Biotic

  2 Abiotic

  3 Non-renewable

  4 renewable

    Ans: 4

Q. Who Gave the First Evidence of the Big-Bang Theory?

  1 Edwin Hubble

  2 Albert Einstein

  3 S. Chandrashekhar

  4 Stephen Hawking

    Ans: 1

Q. With reference to Indian Defence. Which of the statements is NOT correct?

  1With the induction of Prithvi-II, the IAF is the only air force in the world with surface-to-surface ballistic missiles under its command

  2 Sukhoi-30 MKI jet fighters can launch air-to-air and air-to-surface precision missiles

  3 Trishul is a supersonic surface-to-air missile with a range of 30 km

  4 The indigenously built INS Prabal can launch surface-to-surface missiles

    Ans: 4

Q. An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration. The free surface of oil then

  1 Remains horizontal

  2 Is inclined to the horizontal with smaller depth at the rear end

  3 is inclined to the horizontal with larger depth at the rear end

  4 Assumes parabolic curve

    Ans: 3

Q. Consider the following statement: 1. India launched its first full fledged meteorological

satellite (METSAT) in September 2002. 2. For the first time, the space vehicle PSLV-C4 carried a payload of more than 1000kg into a geosynchronous orbit. Which of these statement is/are correct?

  1 Only 1.

  2 Only 2.

  3 Both 1 & 2

  4 Neither 1 nor 2

    Ans: 3

Q. Pokharan II took place on

  1 May 9, 1998

  2 May 10, 1998

  3 May 11, 1998

  4 May 12, 1998

    Ans: 3

Q. The deepest location on the earth's surface on record is about 11.034 km beneath the sea level. It is located in -

  1 Izu Ogasawara Trench, West Pacific Ocean

  2 Yap trench, Pacific Ocean

  3 Mid Oceanic Ridge, Atlantic Ocean

  4 Marina Trench, west Pacific Ocean

    Ans: 4

Q. The smallest functional and structural unit of kidney is called as -

  1 Neuron

  2 Nephron

  3 Granulocyte

  4 Reticulocyte

    Ans: 2

Q. Ozone hole was first been discovered in 1980s, by the British scientist over -

  1 Artic region

  2 Polar region

  3 Antarctica

  4 Tropical region

    Ans: 3

Q. The scientific name of Indian Tiger is -

  1 Panthera tigris

  2 Panthera pardus

  3 Felis tigris

  4 Felis chaus

    Ans: 1

Q. German Silver is an alloy of -

  1 Silver, Copper and Carbon

  2 Copper, Zinc and Nickel

  3 Silver, Zinc and Cobalt

  4 Aluminium, Zinc and Nickel

    Ans: 2

Q. Chinese researches have recently discovered the fossils of a flying dinosaur with four wings, which can be an important missing link in the evolution of dinosaurs. It is named as-

  1 Tyrannosaurus rex

  2 Tyrannosaurus knowlesi

  3 Archeopteryx

  4 Anchiornis huxleyi

    Ans: 4

Q. Which of the following antibiotic drug used extensively to treat cattle in India is found to be the main culprint of vanishing 99% population of India vultures -

  1 Diclofenac

  2 Penicillin

  3 Streptomycin

  4 Tetracycline

    Ans: 1

Q. Recently British scientists have identified the enzyme that plays crucial role in clogging cup of arteries. It is called -

  1 Peroxidase

  2 Matrix metalloproteinase - 8

  3 Succinic dehydragenase

  4 Elastase - 1

    Ans: 2

Q. What is clickjacking?

  1 A malicious techique of tricking web users into revealing confidential information

  2 A device that sends and receivers data in a bit second

  3 A form of computer engineering

  4 A digital process that in used to display an image on the monitor

    Ans: 1

Q. Which of the following diseases is caused by the consumption of nitrate contaminated food and water?

  1 Minamata disease

  2 Osteoporosis

  3 Asbestosis

  4 Blue baby syndrome

    Ans: 4

Q. Grantham Prize is constituted to felicitate the journalists working in the area of

  1 Physics

  2 Information Technology

  3 Environment

  4 Medicine

    Ans: 3

Q. Which of the following falls in the category of endangered species under the Red Data list of IUCN?

  1 Albatross

  2 Crowned solitary eagle

  3 Snow Leopard

  4 All of the above

    Ans: 4

Q. PSLV-C14 in its latest space quest had carried Oceasat-2 with how many foreign nano satellites

  1 9

  2 7

  3 6

  4 5

    Ans: 3

Q. Which of the following subtype of Ultraviolet (UV) rays is 100% penetrable through the Ozone Layer?

  1 UV-A

  2 UV-B

  3 UV-C

  4 None of the above

    Ans: 1

Q. Which of the following indigenously built payload carried on board with Chandrayaan - I helped NASA's Moon Mineralogy Mapper (M3) to detect water on moon surface is

  1 Hyper Spectral Imager (HySI)

  2 X-Ray spectrometer

  3 Sus-KeV atom reflecting analyser

  4 Radiation Dose Monitor

    Ans: 1

Q. The most commonly used chemicals for the "artificial rainmaking' or clod seeding are

  1 Silver Iodine (AgI)

  2 Sodium Cloride (NaCl)

  3 Dry Ice (Frozen CO2)

  4 All of the above

    Ans: 4

Q. International Renewable Energy Agency (IRENA) is presently headed by

  1 Helene Pelosse

  2 G. Vishwanathan

  3 Lars Rasmussen

  4 Peter Roebuck

    Ans: 1

Q. What is the source of electric energy in an artificial satellite?

  1 A mini nuclear reactor

  2 A dynamo

  3 A thermopile

  4 Solar cells

    Ans: 4

Q. In which district of Uttar Pradesh has solar energy plant been started?

  1 Agra

  2 Aligarh

  3 Mathura

  4 Etah

    Ans: 2

Q. In which city is the International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI) located ?

  1 Mumbai

  2 Bengaluru

  3 Chennai

  4 Hyderabad

    Ans: 4

Q. Which one of the following scientists was not associated with the wheat hybridization programme in India?

  1 M. S. Swaminathan

  2 Panchanan Maheshwari

  3 Choudhary Ram Dhan Singh

  4 Norman E. Borlaug

    Ans: 4

Q. Who of the following won the Nobel Prize for his work on Photoelectric effect

  1 Albert Einstein

  2 Werner Heisenberg

  3 Steven Weinberg

  4 Max Planck

    Ans: 1

Q. 'Rosatom' is the atomic energy agency of -

  1 Canada

  2 France

  3 Britain

  4 Germany

    Ans: 4

Q. Solar-B satellite to study the sun has been launched by

  1 Japan

  2 China

  3 Russia

  4 America

    Ans: 1

Q. The Multi-Lingual Natural Disaster Information System (NDIS) has been developed by

  1 Geneva Software Technologies Ltd. (GSTL)

  2 Infosys

  3 Wipro

  4 Microsoft

    Ans: 1

Q. The branch of physiology and medicine concerned with heart is known as

  1 Cytogenetics

  2 Geriatrics

  3 Haematology

  4 Cardiology

    Ans: 4

Q. When a green leaf is seen in red light, its colour will be

  1 Green

  2 Red

  3 Black

  4 Brown

    Ans: 3

Q. Study of life in outer space is

  1 Endobiology

  2 Entrobiology

  3 Neobiology

  4 Exobiology

    Ans: 4

Q. Which one of the following was to be discovered first in the chromosphere of the sun

  1 Helium

  2 Neon

  3 Xenon

  4 Krypton

    Ans: 1

Q. Which one of the following pairs is correctly matched

  1 X-Ray : Roentgen

  2 Mass energy relation : Faraday

  3 Microscope : Galilio

  4 Law of electrolysis : Edward Jenner

    Ans: 1

Q. When a magnetic needle is placed at a neutral point, it turns

  1 Vertical

  2 Horizontal

  3 At an angle greater than 900

  4 At an angle smaller than 900

    Ans: 1

Q. If a cloth is coated with a resin then the angle of contact between the cloth and water

  1 Increases

  2 Decreases

  3 Remains same

  4 Becomes zero

    Ans: 1

Q. The best colours for a Sun umbrella will be -

  1 white on top and black on inside

  2 red on top and black on inside

  3 black on top and white on inside

  4 black on top and red on inside

    Ans: 1

Q. Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because -

  1 barium is a good absorber of X-rays and helps stomach to appear clearly

  2 barium salts are white in colour and this helps stomach to appear clearly

  3 barium allows X-rays to pass through the stomach

  4 barium salts are easily available

    Ans: 1

Q. In SONAR, we use -

  1 radio waves

  2 audible sound waves

  3 infrasonic waves

  4 ultrasonic waves

    Ans: 4

Q. A liquid is kept in a regular cylindrical vessel up to a certain height. If this vessel is replaced by another cylindrical vessel having half the area of cross-section of the bottom, the pressure on the bottom will -

  1 be increased to twice the earlier pressure

  2 be reduced to one-fourth the earlier pressure

  3 remain unaffected

  4 be reduced to half the earlier pressure

    Ans: 1

Q. The time period of a simple pendulum having a spherical wooden bob is 2 second. If the bob is replaced by a metallic one twice as heavy, the time period will be -

  1 more than 2 second

  2 1 second

  3 2 second

  4 less than 1 second

    Ans: 3

Q. Which one among the following statements about an atom is not correct?

  1 Atoms are the basic units from which molecules and ions are formed

  2 Atoms always combine to form molecules

  3 Atoms aggregate in large numbers to form the matter that we can see, feel and touch

  4 Atoms are always neutral in nature

    Ans: 3

Q. The working principle of a washing machine is -

  1 Dialysis

  2 Centrifugation

  3 Reverse osmosis

  4 Diffusion

    Ans: 2

Q. A spherical ball made of steel when dropped in mercury container will

  1 sink in mercury

  2 will be on the surface of mercury

  3 will be partly immersed in mercury

  4 will dissolve in mercury

    Ans: 3

Q. The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as

  1 Ultrasonics

  2 Audible sounds

  3 Infrasonics

  4 Megasonics

    Ans: 2

Q. Pure water is bad conductor of electricity because it is

  1 not volatile

  2 feebly ionized

  3 a non-polar solvent

  4 a very good solvent

    Ans: 2

Q. The metals commonly used for electroplating are

  1 Gold, Sodium & Chromium

  2 Chromium, Copper & Nickel

  3 Nickel, Lead & Chromium

  4 Gold, Sodium & Potassium

    Ans: 2

Q. Gamma rays have greatest similarity with

  1 a-rays

  2 b-rays

  3 X-rays

  4 U.V.rays

    Ans: 3

Q. Two 220 V, 60 W bulbs are used for 5 hours a day for 10 days. If each unit (1 kilowatt hour) costs Rs. 3.50, find the total expense for it -

  1 Rs. 10.50

  2 Rs. 38.50

  3 Rs. 77.00

  4 Rs. 21.00

    Ans: 4

Q. There are four statements gives below explaining why mercury is chosen as a thermometric liquid. which of these statements is wrong?

  1 Volume of mercury increases equally for equal rises of temperature

  2 Mercury is a good conductor of heat

  3 Mercury does not stick to glass

  4 Mercury has a large specific heat

    Ans: 1

Q. The internal energy of a body means -

  1 Sum total of its kinetic and potential energy of its constituent molecules.

  2 its kinetic energy

  3 Total kinetic energy of its constituent moleules

  4 Sum total of its kinetic and potential energy

    Ans: 1

Q. Which of the following is a dimensionless quantity?

  1 Acceleration

  2 Volume

  3 Refractive Index

  4 Kinetic energy

    Ans: 3

Q. Four wires of same material and different dimensions are stretched under the equal weight, which one will suffer greater elongation? The dimensions are given below -

  1 Length 100 cm, diameter 1 mm

  2 Length 200 cm, diameter 2 mm

  3 Length 300 cm, diameter 3 mm

  4 Length 400 cm, diameter 0.5 mm

    Ans: 4

Q. Water is used in hot water bags because

  1 it is easily obtained

  2 it has high specific heat

  3 it is cheaper and is not harmful

  4 it is easy to heat water

    Ans: 2

Q. Water drops cannot stick to the oily surface due to

  1 surface tension

  2 lack of adhesive force

  3 water is lighter than oil

  4 cannot mix each other

    Ans: 2

Q. Energy in reflected light

  1 does not depends on the angle of incidence

  2 decreases with the increase in angle of incidence

  3 increases with the increase in angle of incidence

  4 becomes maximum for angle of incidence equal to 45 degree

    Ans: 1

Q. The unit of power is called -

  1 Watt

  2 Dyne

  3 Erg

  4 Ohm

    Ans: 1

Q. The sound produced by a bat is -

  1 Ultrasonic

  2 Infrasonic

  3 Audible

  4 Subsonic

    Ans: 1

Q. When a bar magnet is cut into two equal halves, the pole strength of each piece -

  1 Becomes zero

  2 Remains the same

  3 Becomes Half

  4 Becomes Double

    Ans: 2

Q. In a refrigerator, cooling is produced by

  1 the evaporation of a volatile liquid

  2 the sudden expansion of a compressed gas

  3 the ice which deposits on the freezer

  4 None of the above

    Ans: 1

Q. Which principle states that when a body is partially or totally immersed in a fluid, it experiences an upward thrust equal to the weight of fluid displaced by it:

  1 Archimedes'

  2 Hooke's

  3 Pascal's

  4 Newton's

    Ans: 1

Q. Cream gets separated from milk when it is churned because of:

  1 Gravitational force

  2 Centrifugal force

  3 Frictional force

  4 Cohesive force

    Ans: 2

Q. Speed of sound is maximum in:

  1 Gas

  2 Same in all cases

  3 Liquid

  4 Solid

    Ans: 4

Q. Newton is a unit of:

  1 Force

  2 Acceleration

  3 Work

  4 Energy

    Ans: 1

Q. The mass of a body at the centre of earth is:

  1 Zero

  2 Remains constant

  3 More than at the surface

  4 Less than at the surface

    Ans: 2

Q. 1 Joule is equivalent to

  1 103ergs

  2 105 ergs

  3 107ergs

  4 1011

    Ans: 3

Q. The coating of a thin layer of zinc on steel or iron objects is known as

  1 Galvanising

  2 Hot dipping

  3 Tinning

  4 Electroplating

    Ans: 1

Q. Electric current in a metal wire is due to the flow of

  1 Protons

  2 Electrons

  3 Ions

  4 None of these

    Ans: 2

Q. Optic fibres are mainly used for

  1 Weaving

  2 Communication

  3 Musical instruments

  4 Food industry

    Ans: 2

Q. Which among the following is a chemical change?

  1 A wet towel dries in the sun

  2 Lemon juice added to tea causing its colour to change

  3 Coffee is brewed by passing steam through ground coffee

  4 Hot air rises over a radiator

    Ans: 2

Q. Which of the following is a vector quantity?

  1 Force

  2 Temperature

  3 Energy

  4 Momentum

    Ans: 1

Q. At what point the Centigrade and the Fahrenheit temperatures are the same?

  1 10 degree

  2 0 degree

  3 -10 degree

  4 -40 degree

    Ans: 4

Q. Which among the following is an element?

  1 Alumina

  2 Brass

  3 Graphite

  4 Silica

    Ans: 3

Q. In lathe machine, taper turning can be done by

  1 Set over arrangement

  2 Taper turning attachment

  3 Swiveling compound rest

  4 All of the above

    Ans: 4

Q. In electro discharge machining, cutting tools are usually made of

  1 High speed steel

  2 Tool steel

  3 Carbide-tipped tool

  4 Graphite

    Ans: 4

Q. Glass is made of

  1 Sand & Silicate

  2 Quartz & Mica

  3 Sand & Silt

  4 None of these

    Ans: 2

Q. Which of the following is called strategic metal?

  1 Silicon

  2 Titanium

  3 Uranium

  4 Germanium

    Ans: 3

Q. Heavy water is

  1 Sea water(H2O + salt)

  2 D2O2

  3 H2O2

  4 None of the above

    Ans: 2

Q. The operation of threading a drilled hole is called

  1 Tapping

  2 Broaching

  3 Lapping

  4 Reaming

    Ans: 1

Q. The first symbol in a grinding wheel code is the

  1 Bond Type

  2 Grain size

  3 Structure

  4 Abrasive Type

    Ans: 4

Q. Thermit welding is a form of

  1 Gas welding

  2 Fusion welding

  3 Resistance welding

  4 Arc welding

    Ans: 2

Q. Electrode gets consumed in which type of welding process?

  1 Arc

  2 Thermit

  3 T.I.G.

  4 Gas

    Ans: 1

Q. Which of the following metals can be easily drawn into the wire?

  1 Lead

  2 Copper

  3 Tin

  4 Zinc

    Ans: 2

Q. Base of a transistor is

  1 Heavily doped

  2 Moderately doped

  3 Lightly doped

  4 None of the above

    Ans: 4

Q. Lube oil is used in diesel engines

  1 To ignite

  2 To cool the engine

  3 To reduce friction

  4 2 and 3 both

    Ans: 4

Q. Air is charged in the cylinder of diesel engine by

  1 Exhaust valve

  2 Inlet valve

  3 Injector

  4 Air Box

    Ans: 2

Q. Type of filter fitted in a tractor is

  1 Paper Type

  2 Cotton Type

  3 Oil-bath Type

  4 Wire Mesh Type

    Ans: 1

Q. Nichrome is commonly used for

  1 Transformer windings

  2 Battery connetions

  3 Lamp filament

  4 Heater coils

    Ans: 4

Q. For a flexible cable, most suitable insulation is

  1 Glass fibre

  2 Magnesium oxide

  3 Polyvenyl chloride

  4 Insulating tape

    Ans: 3

Q. Function of a carburator is

  1 To mix petrol with air

  2 To supply petrol to the engine

  3 To purify the air

  4 To purify the petrol

    Ans: 1

Q. The supply which cannot pass through condensor

  1 Is DC supply

  2 Is 12 volt AC

  3 Is AC supply

  4 Depends on the type of circuit

    Ans: 3

Q. The terminal impedance of folded dipole television antenna is kept

  1 300 ohms

  2 75 ohms

  3 0 ohm

  4 100 ohms

    Ans: 2

Q. The efficiency of an air-conditioning plant is expressed by

  1 Percentage

  2 Temperature

  3 C.P.O.

  4 Tonnes

    Ans: 4

Q. A plug guage is used to measure the

  1 Pitch of thread

  2 Bores of cyclinders

  3 Angles

  4 Flatness

    Ans: 2

Q. An optical gauge works on the principle of

  1 Interference of light

  2 Reflection

  3 Dispersion

  4 Polarisation

    Ans: 1

Q. A fluorescent tube contains

  1 Argon

  2 Nitrogen

  3 Neon

  4 Oxygen

    Ans: 3

Q. The feeding of a job in planner is done by

  1 Table movement

  2 Tool movement

  3 Ram movement

  4 Movement of a clapper box

    Ans: 4

Q. Which of the following machines utilises fly cutters?

  1 Planner

  2 Milling machine

  3 Lathe machine

  4 Shaper

    Ans: 2

Q. Crater wear takes place in single point cutting tool at

  1 Flank

  2 Rake

  3 Side

  4 Both Flank & Rake

    Ans: 4

Q. It is difficult to magnetise steel because of its

  1 Low permeability

  2 High retentivity

  3 High permeability

  4 High density

    Ans: 1

Q. In electric machines, laminated cores are used with a view to reduce the

  1 Friction loss

  2 Copper loss

  3 Eddy current loss

  4 Hysteresis loss

    Ans: 3

Q. In DC generators, the brushes are always placed

  1 Along the Geometric Neutral Axis (GNA)

  2 Along the Magnetic Neutral Axis (MNA)

  3 Perpendicular to MNA

  4 Perpendicular to GNA

    Ans: 2

Q. Critical resistance of a DC generator RC is

  1 Inversely proportional to speed

  2 Proportional to speed

  3 Inversely proportional to the square of speed

  4 Proportional to the square of speed

    Ans: 1

Q. If the current and the voltage are out of phase by 90 degree, then the power is

  1 Minimum

  2 Maximum

  3 1.1 VI

  4 Zero

    Ans: 4

Q. Megger is an instrument to measure

  1 Very low resistance

  2 Insulation resistance

  3 Q of a coil

  4 Inductance of a coil

    Ans: 2

Q. The forward resistance of a diode is

  1 Zero

  2 Infinity

  3 Very small

  4 Very large

    Ans: 1

Q. For lubricating roller bearing, lubricant generally required is

  1 Semi-solid

  2 Solid

  3 Liquid

  4 None of the above

    Ans: 1

Q. Which type of reaction produces the most harmful radiation?

  1 Fusion reaction

  2 Chemical reaction

  3 Fission reaction

  4 Photo-Chemical reaction

    Ans: 3

Q. The velocity of sound is maximum in -

  1 Vacuum

  2 Metal

  3 Liquid

  4 Air

    Ans: 2

Q. When you pull out the plug connected to an electrical appliance, you often observe a spark. To which property of the appliance, is this related?

  1 Capacitance

  2 Resistance

  3 Inductance

  4 Wattage

    Ans: 1

Q. The focal length of a convex lens is

  1 shorter for blue light than for red

  2 the same for all colours

  3 shorter for red light than for blue

  4 maximum for yellow light

    Ans: 1

Q. When a ball drops on to the floor it bounces. Why does it bounce?

  1 The floor heats up on impact

  2 Newton's third law implies that for every action there is a reaction

  3 File floor exerts a force on the ball during the impact

  4 The floor is perfectly rigid

    Ans: 2

Q. A body has a mass of 6 kg on the Earth; when measured on the Moon, its mass would be

  1 nearly 1 kg

  2 6 kg

  3 less than 1 kg

  4 less than 6 kg

    Ans: 2

Q. Transformer is a kind of appliance that can 1. increase power 2. increase voltage 3. decrease voltage 4. measure current and voltage Select the correct answer using the code given below:

  1 2 and 3 only

  2 1 and 4

  3 4 only

  4 2, 3 and 4

    Ans: 1

Q. Which of the following is used for correcting myopic eyes?

  1 Convex Lens

  2 Concave Lens

  3 Cylindrical Lens

  4 None of the above

    Ans: 2

Q. The sky appears blue due to-

  1 Scattering of light

  2 Reflection of light

  3 Refraction of light

  4 Diffraction of light

    Ans: 1

Q. Decibel unit is used to measure-

  1 Light intensity

  2 Sound intensity

  3 Magnitude of Earthquake

  4 None of the above

    Ans: 2

Q. What does an air conditioner installed in a room control?

  1 Humidity and temperature only

  2 Temperature only

  3 Pressure and temperature only

  4 Humidity, pressure and temperature

    Ans: 1

Q. The minimum height of a plane mirror to see the full image of a person is equal to-

  1 the height of the person

  2 half the height of the person

  3 one-fourth the height of the person

  4 double the height of the person

    Ans: 2

Q. Which one among the following will you put in to pure water in order to pass electric current through it?

  1 Mustard oil

  2 Sugar

  3 Lemon Juice

  4 Kerosene

    Ans: 3

Q. In the case of nuclear disaster, which of the following options for cooling the nuclear reactors may be adopted?1. Pumping of water to the reactors.2. Use of boric acid.3. Taking out the fuel rods and keeping them in a cooling pond.Select the correct answer using the code given below:

  1 1 and 2 only

  2 1, 2 and 3

  3 1 and 3 only

  4 3 only

    Ans: 1

Q. A close bottle containing water at room temperature is taken to the Moon and than the lid is opened. The water will

  1 boil

  2 freeze

  3 decompose into oxygen and hydrogen

  4 not change at all

    Ans: 1

Q. The blackboard seems black because it

  1 does not reflect any colour

  2 reflects every colour

  3 absorbs black colour

  4 reflects black colour

    Ans: 1

Q. A body is charged negatively. It implies that

  1 it has lost some of its protons

  2 it has lost some of its electrons

  3 it has acquired some electrons from outside

  4 None of these

    Ans: 3

Q. A devastating Cloud Burst swept over Leh in August 2010. Which one of the following statements with regard to cloud Burst is not correct?

  1 There is no satisfactory technique till now for predicting Cloud Burst

  2Cloud Burst is a localised weather phenomenon representing highly concentrated rainfall over a small area in a short duration of time

  3Cloud Burst occurs due to upward movement of moistureladen air with sufficient rapidity to form cumulonimbus clouds

  4 Cloud Burst occurs only in hilly areas

    Ans: 1

Q. In scuba-diving, while ascending towards the water surface, there is a danger of bursting the lungs. It is because of

  1 Boyle's law

  2 Archimedes' principle

  3 Gay-Lussac's law of combining volumes

  4 Gram's law of diffusion

    Ans: 1

Q. Most of the communication satellites today are placed in a geostationary orbit. In order to stay over the same spot on the Earth, a geostationary satellite has to be directly above the

  1 Equator

  2 Tropic of Cancer

  3 either North or South Pole

  4 Tropic of Capricorn

    Ans: 1

Q. Viewfinders, used in automobiles to locate the position of the vehicles behind, are made of

  1 convex mirror

  2 plane mirror

  3 concave mirror

  4 parabolic mirror

    Ans: 1

Q. Why do you feel cool under a tree but not so under a tin shed on a sunny day?

  1 The leaves give out water which vapourises absorbing some heat as latent heat

  2 The greenness of the tree gives the cool feeling

  3 Photosynthesis absorbs heat

  4 The leaves convert water vapours into water which is a heat-absorbing process

    Ans: 1

Q. Which one among the following would expand the most on being heated?

  1 Air

  2 Water

  3 Alcohol

  4 Glass

    Ans: 1

Q. If a ship moves from freshwater into seawater, it will

  1 rise a little higher

  2 sink completely

  3 sink a little bit

  4 remain unaffected

    Ans: 1

Q. Mr.X was advised by an architect to make outer walls of his house with hollow bricks. The correct reason is that such walls

  1 help keeping inside cooler in summer and warmer in winter

  2 make the building stronger

  3 prevent seepage of moisture from outside

  4 protect the building from lightning

    Ans: 1

Q. Water is a good coolant and is used to cool the engines of cars, buses, trucks, etc. It is because water has a

  1 high specific heat

  2 low surface tension

  3 high boiling point

  4 low expansivity

    Ans: 1

Q. Half portion of a rectangular piece of ice is wrapped with a whit piece of cloth while the other half with a black one. In this context, which one among the following statements is correct?

  1 Ice melts more easily under black wrap

  2 Ice melts more easily under white wrap

  3 No ice melts at all under the black wrap

  4 No ice melts at all under white wrap

    Ans: 1

Q. Which one among the following statements is correct?

  1 Concave mirrors are used as reflectors

  2 Convex mirrors are used by doctors to examine oral cavity

  3 Convex mirrors are used as reflectors

  4 Convex mirrors should be used as shaving

    Ans: 1

Q. Which one among the following is the major cause of blurring and unsharp images of objects observed through very large telescope at the extreme limit of magnification?

  1 Air turbulence of earth's atmosphere

  2 Poor optical polish achievable on large mirrors

  3 Poor tracking capacities of telescopes

  4 Varying density of air in the Earth's atmosphere

    Ans: 1

Q. The material used for electric fuse is an alloy of tin and lead. This alloy should have:

  1 high specific resistance and low melting point.

  2 low specific resistance and high melting point.

  3 low specific resistance and low melting point.

  4 high specific resistance resistance and high melting point

    Ans: 1

Q. Light travels slower in glass than in air because:

  1 refractive index of air is less than that of glass.

  2 refractive index of air is greater than that of glass.

  3 density of glass is less than that of air

  4 density of glass is greater than that of air.

    Ans: 1

Q. A Jet engine works on the principle of Conservation of:

  1 linear momentum

  2 angular momentum

  3 energy

  4 mass

    Ans: 1

Q. A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a :

  1 converging lens

  2 diverging lens

  3 piano-converging lens

  4 piano-diverging lens

    Ans: 2

Q. In a pressure cooker cooking is faster because the increase in vapour pressure:

  1 increase the boiling point.

  2 increase the specific heat.

  3 decrease the specific heat.

  4 decrease the boiling point.

    Ans: 1

Q. Magnets attract magnetic substances such as iron, nickel, cobalt etc. They can also repel:

  1 paramagnetic substances

  2 ferromagnetic substances

  3 diamagnetic substances

  4 non-magnetic substances

    Ans: 3

Q. Which of the statements about glass are correct?1. Glass is a super-cooled liquid having infinite viscosity2. Violet coloured glass is obtained by adding MnO2

3. Glass is a man-made silicate4. Glass is a crystalline substanceSelect the correct answer using the code given below:

  1 1, 2 and 3

  2 1, 2 and 4

  3 2, 3 and 4

  4 1 and 3 only

    Ans: 1

Q. Sacrificial anode protects iron of ships, underground pipelines etc., from rusting, a process known as cathodic protection. Which one of the following metals cannot be used as a sacrificial anode?

  1 Tin

  2 Zinc

  3 Magnesium

  4 Aluminium

    Ans: 1

Q. Which one of the following types of waves are used in a night vision apparatus?

  1 Infra-red waves

  2 Radio waves

  3 Microwaves

  4 None of these

    Ans: 1

Q. When a light wave is reflected from a mirrior, there is a change in its

  1 velocity

  2 frequency

  3 wavelength

  4 amplitude

    Ans: 4

Q. In AC circuits, AC meters measure

  1 mean values

  2 peak values

  3 mean square values

  4 rms values

    Ans: 4

Q. Effect of increasing temperature on resistance of semiconductor is—

  1 Increasing

  2 No change

  3 Decreasing

  4 First increasing then decreasing

    Ans: 3

Q. If mass is increased by 2 times and velocity is increased by 3 times of a body then its momentum will be increased by —

  1 2 times

  2 3/2 times

  3 3 times

  4 6 times

    Ans: 4

Q. For what colour of light refractive index of glass is minimum?

  1 Yellow

  2 Red

  3 Blue

  4 Violet

    Ans: 2

Q. Newton’s laws of motion are valid in —

  1 Rotating frame of reference

  2 In all frame of reference

  3 Non-inertial frame of reference

  4 Inertial frame of reference

    Ans: 4

Q. Many elements have non-integral atomic masses because —

  1 Their isotopes have non-integral masses

  2 They have isotopes

  3 Their isotopes have different masses

  4 The constituents neutrons, protons and electrons combine to give fractional masses

    Ans: 1

Q. In which of the following processes of transmission of heat material medium is not required —

  1 Radiation

  2 Conduction

  3 Convection

  4 Conduction and convection

    Ans: 1

Q. At 4 degree C, volume of a certain mass of water is —

  1 Minimum

  2 Increased by 1/12th part of its volume at 0° C

  3 Maximum

  4 Remains same as the volume at 0° C

    Ans: 1

Q. Mach number is the ratio of —

  1 Velocity of sound and velocity of a body

  2 Velocity of two particles

  3 Velocity of a body and velocity of sound

  4 Frequency of two vibrating bodies

    Ans: 1

Q. X-ray is —

  1 Electromagnetic wave

  2 The flow of positive charge

  3 The flow of neutral practices

  4 The flow of electron

    Ans: 1

Q. The direction of vibration of practices with respect to wave direction in transverse wave is —

  1 30 degree

  2 45 degree

  3 Right angle

  4 Parallel

    Ans: 1

Q. The minimum distance between an object and its real image in a convex lens is -

  1 Less than 4f

  2 Equal to 2f

  3 Equal to 4f

  4 More than 4f

    Ans: 2

Q. Two copper wires A and B have the same weight and the radius of B is half that of A. The ratio Ra/Rb of their resistances is -

  1 1/8

  2 1/2

  3 1/16

  4 1/4

    Ans: 4

Q. A piece of metal plate with a circular hole is heated. If the metal plate expands on heating, the diameter of the hole will -

  1 Decrease

  2 Increase or decrease depending on the diameter of the hole

  3 Increase or decrease depending upon the material of the plate

  4 Increase

    Ans: 4

Q. The Phillips Curve shows the relation between -

  1 Income and price level

  2 Income and investment

  3 Inflation and unemployment

  4 Income and consumption

    Ans: 2

Q. Which metal is extracted from sea water?

  1 Magnesium

  2 Potassium

  3 Beryllium

  4 Aluminium

    Ans: 1

Q. The freezer in a refrigerator is fitted near the top

  1 it facilities convection currents

  2 to keep it away from hot compressor which is nearer to the bottom

  3 because of convenience

  4 to minimize power consumption

    Ans: 1

Q. The swing of a spinning cricket ball in air can be explained on the basis of

  1 Turbulence caused by wind

  2 sudden change in wind direction.

  3 Buoyancy of air.

  4 Bernoulli's theorem.

    Ans: 1

Q. When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because

  1 the retina retains the bright images for sometimes and becomes momentarily insensitive.

  2 the eye muscles cannot immediately adjust the focal length of the eye lens.

  3 the iris is unable to dilate the pupil immediately

  4 the iris is unable to contract the pupil immediately

    Ans: 1

Q. Which of the following is most elastic?

  1 Wet clay

  2 steel

  3 Plastic

  4 Rubber

    Ans: 2

Q. Which of the statements about glass are correct? 1. glass is a super-cooled liquid having infinite viscosity 2. violet coloured glass is obtained by adding MnO2 3. glass is a man-made silicate 4. glass is a crystalline substance select the correct answer using the code given below:

  1 1,2 and 3

  2 1,2 and 4

  3 2, 3 and 4

  4 1 and 3 only

    Ans: 1

Q. Which one among the following methods is not affective in removing arsenic from contaminated ground water?

  1 Reverse osmosis

  2 Boiling

  3 Ion exchange

  4 coagulation-adsorption

    Ans: 2

Q. Which of the following statements about diamond are correct? 1. It is used as a gem in jewellery because of its ability to reflect light 2. It is a good conductor of electricity 3. It is used for cutting glass, marble stones and other hard materials 4. It is used for drilling of rocks select the correct answer using the code given below:

  1 2 and 4 only

  2 1, 2 and 3

  3 2, 3 and 4

  4 1,3 and 4

    Ans: 4

Q. Which of the statements given below is/are correct? Permanent hardness of water is due to the presence of soluble: 1. chloride of calcium 2. bicarbonate of calcium 3. sulphate of magnesium 4. bicarbonate of magnesium select the correct answer using the code given below:

  1 1 and 3 only

  2 1, 2and 3

  3 2 and 4

  4 1 only

    Ans: 1

Q. Silver ware turns black after a period of time due to formation of:

  1 nitrate coating on silver

  2 oxide coating on silver

  3 chloride coating on silver

  4 sulphide coating on silver

    Ans: 4

Q. A student by chance mixed acetone with alcohol. This mixture of acetone and alcohol can be separated by:

  1 fractional distillation

  2 filtration

  3 separating funnel

  4 fractional crystallisation

    Ans: 1

Q. Iron nails are dipped into blue copper sulphate solution. After some time iron nails are:

  1 dissolved and blue colour is discharged

  2 not dissolved but blue colour is discharged

  3 dissolved but blue colour is not discharged

  4 not dissolved and blue colour is not discharged~

    Ans: 2

Q. A student heated some sulphur in a spatula and collected the gas 'X'. Which one among the following is correct about 'X'?

  1 X is SO2 and it turns moist litmus to red

  2 X is SO3 and it turns dry litmus to blue

  3 X is SO3 and it turns moist litmus to red

  4 X is SO2 and it turns moist litmus to blue

    Ans: 1

Q. Solutions in test tubes containing H2O and aqueous NaOH can be differentiated with the help of:

  1 blue litmus

  2 red litmus

  3 Na2CO3

  4 HCl (aqueous)

    Ans: 2

Q. Glass is actually:

  1 a crystalline solid.

  2 an ionic solid

  3 a vitrified liquid

  4 an elastic solid

    Ans: 3

Q. Which one among the following is the main ingredient in cement?

  1 Lime stone

  2 Gypsum

  3 Clay

  4 Ash

    Ans: 2

Q. When a ray of light is going from one medium to another, its:

  1 frequency remains same

  2 frequency increases

  3 wavelength increases

  4 wavelength remains same

    Ans: 1

Q. Magnets attract magnetic substances such as iron, nickel, cobalt etc. They can also repel:

  1 diamagnetic substances

  2 ferromagnetic substances

  3 paramagnetic substances

  4 non magnetic substances

    Ans: 1

Q. Mass of B is four times that of A. B moves with a velocity half that of A. Then B has:

  1 kinetic energy equal to that of A.

  2 half the kinetic energy of A.

  3 twice the kinetic energy of A.

  4 kinetic energy one-fourth of A

    Ans: 1

Q. A liquid rises to a certain length in a capillary tube. The tube is inclined to an angle of 45°. The length of the liquid column will:

  1 decrease

  2 increase

  3 first decrease and than increase

  4 remain unchanged

    Ans: 2

Q. Which one among the following is not a source of renewable energy?

  1 Fuel cell

  2 Solar energy

  3 Hydroelectricity

  4 Wind energy

    Ans: 1

Q. 'The stars seem to be higher on the sky than they actually are'. This can be explained by:

  1 diffraction of light

  2 atmospheric refraction

  3 total internal reflection

  4 dispersion of light

    Ans: 2

Q. If the electrical resistance of a typical substance suddenly drops to zero, then the substance is called:

  1 semiconductor

  2 super conductor

  3 conductor

  4 insulator

    Ans: 2

Q. The surface temperature of the Sun is nearly:

  1 2000K

  2 6000 K

  3 8000 K

  4 4000 K

    Ans: 2

Q. A Jet engine works on the principle of conversation of:

  1 linear momentum

  2 enrgy

  3 angular momentum

  4 mass

    Ans: 1

Q. The lines of force of a uniform magnetic field:

  1 must be divergent

  2 must be convergent

  3 must be parallel to teach other

  4 intersect

    Ans: 1

Q. Light travels slower in glass than in air because:

  1 density of glass is less than that of air

  2 density of glass is greater than that of air.

  3 refractive index of air is greater than that of glass.

  4 refractive index of air is less than that of glass.

    Ans: 4

Q. Suppose you are standing 1 m in front of a plane mirror. What should be the minimum vertical size of the mirror so that you can see your full image in it?

  1 twice your height

  2 2m

  3 0.50 m

  4 half of your height

    Ans: 4

Q. The material used for electric fuse is an alloy of tin and lead. This alloy should have:

  1 high specific resistance and high melting point

  2 low specific resistance and low melting point

  3 low specific resistance and high melting point

  4 high specific resistance and low melting point

    Ans: 4

Q. When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained by:

  1 the theory of relativity

  2 Newton's third law

  3 Newton's second law

  4 Newton's first law

    Ans: 4

Q. Bats can ascertain distances, directions, nature and size of the obstacles at night. This is

possible by reflection of the emitted:

  1 supersonic waves from the distant object

  2 supersonic waves from the bat

  3 ultrasonic waves from the distant objects

  4 ultrasonic waves from the bat

    Ans: 4

Q. Which one among the following is the major cause of blurring and unsharp images of objects observed through very large telescope at the extreme limit of magnification?

  1 varying density of air in the Earth's atmosphere

  2 poor tracking capacities of telescopes

  3 poor optical polish achievable on large mirrors

  4 Air turbulence of earth's atmosphere

    Ans: 4

Q. A man is at rest in the middle of a horizontal plane of perfectly smooth surface of ice. He can move himself to the shore by making use of Newton's:

  1 Third law of motion

  2 First law of motion

  3 Second law of motion

  4 First, second and third laws of motion.

    Ans: 1

Q. Light travels in optical fiber irrespective of its shape because it is a device by which signals can be transferred from one location to another. It is based on the phenomenon of:

  1 total internal reflection of light

  2 diffraction of light

  3 polarization of light

  4 refraction of light

    Ans: 1

Q. Which one among the following statements is correct?

  1 Concave mirrors are used as reflectors

  2 Convex mirrors are used by doctors to examine oral cavity

  3 Convex mirrors are used as reflactors

  4 Convex mirrors should be used for shaving

    Ans: 1

Q. A jet plane files through air with a velocity of 2 Mach. While the velocity of sound is 332 m/s the air speed of the plane is:

  1 66.4 km/s

  2 166 m/s

  3 664 m/s

  4 332 m/s

    Ans: 3

Q. When milk is churned, the cream separates from it due to:

  1 Centrifugal forcce

  2 Frictional force

  3 Gravitational force

  4 Viscous forces

    Ans: 1

Q. The S.I.unit of electric charge is:

  1 coulomb

  2 ampere

  3 e.s.u

  4 kelvin

    Ans: 1

Q. Light beam which is highly directional is called:

  1 laser

  2 eraser

  3 maser

  4 grazer

    Ans: 1

Q. Moving electric charge produces:

  1 heat waves

  2 magnetic field

  3 light rays

  4 sound waves

    Ans: 2

Q. The blue colour of the water in the sea is due to

  1 Refraction of the blue light by the impurities in sea water.

  2 Reflection of blue sky by the sea water.

  3 Absorption of other colours except the blue colour by water molecules

  4 Scattering of blue light by water molecules

    Ans: 4

Q. Which of the following is not a unit of time?

  1 Light Year

  2 Nano Second

  3 Micro Second

  4 Second

    Ans: 1

Q. The device used to rectify farsightedness is

  1 Concave Lens

  2 Convex Lens

  3 Spherical Lens

  4 Plane Glass

    Ans: 2

Q. A glass tumbler containing ice shows droplets of water on the outer surface because

  1 The outer surface of the tumbler shows hygroscopic effect

  2The moisture in the air on coming in contact with the cold surface of the tumbler condenses in the form of droplets of water

  3 Water from inside oozes out through minute porous wall of the tumbler

  4 Both (A)and (C)

    Ans: 2

Q. Solar Cell Converts

  1 Light energy into heat energy

  2 Solar energy into electrical energy

  3 Solar energy into sound energy

  4 Osteology is the study of

    Ans: 2

Q. A pond of clear water appears less deep than it really is. This is due to

  1 Refraction

  2 Reflection

  3 The transparency of water

  4 Dispersion

    Ans: 1

Q. Dry Ice is

  1 Liquid Nitrogen

  2 Water Ice

  3 Solid Carbon dioxide

  4 Frozen Ethanol

    Ans: 3

Q. 'Raman effect' was used to develop-

  1 Cooling Glasses

  2 Space Craft

  3 Atom Bomb

  4 Detecting Scanners

    Ans: 1

Q. Ozone Layer Protects earth from-

  1 Meteriorites

  2 Cosmic and other radiations

  3 Harmful Gases

  4 Space Debris

    Ans: 2

Q. Lens System used in a microscope-

  1 Convex

  2 Concave

  3 Concave,Convex

  4 Plain lens

    Ans: 1

Q. Leaves look green, Because-

  1 Reflect All colours

  2 Absorb all Colours reflect Green

  3 No effect of light on leaves

  4 Absorb only green

    Ans: 2

Q. Ice Floats on Water Because-

  1 Ice is Filled With Air

  2 Ice less dense than Water

  3 Waters depth more than ice

  4 Ice more than water

    Ans: 2

Q. A Horizontal Demand curve is

  1 Relatively Elastic

  2 Perfectly Inelastic

  3 Perfectly Inelastic

  4 Of Unitary Elasticity

    Ans: 4

Q. The best material for the core of a transformer is

  1 stainless steel

  2 mild steel

  3 hard steel

  4 soft iron

    Ans: 4

Q. Which colour of light shows maximum deviation when passed through a prism?

  1 Red

  2 White

  3 Violet

  4 Green

    Ans: 3

Q. Food is readily cooked in a pressure cooker because

  1 Boiling occurs at high temperature

  2 Boiling occurs at low temperature

  3 Pressure remains constant

  4 The cooking material cannot come out

    Ans: 1

Q. Hydrogen has the tendency to gain one electron to acquire helium configuration. In this tendency, it resembles

  1 Alkali metals

  2 Inert gases

  3 Alkaline earth metals

  4 Halogens

    Ans: 4

Q. The ore of aluminium metal is

  1 Cuprite

  2 Galena

  3 Bauxite

  4 Zirconite

    Ans: 3

Q. Carbonmonoxide reacts with H2 at 300$dGC to form

  1 Ethane

  2 Methane

  3 Propane

  4 Ethylene

    Ans: 2

Q. The required DC voltage for arc welding is

  1 6 to 9 V

  2 50 to 60 V

  3 200 to 250 V

  4 90 to 100 V

    Ans: 3

Q. For a body floating in water, the apparent weight is equal to

  1 Actual weight of the body

  2 Zero

  3 Weight of the body minus weight of the liquid

  4 Weight of the body plus upward thrust

    Ans: 3

Q. Transfer of heat through horizontal movement of air is called

  1 Convection

  2 Advection

  3 Radiation

  4 Conduction

    Ans: 2

Q. Which metal is not used as electromagnet?

  1 Copper

  2 Iron

  3 Nickel

  4 Cobalt

    Ans: 1

Q. The primary colours are

  1 blue, green and red

  2 blue, yellow and red

  3 yellow, orange and red

  4 none of these

    Ans: 1

Q. Which of the following is the hardest metal?

  1 Gold

  2 Iron

  3 Platinum

  4 Tungsten

    Ans: 2

Q. Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be

  1 At a higher level in water

  2 At a higher level in alcohol

  3 At the same level in both

  4 Floating in water and sinking in alcohol

    Ans: 4

Q. After long periods of use, a gray spot develops on the inside of a bulb. This is because

  1 The tungsten filament evaporates and collects there

  2 The heat of the bulb scorches the glass at the top

  3 Dust inside the bulb condenses on the top

  4 Glass undergoes a change due to the heat

    Ans: 1

Q. The temperature which has the same reading on both Fahrenheit and Celsius scales is

  1 40°

  2 -40°

  3 -34°

  4 -140°

    Ans: 2

Q. Water boils at a lower temperature on the hills because

  1 it is cold on the hills

  2 there is less carbon dioxide on the hills

  3 there is a decrease in air pressure on the hills

  4 there is less oxygen

    Ans: 3

Q. An air-conditioning system regulates

  1 Temperature

  2 Humidity

  3 Air velocity

  4 All of these

    Ans: 3

Q. The force that causes a spring to eventually return to its normal length is called

  1 Potential force

  2 Gravitational force

  3 Spring force

  4 Restoring force

    Ans: 4

Q. Echoes are due to

  1 Refraction of sound waves

  2 Polarisation of sound waves

  3 Diffraction of sound waves

  4 Reflection of sound waves

    Ans: 4

Q. Two resistance of 3Ω and 6Ω respectively are connected to a battery of 18V in series. The current passing through the circuit is

  1 2A

  2 3A

  3 6A

  4 9A

    Ans: 1

Q. When the length of a pendulum in a clock is increased, then

  1 The period increases and the clock loses time

  2 The period increases and the clock gains time

  3 The period decreases and the clock gains time

  4 The period remains constant and the clock maintains correct time.

    Ans: 1

Q. Solder is an alloy of

  1 Brass and Copper

  2 Aluminum and Brass

  3 Aluminum and Zinc

  4 Tin and Lead

    Ans: 4

Q. 60° is equal to

  1 Π/3 radians

  2 2Π/3 radians

  3 3/Π radians

  4 3Π/2 radians

    Ans: 1

Q. The velocity ratio of a screw jack is

  1 2πl/p

  2 2πp/l

  3 2πpl

  4 2π/pl

    Ans: 1

Q. One complete set of positive and negative values of an alternating quantity is known as a

  1 Phase

  2 Time Period

  3 Frequency

  4 Cycle

    Ans: 4

Q. Which of the following is an example of class - I Lever?

  1 Pliers

  2 Nut Cracker

  3 Tongs

  4 All of the Above

    Ans: 1

Q. The special filters used to reduce pollutants from the exhaust of a car are called

  1 Water Jacket

  2 Exhaust Manifold

  3 Baffle plate

  4 Catalytic Converter

    Ans: 4

Q. If two electrically charged bodies are connected by a wire, then the electric current will not flow if

  1 Both have the same capacity

  2 Both have the same temperature

  3 Both have the same potential

  4 None of these

    Ans: 3

Q. The colour of light which travels through glass with the minimum speed is

  1 Red

  2 Yellow

  3 Green

  4 Violet

    Ans: 2

Q. The device used for converting A. C. from higher voltage to lower voltage or vice versa is called

  1 Transmitter

  2 Commutator

  3 Transformer

  4 Generator

    Ans: 3

Q. If the linear momentum of a particle is doubled, then its kinetic energy will be

  1 Doubled

  2 Quadrupled

  3 Halved

  4 None of these

    Ans: 2

Q. Watt-hour is the unit of

  1 Energy

  2 Power

  3 Potential

  4 Current

    Ans: 1

Q. Which device mixes air and petrol (gas) for the internal combination engine?

  1 Carburetor

  2 Choke

  3 Crankshaft

  4 Cylinder

    Ans: 4

Q. The black hole theory was discovered by

  1 S. Chandrashekhar

  2 Har Gobind Khorana

  3 C. V. Raman

  4 S. Ramanujan

    Ans: 1

Q. Transistors used in electronic equipments are mostly made of

  1 Silver

  2 Copper

  3 Silicon

  4 Carbon

    Ans: 3

Q. Which of the following is a unit of angle measurement?

  1 Hour

  2 Second

  3 Millimeter

  4 None of these

    Ans: 2

Q. Find the incorrect one

  1 Hertz is used to measure frequency.

  2 Kelvin is used to measure temperature.

  3 Bel is used to measure atmospheric pressure.

  4 ohm is used to measure electrical resistance.

    Ans: 3

Q. If the radius of the earth were to shrink by 1 %, its mass remaining the same, the value of 'g' on the earth's surface would

  1 increase by 0.5%

  2 increase by 2%

  3 decrease by 0.5%

  4 decrease by 2%

    Ans: 2

Q. Which of the statements is NOT correct?

  1 The velocity of sound in air increases with the increase of temperature

  2 The velocity of sound in air is independent of pressure

  3 The velocity of sound in air decreased as humidity increases

  4 The velocity of sound in air is not affected by the change in amplitude and frequency

    Ans: 3

Q. Diffusion of light in the atmosphere takes place due to

  1 Carbon dioxide

  2 Dust particles

  3 Helium

  4 Water vapours

    Ans: 2

Q. Consider the following statements: A 4-wheel vehicle moving a sharp circular path at high speed will 1. Overturn about its outer wheels 2. Overturn about its inner wheels 3. Skid outwards 4. Skid inwards Which of these statements are correct?

  1 1 & 3

  2 2 & 4

  3 2 & 3

  4 1 & 4

    Ans: 3

Q. The power of lens is - 2D. What is its focal length?

  1 2m

  2 0.5m

  3 1.0m

  4 0.5m

    Ans: 4

Q. X-rays comprise of:

  1 Electrons only

  2 Protons only

  3 Neutrons only

  4 Electromagnetic radiations

    Ans: 4

Q. Which one of the following is a vector?

  1 Kinetic energy

  2 Pressure

  3 Rate of change of momentum

  4 Density

    Ans: 3

Q. Which one of the following allotropes of carbon is used for cutting and drilling?

  1 Diamond

  2 Graphite

  3 Activated carbon

  4 Carbon black

    Ans: 1

Q. Which of the following is used in semi-conductors?

  1 Aluminium

  2 Copper

  3 Silicon

  4 None of these

    Ans: 3

Q. The blue colour of the clear sky is due to -

  1 Diffraction of light

  2 Dispersion of light

  3 Reflection of light

  4 Refraction of light

    Ans: 2

Q. In amplitude modulation -

  1 Amplitude of the carrier is kept constant

  2 Change occurs in carrier frequency

  3 Amplitude is varied according to the instaneous value of modelling wave

  4 None of these

    Ans: 3

Q. While checked with a multimeter, an open resistor reads -

  1 Zero

  2 Infinite

  3 High but within tolerance.

  4 Low but not zero

    Ans: 2

Q. Pulley in a belt drive acts as -

  1 Cylindrical pair

  2 Turning pair

  3 Rolling pair

  4 Sliding pair

    Ans: 1

Q. Minority carrier in P-type semiconductor is -

  1 Free electrons

  2 Free holes

  3 Holes and electrons both

  4 Holes minus electrons

    Ans: 2

Q. Which of the following can be used to control the speed of a D. C. motor?

  1 Thermistor

  2 Thyristor

  3 Thyratron

  4 Transistor

    Ans: 2

Q. To convert moving coil galvanometer into an ammeter, which of the following methods is used?

  1 Small resistance in series

  2 Small resistance in parallel

  3 High resistance in series

  4 High resistance in parallel

    Ans: 2

Q. When the load is above ....., a synchronous motor is found to be more economical.

  1 2 KW

  2 20 KW

  3 50 KW

  4 100 KW

    Ans: 3

Q. In resistance heating, highest working temperature is obtained from heating elements made of...

  1 Nickel and copper

  2 Nichrome

  3 Silicon carbide

  4 Silver

    Ans: 2

Q. Among the following statement which is the false?

  1 Only minority impurities are added in a junction diode

  2 Higher temperature increases the leakage current of diode

  3 A simple zener diode works when connected between anode to cathode

  4 Zener is mostly used in voltage regulator

    Ans: 1

Q. In steam turbine the action of steam is -

  1 Stable

  2 Dynamic

  3 Stable and dynamic

  4 Neither stable nor dynamic

    Ans: 2

Q. Protein is not available in which of the following?

  1 Meat

  2 Milk

  3 Rice

  4 Pulse

    Ans: 3

Q. Lever functions on which of the following principles?

  1 Crank-shaft

  2 Joining rod

  3 Crank pin

  4 Cross head

    Ans: 1

Q. What would be the expenditure in 30 days at the rate of 50 paise per unit, if a bulb of 100 W is used five hours per day?

  1 Rs. 10.50

  2 Rs. 8.50

  3 Rs. 7.50

  4 Rs. 9.50

    Ans: 3

Q. What is the frequency of the receiver?

  1 488 kHz

  2 445 kHz

  3 455 kHz

  4 456 kHz

    Ans: 4

Q. A diode....

  1 Functions only in one direction

  2 Functions in both the directions

  3 Does not function at all

  4 It gets damaged, when voltage is applied

    Ans: 1

Q. What is the unit of electrical energy?

  1 Ampere

  2 Volt

  3 Watt

  4 Kilowatt-hour

    Ans: 4

Q. How will a red flower appear, if it is seen through a green glass?

  1 Red

  2 Brown

  3 White

  4 Green

    Ans: 2

Q. What are Ferrites?

  1 Magnetic but have low resistance

  2 Magnetic but have high resistance

  3 Non-magnetic with low resistance

  4 Non-magnetic with high resistance

    Ans: 2

Q. An electronics circuits in which different components such as Diode, Resistor and Capacitor etc. are connected separately is called -

  1 Chassis

  2 Printed board

  3 Integrated circuit

  4 Discrete circuit

    Ans: 3

Q. Selectivity of the receiver can be increased by which of the following?

  1 By using more tuned circuit

  2 By decreasing number of tuned circuit

  3 By using loudspeaker

  4 By increasing gain of the receiver

    Ans: 4

Q. In case of ball bearings, which part is made harder than others -

  1 Ball

  2 Outer race

  3 Inner race

  4 All are made equally hard

    Ans: 4

Q. Which of the following motors is preferred when quick speed reversal is the main consideration?

  1 Squirrel cage induction motor

  2 Wound rotor induction motor

  3 Synchronous motor

  4 D. C. motor

    Ans: 4

Q. Motor-generator set for D. C. arc welding has generator of -

  1 Series type

  2 Shunt type

  3 Differentially compound type

  4 Level compound type

    Ans: 3

Q. ...signal will become zero when the feedback signal and reference signs are equal.

  1 Input

  2 Actuating

  3 Feedback

  4 Reference

    Ans: 2

Q. The capacitance, in force-current analogy, is analogous to -

  1 Momentum

  2 Velocity

  3 Displacement

  4 Mass

    Ans: 4

Q. Co-efficient of velocity as compared to the coefficient of discharge is -

  1 Less

  2 More

  3 Equal

  4 Less or more depending on flow

    Ans: 2

Q. A. C. servomotor is basically a/an ...

  1 Universal motor

  2 Single phase induction motor

  3 Two phase induction motor

  4 Three phase induction motor

    Ans: 3

Q. For generating large currents on D.C. generators which winding is generally preferred?

  1 Progressive wave winding

  2 Lap winding

  3 Retrogressive wave winding

  4 Current depends on design

    Ans: 2

Q. Calorie value is the least of the following materials -

  1 Coal gas

  2 Producer gas

  3 Steam fiery gas

  4 Oil gas

    Ans: 2

Q. Which of the following is not a property of difference amplifier?

  1 Capacitor is used in it

  2 It is used to compare two signals

  3 Difference amplifier yields more than the direct couple ampliier

  4 Frequency of difference amplifier remains flat from zero to high frequency

    Ans: 1

Q. Germanium possesses -

  1 Two valence electrons

  2 Three valence electrons

  3 Four valence electrons

  4 Five valence electrons

    Ans: 3

Q. Moisture can be removed from lubricating oil using -

  1 Tubular centrifugal

  2 Clarifier

  3 Sparkler filter

  4 Vacuum leaf filter

    Ans: 1

Q. The information is sent by CW transmitter by -

  1 Changing the audio frequency

  2 Interrupting radio signal

  3 Using microphone

  4 Using camera

    Ans: 1

Q. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the --

  1 Exhaust will be smokey

  2 Piston rings would stik into piston grooves

  3 Scavenging occurs

  4 Engine starts overheating

    Ans: 1

Q. What is the proper use of signal generator?

  1 Designing

  2 Testing

  3 Repairing

  4 All of the Above

    Ans: 4

Q. Which type of oscillator is most stable in simple circuit?

  1 Crystalline oscillators

  2 Clapp oscillators

  3 Colepitts oscillator

  4 Armstong oscillator

    Ans: 1

Q. What is the S. I. unit of magnetic flux density?

  1 Gauss

  2 Tesla

  3 Oersted

  4 Weber

    Ans: 2

Q. What is the power factor of a pure resistor circuit?

  1 One

  2 Zero

  3 Leading

  4 Lagging

    Ans: 1

Q. A transformer mainly transforms -

  1 Current

  2 Voltage

  3 Frequency

  4 Power

    Ans: 2

Q. There is 20 volt accross the inductor and 15 volt across the resistance in the a.c. supplied series R-L circuit. What would be the supply voltage?

  1 20 volt

  2 15 volt

  3 25 volt

  4 17.5 volt

    Ans: 3

Q. What is the value of knee voltage of silicon diode?

  1 0.3V

  2 0.33V

  3 0.7V

  4 1.1V

    Ans: 3

Q. Estimated time period of a pendulum of length 0.2m is closer to is

  1 .5 sec

  2 1 sec

  3 2 sec

  4 None of these

    Ans: 2

Q. Which of the following light waves is outside the visible spectrum?

  1 Violet

  2 Blue

  3 Yellow

  4 Ultraviolet

    Ans: 4

Q. A periscope works by the principle of

  1 Refraction

  2 Total Internal reflection

  3 Diffraction

  4 Reflection and refraction

    Ans: 2

Q. A falling drop of rain water acquires the spherical shape due to

  1 Surface Tension

  2 Gravitational force

  3 Atmospheric pressure

  4 Viscosity

    Ans: 1

Q. Each of 3 capacitors of capacity C are connected together in series. This combination is added in paralled to a capacitor of capacity C. Resultant capacity will be

  1 C

  2 3C

  3 4C

  4 4C/3

    Ans: 4

Q. A boy has five resistance of 1/5 ohm each. The maximum resistance that can be formed with them is

  1 0.5 ohm

  2 1 ohm

  3 1/25 ohm

  4 1/5 ohm

    Ans: 2

Q. In a telescope of magnification power 10, the focal length of the objective lens is 60 cm, what will be the total length of eyepiece

  1 6 cm

  2 25 cm

  3 30 cm

  4 50 cm

    Ans: 1

Q. A hollow cylindrical rod is filled with air, to make it a resonance column. To produce a wave of length 48 cm the minimum length of rod should be

  1 12 cm

  2 24 cm

  3 48 cm

  4 96 cm

    Ans: 2

Q. An object is placed between the pole of concave mirror and the focus of the mirror, the image formed will be

  1 Behind the mirror, virtual, erect and magnified

  2 At infinity, real inverted and highly enlarged

  3 Byond centre of curvature, real inverted and enlarged

  4 Beyond 2F, real inverted and enlarged

    Ans: 1

Q. When 1 litre of water freezes, the volume of ice formed will be

  1 0.9 litre

  2 1.0 litre

  3 1.11 litre

  4 1.5 litre

    Ans: 3

Q. A body is thrown vertically upwards with a speed of 100 m/sec. While coming back on

ground, its speed at starting point will be

  1 100 m/sec

  2 1000 m/sec

  3 50 m/sec

  4 200 m/sec

    Ans: 1

Q. Which one of the following is not a radioactive element?

  1 Uranium

  2 Radium

  3 Thorium

  4 Cadmium

    Ans: 4

Q. Superconductors are those materials

  1 Which become non-conductors at transition point

  2 Which looses all electrical resistance when cooled below a certain temperature

  3 In which resistance rises to infinity below certain temperature

  4 Which conducts electricity in extra widths

    Ans: 2

Q. Which of the following is a physical change?

  1 Boiling of Water

  2 Rusting of Iron

  3 Boiling of an Egg

  4 Burning of Candle

    Ans: 1

Q. In an atom no two electrons have all the four quantum numbers identical. This is known as

  1 Paulis Exclusion principle

  2 Hunds Rule

  3 Aufbau Principle

  4 Avogadros Law

    Ans: 1

Q. The elements of a group in the periodic table-

  1 are isobars

  2 have consecutive atomic numbers

  3 have similar chemical properties

  4 are isotopes

    Ans: 3

Q. The pH of fresh groundwater slightly decreases upon exposure to air because -

  1 carbon dioxide from air is dissolved in the water

  2 oxygen from air is dissolved in the water

  3 the dissolved oxygen of the groundwater escapes into air

  4 the dissolved carbon dioxide of the groundwater escapes into air

    Ans: 4

Q. Which one among the following nontoxic gases helps in formation of enzymes which ripen fruit?

  1 Methane

  2 Acetylene

  3 Ethane

  4 Carbon dioxide

    Ans: 2

Q. Age of fossil may be found out by determining the ratio of two isotopes of carbon. The isotopes are -

  1 C-12 and C-13

  2 C-13 and C-14

  3 C-12 and C-14

  4 C-12 and carbon black

    Ans: 3

Q. Which one among the following statements is correct?

  1 All bases are alkalis

  2 None of the bases is alkali

  3 There are no more bases except the alkalis

  4 All alkalis are bases but all bases are not alkalis

    Ans: 4

Q. Which one of the following reactions is the main cause of the energy radiation from the Sun?

  1 Diffusion reaction

  2 Chemical reaction

  3 Fission reaction

  4 Fusion reaction

    Ans: 4

Q. Which was mainly responsible for the Bhopal Mishap in 1984?

  1 Methyl Isocyanate

  2 Carbon dioxide

  3 Amonia

  4 Carbon mono-oxide

    Ans: 1

Q. The product used for manufacturing of Industrial alcohol is

  1 Bagasse

  2 Paper-pulp

  3 Molasses

  4 Khandasari

    Ans: 3

Q. Bleaching powder is used in drinking water as a/an

  1 antibiotic

  2 disinfectant

  3 antiseptic

  4 coagulant

    Ans: 2

Q. Which one of the following is the softest?

  1 Aluminium

  2 Sodium

  3 Lithium

  4 Iron

    Ans: 2

Q. The compound which contains both ionic and covalent bonds is -

  1 CH4

  2 H2

  3 NaCl

  4 KCN

    Ans: 4

Q. Number of different oxides formed by nitrogen is -

  1 four

  2 two

  3 four

  4 three

    Ans: 2

Q. The element which form amphoteric oxides is -

  1 antimony

  2 bismuth

  3 sodium

  4 phosphorous

    Ans: 1

Q. The single acid which dissolves gold is -

  1 Nitric acid

  2 Hydrochloric acid

  3 Selenic acid

  4 Aqua regia

    Ans: 4

Q. Rectified spirit is a -

  1 mixture of 95%, ethanol + 5% methanol

  2 mixture of 95% ethanol + 5% H2O

  3 mixture of 95% ethanol + 5% pyridine

  4 100% ethanol

    Ans: 4

Q. One of these substance contains no oxygen. which one?

  1 cryolite

  2 bauxite

  3 dolomite

  4 epsom salt

    Ans: 1

Q. Electrostatic precipitator is used to control

  1 Chemical Pollutants

  2 Radio-active Pollutants

  3 Water Pollutants

  4 Air Pollutants

    Ans: 4

Q. Alcoholic (-OH) group can be identified by:

  1 Tollen's Readent Test

  2 FeCl3 Test

  3 Ozonolysis Reaction

  4 Esterification Test

    Ans: 2

Q. Which gas is used for converting vegetable oils into saturated fats?

  1 H2

  2 O2

  3 Cl2

  4 SO2

    Ans: 1

Q. Which one of the following is used in the preparation of antiseptic solution?

  1 Iodine

  2 Iodine Chloride

  3 Potassium Chloride

  4 Potassium nitrate

    Ans: 1

Q. Which of the following can be used to absorb neutrons to control the chain reaction during nuclear fission?

  1 Uranium

  2 Plutonium

  3 Boron

  4 Heavy water

    Ans: 3

Q. Glycol is added to aviation gasoline because it

  1 prevents freezing of petrol

  2 reduces consumption of petrol

  3 reduces evaporation of petrol

  4 increase efficiency of petrol

    Ans: 1

Q. Sodium thiosulfate (Na2S2O3) solution is used in photography to

  1 remove undecomposed AgBr as a soluble silver thiosulfate complex

  2 remove reduced silver

  3 reduce silver bromide (AgBr) grain to silver

  4 convert the metallic silver to silver salt

    Ans: 1

Q. Which of the following substance is not used in the alloy of stainless steel?

  1 Carbon

  2 Chromium

  3 Manganese

  4 Molybdenum

    Ans: 4

Q. Which of the following is not a chemical fertilizer?

  1 Urea

  2 Sodium sulphate

  3 Super phosphate

  4 Potassium nitrate

    Ans: 2

Q. The venom of Cobra is -

  1 Neurotoxic

  2 Haemotoxic

  3 Both (A) and (B)

  4 None of the above

    Ans: 1

Q. Which gas is filled in refrigerators?

  1 Acetylene

  2 Methane

  3 Mafron

  4 Chlorofluorocarbon

    Ans: 4

Q. Which of the following is the best conductor of electricity ?

  1 Saline water

  2 Warm water

  3 Cold water

  4 Distilled water

    Ans: 1

Q. Which one of the following is used as a moderator in a nuclear reactor?

  1 Radium

  2 Ordinary water

  3 Thorium

  4 Heavy water

    Ans: 4

Q. Which of the following is used as laughing gas?

  1 Nitrogen trioxide

  2 Nitrogen dioxide

  3 Nitrous oxide

  4 Nitrogen tetraoxide

    Ans: 3

Q. Which of the following Chemicals is used for fruit ripening?

  1 Calcium carbide

  2 Sodium chloride

  3 Potassium chloride

  4 None of the above

    Ans: 1

Q. Which one of the following is an air pollutant gas and is released by burning of fossil fuel?

  1 Nitrogen

  2 Hydrogen

  3 Oxygen

  4 Sulphur dioxide

    Ans: 4

Q. What is the main constituent of a Pearl?

  1 Calcium carbonate only

  2 Calcium sulphate only

  3 Calcium oxide and calcium sulphate

  4 Calcium carbonate and magnesium carbonate

    Ans: 4

Q. Gypsum (CaSO4.2H2O) is added to clinker during cement manufacturing to

  1 a decrease the rate of setting of cement

  2 bind the particles of calcium silicate

  3 facilitate the formation of colloidal gel

  4 impart strength to cement

    Ans: 1

Q. Which one among the following elements/ions is essential in small quantities for development of healthy teeth butt causes mottling of the teeth if consumed in higher quantities?

  1 Fluoride

  2 Iron

  3 Chloride

  4 Potassium

    Ans: 1

Q. Contact lenses are made from

  1 Teflon

  2 Polyvinyl chloride

  3 polystyrene

  4 Lucite

    Ans: 2

Q. Which one among the following metals is used for making boats because it does no corrode by seawater?

  1 Nickel

  2 Tungsten

  3 Antimony

  4 Titanium

    Ans: 1

Q. Which one among the following is a strong smelling agent added to LPG cylinder to help in the detection of gas leakage?

  1 Thioethanol

  2 Ethanol

  3 Methane

  4 Chloroform

    Ans: 1

Q. Which one among the following substances evolves heat when dissolved in water?

  1 Calcium oxide

  2 Potassium nitrate

  3 Sodium chloride

  4 Glucose

    Ans: 1

Q. Photochemical smog occurs in

  1 warm, dry and sunny climate

  2 cool and humid climate

  3 cool, dry and sunny climate

  4 warm and humid climate

    Ans: 1

Q. Heavy water implies

  1 deuterated water

  2 water which is used in heavy industries such as thermal power

  3 water which contains SO2-4 and CI- od calcium and magnesium

  4 water which has maximum density

    Ans: 1

Q. Dead organs are generally stored in formalin. Formalin is

  1 aqueous formaldehyde

  2 aqueous ferrous sulphate

  3 aqueous formic acid

  4 aqueous ferric alum

    Ans: 1

Q. When items of jewellery made of metals such as copper or nickel are placed in a solution having a salt of gold, a thin film of gold is deposited by

  1 passing an electric current

  2 cooling to below 0 degree C

  3 heating above 100 degree C

  4 just keeping it for 10 minutes

    Ans: 1

Q. Rainwater collected after 30 to 40 minutes of raining is not suitable for drinking because it

  1 contains dissolved toxic chemicals

  2 contains bacteria and dirt

  3 is deficient in minerals

  4 is acidic

    Ans: 1

Q. Glass is actually:

  1 a vitrifies liquid

  2 a crystalline solid

  3 an ionic solid

  4 an elastic solid

    Ans: 1

Q. Solutions in test tubes containing H2O and aqueous NaOH can be differentiated with the help of:

  1 red litmus

  2 blue litmus

  3 Na2CO3

  4 HCl (aqueous)

    Ans: 1

Q. A student heated some sulphur in a spatula and collected the gas 'X'. Which one among the following is correct about 'X'?

  1 X is SO2 and it turns moist litmus to blue

  2 X is SO3 and it turns moist litmus to red

  3 X is SO2 and it turns moist litmus to red

  4 X is SO3 and it turns dry litmus to blue

    Ans: 3

Q. When concentrated H2SO4 spills on the surface, it should be immediately cleaned:

  1 with a piece of cloth

  2 by adding cold water

  3 by adding solid Na2Co3

  4 by adding solid BaCl2

    Ans: 3

Q. Which of the statements given below is/are correct?1. chloride of calcium2. bicarbonate of calcium3. sulphate of magnesium4. bicarbonate of magnesiumSelect the correct answer using the code given below:

  1 1 and 3 only

  2 1 only

  3 2 and 4

  4 1, 2 and 3

    Ans: 1

Q. Which of the following statements about diamond are correct?1. It is used as a gem in jewellery because of its ability to reflect light.2. It is a good conductor of electricity3. It is used for cutting glass, marble stones and other hard materials4. It is used for drilling of rocksSelect the correct answer using the code given below:

  1 1, 3 and 4

  2 2, 3 and 4

  3 1, 2 and 3

  4 2 and 4 only

    Ans: 1

Q. Which one among the following methods is not effective in removing arsenic from contaminated ground water?

  1 Boiling

  2 Reverse osmosis

  3 Ton exchange

  4 Coagulation-adsorption

    Ans: 1

Q. Bronze is often used to make statues and medals whereas brass is used in making utensils, scientific apparatus and cartridges. Both brass and bronze are copper

containing alloys, yet they differ in their chemical composition for additionally containing:

  1 Zinc in brass and tin in bronze

  2 Chromium in brass and nickel in bronze

  3 Nickel in brass and tin in bronze

  4 Iron in brass and nickel in bronze

    Ans: 1

Q. Sodium thiosulphate (Na2S2O3) solution is used in photography to -

  1 remove undecomposed (AgBr) as a soluble silver thiosulphate complex.

  2 remove reduced silver

  3 reduce silver bromide (AgBr) grain to silver

  4 convert the metallic silver to silver salt

    Ans: 1

Q. Match List-I with List-II and select the correct answer using the code given below the lists-List-I List-II(a) Lactic acid 1. Tamarind(b) Tartaric acid 2. Orange (c) Oxalic acid 3. Tomato(d)Citric acid 4. Citric acid Codes:(a) (b) (c) (d) (A) 2 3 1 4(B) 2 1 3 4(C) 4 3 1 2(D) 4 1

  1 (D)

  2 (A)

  3 (B)

  4 (C)

    Ans: 1

Q. Which one of the following is used as an explosive?

  1 Nitroglycerine

  2 Phosphorus trichloride

  3 Graphite

  4 Mercuric oxide

    Ans: 1

Q. Acute lead poisoning is also known as

  1 Byssinosis

  2 Neuralgia

  3 Itai-itai

  4 Plumbism

    Ans: 4

Q. KMnO4 can be used as a/an

  1 fertiliser

  2 insecticide

  3 disinfectant

  4 pesticide

    Ans: 3

Q. The major component in the LPG is

  1 butane

  2 methane

  3 propane

  4 ethane

    Ans: 3

Q. The most reactive among the halogens is

  1 Bromine

  2 Chlorine

  3 Iodine

  4 Fluorine

    Ans: 4

Q. The electronic configuration of an atom having atomic number '20' is

  1 2, 8, 10

  2 2, 8, 8, 2

  3 2, 6, 8, 4

  4 2, 10, 8

    Ans: 2

Q. When water itself combines chemically with some element or mineral it is called

  1 Carbonation

  2 Oxidation

  3 Desilication

  4 Hydration

    Ans: 4

Q. A solution of zinc chloride cannot be stored in a vessel made of

  1 Lead

  2 Aluminium

  3 Silver

  4 Gold

    Ans: 3

Q. Concentrated, HNO3 can be stored in container made up of—

  1 Cu

  2 Al

  3 Sn

  4 Zn

    Ans: 2

Q. The source of hydrogen for carbon assimilation —

  1 FADH2

  2 NADPH2

  3 H2O

  4 RuBP

    Ans: 2

Q. An important ancillary product used in the petrochemicals industry is —

  1 Naphtha

  2 Petrol

  3 Kerosene

  4 Mobil

    Ans: 1

Q. Coke is obtained by burning—

  1 Iron

  2 Benzol

  3 Naphthalene

  4 Coal

    Ans: 4

Q. Which has the maximum number of atoms?

  1 108 g of Ag

  2 24 g of C

  3 56 g of Fe

  4 26 g of AI

    Ans: 2

Q. ____ is extracted from Bauxite.

  1 Mica

  2 Copper

  3 Aluminium

  4 Tin

    Ans: 3

Q. The main constituent gas of LPG is —

  1 Benzene

  2 Ethane

  3 Methane

  4 Butane

    Ans: 4

Q. Brass is an alloy of -

  1 Copper and Zinc

  2 Copper and Aluminium

  3 Copper and Tin

  4 Iron and Copper

    Ans: 1

Q. Percentage of lead pencils is

  1 31-66

  2 0

  3 40

  4 80

    Ans: 2

Q. The most abundant inert gas in the atmosphere is

  1 Argon

  2 Helium

  3 Neon

  4 Krypton

    Ans: 1

Q. The metal, which is a constituent of Vitamin B12, is

  1 Cobalt

  2 Iron

  3 Zinc

  4 Magnesium

    Ans: 1

Q. Denatured spirit is ethanol mixed with

  1 Pyridine

  2 Kerosene

  3 Petrol

  4 Water

    Ans: 1

Q. To chemical name of 'Commom salt' is

  1 Sodium chloride

  2 Sodium nitrate

  3 Ammonium chloride

  4 Calcium chloride

    Ans: 1

Q. Which mineral is the ore of aluminium?

  1 Bauxite

  2 Haematite

  3 Siderite

  4 Magnetite

    Ans: 1

Q. Chemical name of bleaching powder is:

  1 Calcium Chlorate

  2 Calcium Chloro hypochlorite

  3 Calcium hypochlorite

  4 Calcium bi Chloride

    Ans: 3

Q. Which one of the following is also called Stranger Gas?

  1 Xenon

  2 Argon

  3 Neon

  4 Nitrous oxide

    Ans: 1

Q. Which among the following elements (metals) pollutes the air of a city having large number of automobiles?

  1 Cadmium

  2 Chromium

  3 Lead

  4 Nickel

    Ans: 3

Q. Which of the following is likely to reach our body via the food chain in the event of an atomic bomb explosion?

  1 U-235

  2 Sr-90

  3 K-40

  4 H-3

    Ans: 2

Q. Why is phosphorus kept under water ?

  1 to make it durable

  2 to make it wet

  3 to save it from catching fire when exposed to dry air

  4 water forms a protective coating on it

    Ans: 3

Q. Which of the following is widely used as an anaesthetic?

  1 methane

  2 ammonia

  3 chlorine

  4 chloroform

    Ans: 4

Q. Which of the following is not a compound of calcium?

  1 gypsum

  2 marble

  3 chalk

  4 silicon

    Ans: 2

Q. Which of the following is not a chemical action?

  1 burning of coal

  2 conversation of water into steam

  3 digestion of food

  4 burning of paper

    Ans: 2

Q. Which of the following is incorrect?

  1 Mercury: Hg

  2 Silver: Ag

  3 Sodium: Na

  4 Potassium: Ka

    Ans: 4

Q. Which of the following is a protein ?

  1 rayon

  2 terry cotton

  3 natural silk

  4 nylon

    Ans: 3

Q. Which of the following is a preservative for fruit juices?

  1 CHsCOONa

  2 HCOONa

  3 CoHsCOONa

  4 C2H5ONa

    Ans: 3

Q. Which of the following is a non-ferrous metal?

  1 cobalt

  2 aluminium

  3 nickel

  4 iron

    Ans: 2

Q. Which of the following is a mixture?

  1 gunpowder

  2 iron sulphate

  3 brass

  4 dry ice

    Ans: 1

Q. Which of the following is a fertilizer?

  1 Sodium nitrate

  2 Sodium carbonate

  3 Sodium peroxide

  4 Sodium thiosulphate

    Ans: 1

Q. Which of the following is a chemical change?

  1 evaporation of water

  2 burning of candle

  3 glowing of an electric bulb

  4 liquefaction of air

    Ans: 2

Q. Which of the following has the same atomic number and atomic weight?

  1 hydrogen

  2 helium

  3 oxygen

  4 nitrogen

    Ans: 1

Q. Which of the following has a pH less than 7?

  1 blood

  2 tears

  3 pure water

  4 saliva

    Ans: 4

Q. Which of the following gases is used in the cigarette lighters?

  1 butane

  2 methane

  3 propane

  4 radon

    Ans: 1

Q. which of the following gases is the most toxic?

  1 Carbon dioxide

  2 Carbon monoxide

  3 Sulphur dioxide

  4 Acetic acid

    Ans: 2

Q. Which of the following elements is found in all organic compounds?

  1 Calcium

  2 Carbon

  3 Nitrogen

  4 Oxygen

    Ans: 2

Q. Which of the following elements behave chemically.both as a metal and a non metal?

  1 argon

  2 carbon

  3 xenon

  4 boron

    Ans: 4

Q. What is the chemical name of bleaching Powder?

  1 Calcium Carbonate

  2 Calcium hydrochloride

  3 calcium phosphate

  4 Calcium cynamide

    Ans: 2

Q. What is commonly called limestone is

  1 CaO

  2 CaC2

  3 CaSO4

  4 CaCO3

    Ans: 4

Q. Until the nineteenth Century, aluminium was almost as expensive as gold. The invention of an inexpensive way to extract this metal by a 22-year-old American made this metal inexpensive subsequently. The inventor was

  1 Goldschmidt

  2 Mond

  3 Charles-Martin Hall

  4 Parkes

    Ans: 3

Q. The two elements that exist as liquids at 25°C are

  1 mercury and lithium

  2 mercury and Caesium

  3 bromine and mercury

  4 mercury and argon

    Ans: 3

Q. The term 'Carat' is used to express the purity of gold. The purest form of gold is

  1 18 carats

  2 20 carats

  3 22 carats

  4 24 carats

    Ans: 4

Q. The sulphide ores of metals are concentrated by

  1 cupellation

  2 electrolysis

  3 froth floatation

  4 calcinations

    Ans: 3

Q. The substance that is least prone to catch and spread fire is

  1 Nylon

  2 Terycot

  3 Cotton

  4 Polyester

    Ans: 3

Q. The substance that contains the maximum amount of nitrogen is

  1 Urea

  2 Ammonium Sulphate

  3 Ammonium Nitrate

  4 Ammonium Chloride

    Ans: 1

Q. The purest form of iron is

  1 pig iron

  2 cast iron

  3 wrought iron

  4 stainless steel

    Ans: 3

Q. The nucleus of a hydrogen atom consists of

  1 One Proton + One Neutron

  2 One Protons + Two Neurons

  3 One Neutron Only

  4 One Electron Only

    Ans: 2

Q. The nuclear particles that are assumed to hold nucleons together are

  1 Electrons

  2 Positrons

  3 Neutrons

  4 Mesons

    Ans: 4

Q. The National Chemical Laboratory is situated in

  1 New Delhi

  2 Bangalore

  3 Pune

  4 Patna

    Ans: 3

Q. The names of the scientists, Newlands, Mandeleev and Meyer are associated with the development of

  1 atomic structure

  2 metallurgy

  3 periodic table of elements

  4 discovery of elements

    Ans: 3

Q. The most malleable metal is

  1 platinum

  2 silver

  3 iron

  4 gold

    Ans: 4

Q. The most inexpensive and commonly used variety of glass is called soda glass. it is called so because it

  1 was used initially for making bottles for soda(Carbonated drink)

  2 is made using soda(Sodium carbonate)

  3 was initially used for storing sodium carbonate

  4 is made using soda lime

    Ans: 2

Q. The most important ore of aluminium is

  1 bauxite

  2 magnetite

  3 haematite

  4 monazite

    Ans: 1

Q. The most electropositive elements among the following is

  1 Na

  2 Ca

  3 K

  4 Cs

    Ans: 4

Q. The most electronegative element among sodium, bromium, fluorine and oxygen is

  1 sodium

  2 bromium

  3 fluorine

  4 oxygen

    Ans: 3

Q. The most commonly used bleaching agent is

  1 alcohol

  2 carbon dioxide

  3 chlorine

  4 sodium chloride

    Ans: 3

Q. The molecular formula of phosphorus is

  1 p1

  2 p2

  3 p3

  4 p4

    Ans: 2

Q. The method that cannot be used for removing permanent hardness of water is

  1 adding sodium carbonate

  2 distillation

  3 adding caustic soda

  4 boiling

    Ans: 4

Q. The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

  1 Liquation

  2 Leaching

  3 Levigation

  4 Magnetic Separation

    Ans: 3

Q. The metal that is usually extracted from sea water is

  1 Ca

  2 Na

  3 K

  4 Mg

    Ans: 4

Q. The metal that is used as a catalyst in the hydrogenation of oils is

  1 Ni

  2 Pb

  3 Cu

  4 Pt

    Ans: 1

Q. The metal does not give H2 on treatment with dilute HCL is

  1 Zn

  2 Fe

  3 Ag

  4 Ca

    Ans: 3

Q. The members of a homologous series have

  1 the same physical properties

  2 different functional groups

  3 same chemical properties

  4 different methods of preparation

    Ans: 3

Q. The melting point of copper is

  1 1083°C

  2 732°C

  3 327°C

  4 1835°C

    Ans: 1

Q. The melting and boiling points of ionic solids are

  1 high

  2 low

  3 very low

  4 of intermediate range

    Ans: 1

Q. The maximum number of covalent bonds formed by nitrogen is

  1 1

  2 2

  3 3

  4 4

    Ans: 4

Q. The maximum capacity of any orbital is

  1 2

  2 6

  3 14

  4 cannot be determined unless the principal quantum number is known

    Ans: 1

Q. The material that can be permanently deformed by heat and pressure is called a

  1 thermoplastic

  2 thermoset

  3 chemical compound

  4 polymer

    Ans: 1

Q. The mass of one Avogadro number of helium atom is

  1 1.00 g

  2 4.00 g

  3 8.00 g

  4 4*6.02*10 raised to power 23 g

    Ans: 2

Q. The mass number of an atom is equal to

  1 the number of protons

  2 the number of protons and electrons

  3 the number of nucleons

  4 the number of neutrons

    Ans: 3

Q. The mass number of a nucleus is

  1 always less than its atomic number

  2 the sum of the number of protons and neutrons present in the nucleus

  3 always more than the atomic weight

  4 a fraction

    Ans: 2

Q. The major constituent of air is

  1 Nitrogen

  2 Carbon dioxide

  3 Oxygen

  4 Hydrogen

    Ans: 1

Q. The main use of salt in the diet is to

  1 make the taste of food better

  2 produce hydrochloric acid in small amounts for the digestion of food

  3 ease the process of cooking

  4 increase the solubility of food particles in water

    Ans: 4

Q. The hydrogen ion

  1 H+

  2 HO-

  3 H2+

  4 H3o+

    Ans: 2

Q. The high reactivity of fluorine is due to

  1 Its high electronegativity

  2 Small size of flourine atom

  3 Availability of d-orbitals

  4 Strong f-f bond

    Ans: 1

Q. The hardest form of carbon is

  1 Coke

  2 Graphite

  3 Diamond

  4 Charcol

    Ans: 3

Q. The gas used in the manufacture of vanaspati from vegetable oil is

  1 Hydrogen

  2 Oxygen

  3 Nitrogen

  4 Carbon dioxide

    Ans: 1

Q. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

  1 3 billion years

  2 100 years

  3 0.01 minute

  4 13 days

    Ans: 3

Q. The first metal to be used by man was

  1 Aluminium

  2 Copper

  3 Silver

  4 Iron

    Ans: 2

Q. The enzyme that splits polysaccharides in the month is

  1 Zymase

  2 Invertase

  3 Sucrose

  4 Amylase

    Ans: 2