q bank sci july13

7/28/2019 Q Bank Sci July13

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Question Bank

Class VIth Subject Science Air around Us - 16

Qus.1. Fill in the blanks

a) Air is _____ of gases.b) _____ constitutes about 78% of air.c) _____ is needed for burning.d) During respiration, we utilize _____ and give out _____.e) Plants take _____ in during photosynthesis.f) Air contains 78% of _____ and 21% of _____.g) _____ is used up during burning.h) Air contains _____ % of CO2.i) _____ is needed for respiration.j) Earthworms breathe through _____.

Qus.2. Name the following.

a) The most abundant gas in air _____.b) The gas required by plants to make their own food _____.c) The gas taken in during respiration by animals _____.d) The gas taken in during respiration out animals _____.e) The form of water that is present in air _____.f) The substance which keeps the skin of earthworm moist _____.g) A thick blanket of air which surrounds our atmosphere ______.h)

Moving air is called _____.

i) During burning, _____ gas is produced.j) Plants have tiny pores called _____.k) Insects respire through tiny holes in their bodies called _____.l) Most aquatic animals respirate through_____.

Qus.3.) Who am I?

a) I am an odorless gas needed by green plants to make food.b) I rise into the air when the sun heats the oceans and rivers.c) I am a vital gas required by all living beings.d) You can see me dancing in sunrays while entering in your room.e) I constitute the layer of the atmosphere that gives protection from ultraviolet radiations of the

sun.

f) I am the most abundant constituent of the air.Qus.4.) Define

a) Atmosphere b) pollution c) respiration d) Photosynthesis e) Stomata f) spiracles g) Mucous h) gills


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Qus.5.) Choose the Correct answer

a) Air is made up of 1) one gas 2) three gases 3) several gases 4) none of these.b) Gas with the highest percentage in air is 1) oxygen 2) nitrogen 3) CO2 4) Water Vaporsc) Air contains 1) oxygen 2) water vapors 3) dust and smoke 4) all of thesed) For photosynthesis , plants need 1) oxygen 2) nitrogen 3) CO2 4) none of thesee) Main causes of air pollution are 1) excessive burning of fuels 2) burning of wood 3) vehicles

releasing smoke 4) all of these.

Qus.6.) One mark questions.

a) Name any two diseases those are caused due to air pollution.b) Where stomata dos found on the leaf?

Qus.7.) Two marks questions.

a) What is air composed of?b) How do insects and earthworms breathe in air?c) Why do whales and dolphin often come to the surface of water?d) How does air pollution affect living organism?e) List any two ways by which air pollution can be reduced?

Qus.7.) Three marks questions.

a) How do plants and animals keep a balance of oxygen and carbon dioxide level in air?b) Define pollution. List three common causes of pollution.


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Question Bank

Class VIth Subject Science Separation of substances - 03

Qus.1.) Fill in the blanks.

a) Grains and Husk can be separated using _____.b) When small stones need to be removed from rice, we use the process of _____.c) In sedimentation, the upper liquid is called _____ and the heavier particle layer at the bottom is

called _____.

d) _____ is used to separate the stones and pebbles from sand at construction sites.e) _____ and _____ can be used for separating insoluble solid from a liquid.f) The substance that dissolves is called _____.g) The solution in which no more of solute can be dissolved is called _____.

Qus.2.) Rewrite the following correctly by changing the underlined words.

a) Threshing involves dropping the grains.b) Tiny stones can be removed from rice by sieving.c) Sedimentation and Filtration are commonly used by farmers to separate pieces of chaff from

grass.

d) The process of pouring out the clear upper liquid without disturbing the sediments is calledFiltration.

e) If the components are of different sizes, they can be separated by Evaporation.f) Condensation is a change where substances mix completely with the liquid. They have been

added to and cannot be separately easily.

g) When matter changes from its gaseous state into its liquid state is called Evaporation.Qus.3.) Define

a) Threshing b) Winnowing c) Sedimentation d)Decantation e) Filtration f) Saturated solution g)Solute h) Solvent i) Supernatant j) Sediments k) evaporation l) Condensation

Qus.4.) Identify and name the following processes.

a) The process involving beating the stalks to separate the seeds or grains.b) The process of separating insoluble solids suspended in a liquid by allowing them to settle down.c) The process by which an insoluble solid and a liquid are separated by passing the mixture

through a device.

d) The process of changing a gas into liquid form.


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e) The method commonly practiced by farmers to separate pieces of chaff from the grains by windor blowing air.

f) The process of pouring the clear upper liquid without disturbing the sediments is called.g) The process of changing from gaseous state into its liquid state is called.h) A solution that can dissolve no more of solute is called.


a) Why do we need to separate the components of a mixture?b) Differentiate between sedimentation and decantation?c) How winnowing is done?d) Discuss two ways in which threshing is commonly done?e) When handpicking method is considered the preferred option?f) What is filtration? Give two examples of it.g) How salt is collected from sea water?h) How would you make a saturated salt solution?i) How can the solubility of a substance be increased?

Qus.6.) Three marks questions.

a) What is Threshing? Discuss two ways in which threshing is commonly done?b) What is winnowing? How it is done?c) What is Handpicking? When this method is considered the preferred option?d) Define saturated solution. How would you make a saturated salt solution?


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Question Bank

Class VIth Subject Science Electricity & Circuits - 14


a) A ____ is a device that produces electric current.b) In a dry cell, electricity is produced by _____.c) Electric current flows in _____ direction.d) Electric current flows only if the circuit is _____.e) When we switch off the light .The electric current is_____.f) A dry cell has _____ terminals.g) A _____ is a material through which electric current cannot flow.h) A _____ is a material through which electric current can flow.i) All metals are _____ conductor of electricity.j) A _____ is a path for an electric current to flow.k) Solar cells use _____ to produce electric current.

Qus.2.) True / False

a) In a dry cell electricity is produced by the sun.b) Electric current flows in particular direction.c) Electric current flows only if the circuit is closed.d) A dry cell has two terminals.e) Electric current flows from negative to positive terminal.f) We cannot turn off the light using an on/off switch.g) A switch is sometimes referred to as key.h) An insulator is a material through which electric current cannot flow.i) All metals are bad conductor of electricity.j) Solar cells use sun light to produce electric current.

Qus.3.) Define

a) Source of electric current b) Cell c) Dry Cell d)Electric current e) Electric switch f) Conductorg) Insulator h) Secondary cell i) Fuse

Qus.4.) Answer the followings.

a) The thin metal wire in an electric bulb that heats up and glows when an electric current passesthrough it.

b) A source of electric current that is easy to carry around and which contains semisolid ingredients.


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c) The two ends of an electric battery or cells which are connected to connecting wires to drawelectric current.

d) A path for electric current to flow.e) An electric circuit which has unbroken path through which an electric current can flow.f) A device used to close or open an electric circuit _____.g) A material through which an electric current can flow easily.


j) Give one difference between a cell and a battery.k) Why an electric bulb is filled with an inert gas?l) In which direction electric current flows?m) Why a fuse is called a safety device?

Qus.6.) Multiple Choice Questions.

a) A dry cell contain ingredients which are mainly a) Solids b) Liquids c) Semisolids d) Gasesb) Which of these can produce electric current ? a)Cells b) Batteries c) Solar cells d)All of thesec) An electric key is another name for? a)Electric circuits b) Electric switch c) electric cell

d)Electricity

d) Which out of the following is a set of only good conductors of electricity?a)Wood,Graphite,Copper b) Graphite,Copper,Silver c) Graphite,Plastic,glass d) pure

water,Copper,Silver

Qus.7.)Two marks questions.

a) What do you understand by a source of an electric current? Give at least two examples.b) Explain the working of a simple dry cell.c) Draw a circuit diagram for a circuit consisting of a cell, a switch and an electric bulb.d) List the conditions required to set up an electric current.e) When the circuit is said to be opened and closed?f) How does an electric switch work?g) With the help of a diagram explain the working of an electric torch.h) Define Conductors and Insulators. Give at least two examples of each.


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Question Bank

Class VIth Subject Science Fiber to Fabric - 04


a) ____ And _____ are obtained from plants.b) ____ And _____ are obtained from animals.c) Fabric is made up of _____ which is then _____ or _____.d) After harvesting cotton is sent for ____.e) Silk cotton is obtained from _____ tree.f) Cotton grows best in _____ soil.g) We get cotton and jute from _____.h) _____ is done to separate cotton fibers from seeds.i) _____ is woven to make fibers.j) Fibers are woven to make _____.k) The fiber obtained from outer covering of the fruit of the coconut palm is _____.l) Jute is obtained from _____ of the jute plant.m) Fabric obtained from flax plant is _____.


a) We get cotton and jute from animals.b) Ginning is done to separate cotton fibers from seeds.c) Jute is the fiber obtained from the outer covering of jute fruit.d) Yarn is woven to make fibers.e) Retting is needed to separate cotton fibers from the stem of the plant.f) Jute is obtained from the stem of the jute plant.g) Fiber obtained from the stem of the hemp plant is silk.h) Coir is obtained from the jute.i) Fabric obtained from the flax plant is linen.j) Solar cells use sun light to produce electric current.

Qus.3.) Define

a) Fabric b) Ginning c) spinning d) Weaving e) RettingQus.4.) Give one word for the followings.

a) Process of making yarn from fiber.b) Process of removing sticky substance from stem to get fiber.c) Process of making fabric from fiber using looms.


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d) Fiber used for making khadi.e) Tree from which silk cotton is obtained.f) Fiber obtained from the bark of the jute plant.g) Fiber obtained from the stem of the hemp plant.h) Fiber obtained from the flax plant


a) Name any two natural fibers.

b) From which material clothes are mostly made up of?

c) Name any two synthetic fibers.

d) Name any two plant fibers.

e) Name any two animal fibers.

f) Name any two natural sources of fibers.

g) Give one use of flex fiber.

Qus.6.)Two marks questions.

a) Name the natural sources of fibers. Give four examples.b) What are the synthetic fibers? Give at least three examples.c) Describe the two processes of making fabric from fiber.d) Write the steps involved in the production of cotton.e) What is jute? How it is extracted? List some uses of jute.f) What is coir? What is it used for?g) Write a short note on silk cotton.

Qus.7.) Rewrite the following correctly by changing the underlined words.

a) Knitting is done using devices called looms.b) We get cotton and jute from animals.c) Nylon and acrylic are natural fibers.d) Jute used as a stuffing in life jackets and pillows.e) Line fabric is obtained from hemp plant.f) The process of making yarn from fiber is called retting.g) Retting is needed to extract silk cotton.h) Khadi is a coarse cloth made up from silk cotton.i) Jute is obtained from stem of the jute plant.j) Fabric obtained from flax plant is cotton.


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Qus.8.) Match the followings.

Silk cotton Flax

Hemp Kapok

Coir Hemp

Linen Coconut palm

Wool Synthetic fiber

Nylon Natural Fiber


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Question Bank

Class VIth Subject Science Changes around Us - 6


a) The changes that can be reversed are called ____ changes.b) Ripening of fruit is an example of _____change.c) Freezing of water is an example of _____change.d) Tearing of paper is an example of _____change.e) _____ causes water to change into steam.f) Burning of paper is an example of _____change.g) Blowing air into a balloon is an example of _____change.h) The effect of cooling is opposite to that of _____.i) The changes that cannot be reversed are called ____ changes.j) The changes in which no new substances formed are called ____ changes.k) The changes in which new substances with different properties formed are called ____

changes.


a) Burning of paper is an irreversible change.b) Blowing air into a balloon is an irreversible change.c) Frying a fish is a chemical change.d) The effect of cooling is opposite to that of heating.e) Expansion of gases is much more than expansion of solids.f) The changes in which no new substances formed are called chemical changes.g) A substance on heating expands and on cooling it contracts.

Qus.3.) Define

a) Reversible change b) Irreversible change c) Physical Change d) Chemical ChangeQus.4.) Identify the followings changes are reversible / irreversible.

a) Changing of water to vapor.b) Melting of chocolate.c) Growth of a puppy into a dog.d) Burning of a fire cracker.e) Woolen yarn to knitted sweater.f) Batter to cake.g) Rice grains to cooked rice.


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h) Juice to ice lollipops.i) Dough to chapattis.j) Bread to toast.k) Egg to omelets.

Qus.5.) Identify the followings changes are Physical / Chemical.

a) Making curd from milk.b) Boiling an egg.c) Melting of butter.d) Burning of a matchstick.e) Breaking of a glass jar.f) Freezing of water.g) Tearing of water.h) Cooking of food.i) Growth in plants and animals.

Qus.6.) Two mark questions.

a) What are Physical changes? Give two examples.b) What are Chemical changes? Give two examples.c) What are Reversible changes? Give two examples.d) What are Irreversible changes? Give two examples.e) Why does hot water glass crack when placed under cold water?f)

Why an inflated balloon does shrinks in size when kept inside a freezer?

g) How is expansion due to heating used to fix a rubber tyre on to a wheel?h) Why small gaps are left between railway tracks.

Qus.7.)Three marks questions.

a) How irreversible changes are are different from reversible changes? Give at least two examples ofeach type.

b) Name three physical states of water. How can you convert liquid state to water into its solidstate?


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Question Bank

Class VIth Subject Science Sorting Material into Groups - 05


a) Sandpaper is ____ touch.b) _____ is insoluble in water.c) Wood will _____ in water.d) Air is a _____ conductor of heat.e) _____ is a good conductor of electricity.f) Carbon dioxide is _____ in water.g) Oil is _____ in water.h) Metals have _____ appearance.


a) Bark of a tree is rough.b) Wood is a transparent material.c) Different objects cannot be used to make an object.d) Carbon dioxide is insoluble in water.e) Coconut oil is immiscible in water.f) Metals have shiny appearance.g) A substance on heating expands and on cooling it contracts.

Qus.3.) Define

a) Grouping b) Miscible c) Immiscible d) Classification e) Transparent f) Opaque g) Conductors h)Insulators i) Magnetic materials

Qus.4.) Multiply choice questions

a)

Metals have shiny appearance called a)Smoothness b) Luster c) Conduction d) Transparencyb) Liquids that are insoluble in water are said to be a)Miscible b)Immiscible c)Luster d) dissolvedc) Which of the following would sink in water a) A dry leaf b) A bird feather c) A wooden cork d) A

metal key

d) Which of the following is not miscible in water a) Honey b) Alcohol c) Kerosene d) Orange Juicee) Which of the following is a good conductor of heat? a) Iron b) Plastic c) Paper d) Wood


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Qus.5.) Two mark questions.

a) Why do we need to sort materials into groups?b) Why metals are used for making jewellery?c) Why are cooking utensils made of metals?d) Write a short note on Floatation with an example.e) Name three substances that are attracted to a magnet. By which property they attract a magnet?f) On what basis different types of materials can be grouped?

Qus.6.)Three marks questions.

a) How are Rough materials different from Smooth materials? Give at least two examples of each.b) Name two gases that are soluble in water .Give one use of each.c) Differentiate Conductors and Insulators.d) Give two examples each of the object formed by the mentioned materials. a)Glass b)Wood c)

Metals

e) Give difference between Miscible and Immiscible liquids.

Qus.7.)Three marks question.

Give at least three differences between Solids, Liquids and Gases.


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Question Bank

Class VIth Subject Math Properties of Whole Numbers - 4

Qus.1.) Fill in the blanks

a) The smallest natural number is _____.b) The first natural number is _____.c) The number 0 together with natural numbers form _____ numbers.d) A number one more than a given whole number is called its _____.e) A number one less than a given whole number is called its _____.f) The smallest whole number is _____.g) If aand b are any two numbers, then a+b is also _____ a number.h) a+b = b+ _____.i) Dividend = (Divisor * _____) + Remainder.j) Zero divided by any whole number other than zero is _____.k) If a is any non-zero whole number then a/a= _____.l) _____ + 18 =30m) Every natural number is greater than _____n) 95 43=_____o) (7+ _____) + 11 =(11+7) + 8

Qus.2.) which of the following statement is true?

a) Zero is less than every natural number.b) The smallest number of 3 digits is 1000c) There is one whole number between 18 and 19d) Given two natural numbers a and b such that a>b then a+1?b+1e) The smallest number that can be formed from 9,0 and 3 is 039f) Zero is a natural numberg) If a , b and c any three whole numbers then a+(b+c) + (a+b) +ch) 87-38=49 , a whole numberi) If a,b and c are any three whole numbers such that a>b and c not equal to zero then a*c > b*cj) If a,b and c are any three whole numbers such that a


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Qus.3.) Match the following.

25*(49*38) = 25*(38*49) Distributive property of multiplication over subtraction

47*28*10=47*(28*10) Commutative property of multiplication

67*99 = 67(100-1) Associative property of addition

40+(36+29) = (40+36) +29 Associative property of multiplication

Qus.4.) MCQs

a) The smallest natural number is a) -1 b) 0 c) 1 d) 2b) The smallest whole number is a) -1 b) 0 c) -2 d) 2c) The successor of 27 is a)26 b) 25 c) 28 d) 29d) The product of two odd numbers is a) an odd number b) an even number c) either a or b d) a

prime number.

e) The value of 5*0 is a) 5 b) 0 c) 50 d) 500f) The value of 10/0 is a) not defined b) 0 c) 10 d) 100g) The value of 7290 * 83 + 7290 * 17 is a) 481140 b) 72900 c) 729000 d) 123930h) The value of 5603*363 5603 * 63 is a) 5603000 b) 1681900 c) 1680900 d) 1580900i) The value of 237*197 is a) 44319 b) 70389 c) 197000 d) 46689


a) Write the Successor of a) 9835675 b) 2308869b) Write the predecessor of a) 500000 b) 7056821c) In each of the following pair of numbers, which one of the left of the other on the number line.

Also write them using > or < between them a) 56789 , 98765 b) 9830415 , 10023001

d) If the product of two numbers is one, can we say that one or both of them will be one? Justifythrough example.


a) Rearrange the digits of the numbers 20056073 to get the smallest and greatest number.b) Add the greatest number of 4 digits to the smallest of the 5 digits number.c) Find the sum by suitable arrangement. A) 335+409+265 b) 273+512+627+388d) Find the population of a village which has 8750 men 7963 women and 2037 children.e) By using properties of multiplication find 275*98 =f) Find the product 4* 1813 * 25 by using properties of multiplication.g) Find the value of 738*25 +738*45h) Find the largest five digit number which is exactly divisible by 236.i) Find the least number which should be added to 10000 so that sum is exactly divisible by 129.j) A school hall is to be constructed is such a way that each row has 28 seats. Determine the

minimum number of rows required to sit 650 students at a time.


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a) In a school 256 boys and 248 girls were present on Monday and 237 boys and 261 girls werepresent on Tuesday. How many students were present on each day and which day has more

attendance.

b) A driver filled 40 liters of petrol in his car on Monday. The next day he filled 50 liters of petrol. Ifthe petrol costs Rs 45 per liter. What is the total amount that driver has spent.

c) Kuljeet buys 15 sets of pen and ball pen for distributing to her friends on the eve of her birthday.If the cost of a pen is Rs 34 and ball pen is Rs 16, how much does she spend on these?


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Question Bank

Class VIth Subject Math Factors and Multiples - 3

Qus.1.) Fill in the blanks

a) Any number which is an exact divisor of a given number is called _____ of the given number.b) _____ is a factor of every number.c) Every number has a _____ number of factors.d) Every number has a _____ number of multiples.e) A number which is exactly divisible by 2 is called a _____.f) A number which is not exactly divisible by 2 is called a _____.g) A natural number greater than 1 which has no factors except 1 and itself is called _____.h) _____ is a neither prime nor composite.i) A number which has at least one factor other than 1 and itself is called _____.j) _____ is only prime number which is even.k) _____ is the smallest odd composite number.

Qus.2.) which of the following statement is true?

a) The sum of three odd numbers is even.b) The sum of two odd and one even numbers is even.c) The product of three odd numbers is odd.d) If an even number is divided by two, the quotient is always odd.e) Prime numbers do not have any factors.f)

All even numbers are composite numbers.

g) Every natural number is a multiple of itself.h) The sum of two odd numbers is even.i) Every prime number is odd.j) Every natural number is either prime or composite.k) The product of two odd numbers is always an odd number.l) 1 is a factor of every natural number.m) 2 is only even prime number.n) Both 3 and 9 are factors of 15.o) 1 is a prime number.p)

9 is the smallest odd composite number.

q) If a is any whole number then a/1=a.r) Sum of 2 prime numbers is always even.s) If a number is divisible by 4, it is also divisible by 2.t) If a number exactly divides three given numbers, then it must be exactly divisible by their sum

also.


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Qus.3.) Match the following.

A number exactly divisible by 2 Prime numbers

A number exactly not divisible by 2 Composite numbers

A number having two factors one and itself Even numbers

A number having factors other than one and itself Co-prime numbers

Pair of prime number having differences of 2 Odd numbers

Two numbers which have only common factor one Twin Prime numbers

Qus.4.) Two Marks questions

a) Write down all the factors of a) 49 b) 63 c) 100b) Write down first four multiples of a)5 b)8 c) 10c) List twin prime numbers between 1 and 50.d) List all numbers less than 50 that are multiples of 3 and 4e) Write each of the following numbers as the sum of twin primes. a) 8 b) 24f) Find prime factorization of each of the following a) 150 b) 475 c) 3548g) Find the prime factors of 231. By arranging the factors in ascending order. Find the relation

between two consecutive factors.

h) Using prime factorization find H.C.F. of a)72 , 56 b)15 , 25 , 30i) Find the L.C.M of a)12 and 16 b) 4 and 6

Qus.5.) Three Marks questions.

a)

Using division method find the H.C.F. of 180 , 252 and 324b) It is given that 65610 is exactly divisible by 27. Which two numbers nearest to 65610 are each

divisible by 27.

c) Find the L.C.M. of a) 35 , 50 , 72 and 36 b) 95 , 110 ,22 and 11d) Find the least number which on adding 15 is exactly divisible by 10, 15, 25, 30, 40 and 45.e) When 21 are added to a number, it is exactly divisible by 3, 8, 9, 12, 16 and 18. How many such

numbers exist? Find the least of them.

f) The H.C.F. and L.C.M. of two numbers are 89 and 1335 respectively. If one of the number is267. Find the other.

g) The H.C.F. of two numbers is 29 and their L.C.M. is 1160. If one of the numbers is 145. Find theother.

h) The L.C.M. of two numbers 525 and 945 is 4725. Find their H.C.F.i) The H.C.F of two numbers 833 and 1071 is 119. Find their L.C.M.


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Qus.6.) Four Marks questions.

a) The floor of a room is 6 m 50 cm long and 5 m 25 cm wide. It is to be paved by square marblestone tiles. Find the largest size of each tile and hence find the least numbers of tiles required.

b) Three farmers have 490kg, 588 kg and 882 kg of wheat respectively. Find the maximumcapacity of a bag. So that the wheat can be packed in exact number of bags. Find also thenumber of bags required to pack this wheat.

c) Find the greatest number of 5 digits which on dividing 3, 12, 18, 24, 30 and 36 leaves 2, 11, 1723, 29 and 35 remainder respectively.

d) Find the least number of 6 digits which on dividing 15,20,25,30,35 and 40 leaves remainder10,15,20,25,30 and 35 respectively.

e) Four bells ring at the interval of 8, 12, 18 and 20 minutes respectively. At what time will theyring together? If they start ringing simultaneously at 12:00 noon?

f) Find the largest five digit number which is exactly divisible by 236.g) Find the least number which should be added to 10000 so that sum is exactly divisible by 129.h) A school hall is to be constructed is such a way that each row has 28 seats. Determine the

minimum number of rows required to sit 650 students at a time.

q bank sci july13

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