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CLASS: VIII

DAILY ASSIGNMENT

SUBJECT WISE COMPILED ANSWER KEY

FOR WEEK -4 (11.05.2020 T0 16.05.2020)

SUBJECT: ENGLISH

11.05.2020: UNSEEN PASSAGE

A1. (D) – He wanted to impress the salesman

Justification: Because when he came in casual dress in the morning, he got very little

attention.

A2. (C) – only rich customers

Justification: The sale of the shop depends on rich and well-off customers who came there to

spend money.

A3. (A) – He was not interested in purchasing anything now.

Justification: He had no intentions of buying anything. He was just doing show off.

A4. (A) – He would give him exactly what he was looking for.

Justification: The salesman was unable to satisfy the man.

A5(C) – He had come only to make a point about the indifferent attitude of the salesman

towards casually dressed customers.

Justification: He had a bad experience when he had been to the shop earlier. The salesman

did not show respect to him as he was casually dressed.

12.05.2020: PRONOUNS

A1. (B) – anything

Justification: It is used instead of something in negative sentences and in questions;

after if/whether; and after verbs such as prevent, ban, avoid, etc.

A2. (A) – everything

Justification: It is used for an identifiable, but not specified, person or thing.

A3. (A) – something

Justification: It is used for referring to a thing, idea, fact etc when you do

not know or say exactly what it is

A4. (A) – no one

Justification: No one is used where it means no person; not a single person. No one can also

be employed with an additional noun, where one describes singularity to the noun and

no inverts it.

A5. (A) – no one

Justification: No one is used where it means no person; not a single person. No one can also

be employed with an additional noun, where one describes singularity to the noun and

https://www.macmillandictionary.com/dictionary/british/used

https://www.macmillandictionary.com/dictionary/british/refer

https://www.macmillandictionary.com/dictionary/british/idea

https://www.macmillandictionary.com/dictionary/british/fact

https://www.macmillandictionary.com/dictionary/british/know_1

https://www.macmillandictionary.com/dictionary/british/say_1

https://www.macmillandictionary.com/dictionary/british/exactly

https://www.definitions.net/definition/where

https://www.definitions.net/definition/means

https://www.definitions.net/definition/single

https://www.definitions.net/definition/employed

https://www.definitions.net/definition/additional


https://www.definitions.net/definition/describes

https://www.definitions.net/definition/inverts


https://www.definitions.net/definition/means

https://www.definitions.net/definition/single

https://www.definitions.net/definition/employed

https://www.definitions.net/definition/additional


https://www.definitions.net/definition/describes

no inverts it

13.05.2020: POETRY COMPREHENSION

A1. (D) – The sun descends in the west

Justification: After sunset, the stars appear In the sky.

A2. (C) – a bouquet of flowers

Justification: Because in heaven, the moon looks like a bouquet.

A3. (A) – flower

Justification: The moon shines at night in the sky and smiles on earth.

A4. (B) – give blessing and joy

Justification: The angels are considered as good souls who give blessings to all living beings.

A5. (D) – The occupants are asleep without any care.

Justification: The occupants in the nest are the birds who are sleeping in their nests during

night.

14.05.2020: POETRY COMPREHENSION

A1. (C) – He gave some money (gold refers to money)

Justification: Because the poet was sad and unhappy.

A2. (D) – Sympathy

Justification: The proud man was very stone hearted. He did not speak a word to the poet.

A3. (C) – The poor man gave food to the poet and took care of him day and night.

Justification: He helped the poet when he was in pain and deep sorrow.

A4. (B) – The poor man blessed the charity of the poet.

Justification: This statement is not true because the poet had nothing to return to the poor

man.

A5. (A) – Charity

Justification: This word charity means to help someone with money or donation.

15.05.2020: LESSON 1 : FOOTLOOSE IN AGRA

A1. (C) – rickshaw pullers, tonga drivers, cyclists

Justification: The roads of Agra are crowded therefore rickshaws and tongas are convenient.

A2. (A) – Fruit of Ashoka tree

Justification: He was the son of head gardener and so he used to pluck fruit of Ashoka tree

and eat them.

A3. (D) – Footloose in Agra

A4. (D) – Ruskin Bond

Justification: He has shared his experience of Agra and beauty of Taj Mahal.

https://www.definitions.net/definition/inverts

A5. (B) – The sharp flavour of Ashoka tree

Justification: The taste of the fruit was sour but not unpleasant.

16.05.2020:UNSEEN PASSAGE

A1. (C) – It has wrinkled skin covered with yellow feathers.

Justification: Pigeon is considered as a revolting bird due to its unpleasant appearance.

A2. (A) – he was fat and ugly.

Justification: The bird looked ugly and repulsive. The colour of pigeon was horrible yellow

with wrinkled scarlet skin.

A3. (C) – he complained loudly if he was not taken along

Justification: The pigeon Quasimodo used to go walking with them as it never considered

itself to be a bird.

A4. (D) – left behind during walks.

Justification: The pigeon could not match with their speed as it walked slowly.

A5. (B) – there was a chance of the bird soiling the clothes

Justification: If the bird was allowed to be carried on the shoulder, there was a risk of getting

the clothes spoilt.

SUBJECT: COMPUTER

ANSWERS TO ASSIGNMENT/CLASS-VIII/COMPUTER/DATE:11.05.2020

1. (c) Computer software

Explanation:. They are the set of machine readable instructions that directs a processor to

perform specific operations.

2. (a)1 Megabyte

Explanation:

8 bits 1 byte

1024 bytes 1 KB(kilobyte)

1024 KB 1 MB(megabyte)

1024 MB 1 GB(gigabyte)

1024 GB 1 TB(terabyte)

1024 TB 1 PB(Petabyte)

1024 PB 1 EB(Exabyte)

1024 EB 1 ZB(zetabyte)

3. (a)Wired

Explanation: It includes electrical cables that are used to carry signals from one end to

other.

4. (d) Format

Explanation: Components of database are-Fields, table, table structure, queries, datasheet,

reports, forms.

5. (a)Topology

Explanation: It is the arrangement of the elements of a communication network which

comprises of nodes and connecting lines.


1. (b)Mouse

Explanation: It consists of a roller at the bottom on which it can roll the upper part .It is

popularly known as a pointing device

2. (a)1 Gigabyte

Explanation:

8 bits 1 byte

1024 bytes 1 KB(kilobyte)

1024 KB 1 MB(megabyte)

1024 MB 1 GB(gigabyte)

1024 GB 1 TB(terabyte)

1024 TB 1 PB(Petabyte)

1024 PB 1 EB(Exabyte)

1024 EB 1 ZB(zetabyte)

3. (a)Banks and offices

Explanation:. Computers are used extensively for storing information and processing

transactions from an account.

4. (b)Slow data access

Explanation: Advantages of using database:

Simple, Faster data Access, Better Data Transferring, Minimized Data Inconsistency

5. (a) Mesh topology

Explanation: Every devices is connected to another devices via particular channel


1. (b)Wireless local area network

Explanation:. WLAN means wireless local area network. A wide area network (WAN) is

a telecommunications network that extends over a large geographical area for the primary

purpose of computer networking

2. (d) Cell

Explanation:. 1) Ribbon: It displays groups of related commands in tabs.

2) Database objects: An access database has four main objects – Tables, Queries, Forms and

Reports.

3) Navigation Pane: It lists all available database objects.

4) Status Bar: It displays information about the current object or view.

5) Work area: It differs according to database elements select

3. (b)Key topology

Explanation: Types of topologies are mesh, ring, star, hybrid and bus topology.

4. (a)LAN

Explanation:. A LAN connects network devices over a relatively short distance. A

networked office building, school, or home usually contains a single LAN. LANs are also

typically owned, controlled, and managed by a single person or organization.

5. (a)Star topology

Explanation: In star topology all the devices are connected to single hub through a cable


1. (a)Network interface card

Explanation. It is a hardware device that has a port which helps to join the network cable to

the computer. Every computer in the network has one NIC

2. (d)Login security

Explanation: : Only those people who have a username and a password can access the data

3. (a)Modem

Explanation: : It is a device that joins the digital to analogue telephone line.

.4.(a)Wired media

Explanation: . It includes electrical cables that are used to carry signals from one end to

other.Ex- twisted pair cable, optical fiber.

https://www.lifewire.com/what-is-lan-4684071

https://en.wikipedia.org/wiki/Telecommunications_network

https://en.wikipedia.org/wiki/Computer_network

https://www.lifewire.com/what-is-lan-4684071

5.(d)Bus topology

Explanation: It is a network in which every computer and network devices is connected to

single cable.


1. (c) PAN

Explanation: Personal area networks can be wireless or constructed with cables. This may

include Bluetooth enabled devices or infra-red enabled devices. PAN has connectivity range

up to 10 metres.PAN includes wireless computer keyboard and mouse.

.2. (b)Rights security

Explanation: User can access only certain folders pertaining to his/her own work

3. (d)Fields

Explanation: A field is a segment of information that when grouped with other related

segments, provides a detailed record for a specific object. A field, for example, would be

specific information regarding the employee, perhaps the employee's name, hire date or social

security number.

. 4. (c) Wireless media

Explanation: They do not use cables instead the signals are transmitted using Bluetooth,

infrared, microwave or radio wave.

5. (b)Ring topology

Explanation: In this topology, it forms a ring connecting a devices with its exactly two

neighboring devices.


1. (b) MAN

Explanation: A metropolitan area network (MAN) is a network with a size greater than

LAN but smaller than a WAN. Network size generally ranges from 5 to 50 km. It may be as

small as a group of buildings in a campus to as large as covering the whole city.

2. (a)2 GB

Explanation: OLE objects can store pictures, audio, video, or other BLOBs (Binary Large

Objects) Up to about 2 GB.

3. (d) Status Bar

Explanation: It displays information about the current object or view.

4. (c) Wireless media

Explanation: They do not use cables instead the signals are transmitted using Bluetooth,

infrared, microwave or radio wave.

5. ( c) Hybrid topology

Explanation:. This topology is a collection of two or more topologies .It is reliable one but

at the same time it is costly topology

SUBJECT: MATHS

SOLUTIONS

Date:11.05.2020

1. Ans: ( c) 1

Sol: Divisibility test 3, if the sum of all the digits are divisible by 3 then the number is

divisible by 3. So, x = 1

2. Ans: (a) 3

Sol: Divisibility test 9, if sum of all the digits are divisible by 9 then the number is

divisible by 9. So, x = 3

3. Ans: (a) A = 7, B = 6

Sol: By addition

4. Ans: (c) -6

Sol: Here numerical coefficient is -6

5. Ans: (c) 5

Sol: To find the degree,we have to add the exponents of all the terms of the

expression,which is the highest power of the term in that expression, that is the degree

.

Date: 12.05.2020

1. Ans: (a)

Sol: Using formula: -

So

Where, a = 5, b = -7, c = 9

2. Ans: (a) Z + 4

Sol: = Z + 4

3. Ans: (a) x (x + 3)

Sol: =

4. Ans: (c) -4

Sol: X = - 1, then 1 - 5 = - 4

5. Ans: (b) X + Y + Z

Sol: = X +Y + Z

___________________________________________________________________________

______

Date: 13.05.2020

1. Ans: (a)

2. Ans: (d) Since, Volume = l*b*h =

3. Ans (c) Since

4. Ans (c) After putting the value of x = 1 in the given equation, the resultant is 4

5. Ans (d)

Date: 14.05.2020

1. Ans (b) Taking a and c common by forming groups of first 2 terms and the last 2

terms, we get

2. Ans (d) Taking a common from the two terms we get

3. Ans (a)

4. Ans (b) Since

5. Ans (a) 2, Divisibility rule of 11 states that the if we subtract the sum of digits in even

positions and the sum of digits in odd positions, if we get 11 or 0 then the number is

divisible by 11.

Hence,

x = 2

Date:15.05.2020

1. Ans (c) Since -4/3 = -1.33 which lies between -1 and -2

2. Ans (a) -6,

3. Ans (b) 1, Since

4. Ans (b) 1/4, Since -5/4 + 1/4 = -4/4 = -1, Hence

5. Ans (a)

Date:16.05.2020

1. Ans (b) 625, Since

2. Ans (c) 3, Since

3. Ans (d) 1, Since , Since 30 just has one zero, Hence.

4. Ans (c) 64/225, Since Hence

5. Ans (b) 9, Since

SUBJECT: PHYSICS

ANSWER TO ASSIGNMENT /CLASS 8/PHYSICS/ 11-05-2020

1. ( d) speed

Explanation: A force applied on an object may change its speed. If the force

applied on the object is in the direction of its motion the speed of the object

increases. If the force is applied in the direction opposite to the direction of motion

then its result in a decrease in the speed of the object.

2. (c) zero

Explanation:The force on an object is zero if the two forces acting on it in opposite

direction are equal in magnitude .This kind of force is called balanced force.

3. (a) muscular force

Explanation: Because the archer has to touch the bow in order to pull it .

4. (d) electrical force

Explanation: Because it is a non contact force.

5. (b)Heating

Explanation: Because heating is a form of energy

.ANSWER TO ASSIGNMENT /CLASS 8/PHYSICS/ 12-05-2020

1. (a)nature of surface of contact

Explanation :Because if the object has irregularities on its surface i.e. the surface is

rough then the force of friction would be more .If there are no irregularities on the

surface i.e. the surface is smooth then the force of friction decreases.

2. (b)Force of friction< applied force

Explanation: Force applied is greater than the maximum frictional force offered by

the surface .In this case body will move in the direction of force applied.

3. (a) weight

Explanation: All liquid have weight .The pressure exerted by a liquid is small just

under the surface of the liquid. But as we go deeper in a liquid the pressure in a liquid

increases. As the depth of liquid increase the weight of liquid column pushing down

from above increases and hence pressure increases.

4. (b) the cross sectional area of the reservoir

Explanation:The pressure of water near bottom of the dam forming a dam depends

on the depth of water, density of water and atmospheric pressure whereas its is

independent of the cross sectional area of the reservoir.

5. (a) Space

Explanation:Friction caused by things in physical contact with each other ,is largely

absent in space .Space is almost totally empty, so there is no road for the space to rub

against .There is no air resistance in space because there is no air in space.

ANSWER TO ASSIGNMENT /CLASS 8/PHYSICS/13-05-2020

1. (b) decrease

Explanation: Because as the object moves across the rough surface it decelerates due

to friction. This will reduce the speed of the object until it has completed its course

over rough surface .

2. (d)all above these

Explanation: Friction is a force which opposes the relative motion between the

surface .Its acts equal to the applied force until reaches its limiting value after that

limiting value acts.

3. (a)Change of position

Explanation: Magnet exert forces and torques on each other due to the rules of

electromagnetism

4. (a) Parallel to the contact surfaces

Explanation: Frictional force always acts parallel to two planes in contact with each

other and in a direction opposite to that of relative motion of the two bodies.

5. (C) Becomes 4 times

Explanation :

P= F/A

F’=2F

A’ =A/2

P’=2F/A/2=4 (F/A )

P’=4P


1. (d) both ‘b’ and ‘c’ are correct.

Explanation: Because muscular force is applied by us.

2. (a) to increase the supporting area .

Explanation: by doing this they increase the area of contact of the load with their

head .So the pressure in their head is reduced and they find it easier to carry the load.

3. (b)kicking a football

Explanation: while applying force on the football the ball will move any direction.

4. (c) the combination of forces acting on it balances each other.

Explanation: parallel equal forces acting in opposite direction in the same line of

action.

5. (a)by its magnitude

Explanation :The magnitude of force is expressed in the SI unit of force called

Newton.


1. ( d ) the sum of all the forces is zero

Explanation: there is no external force acting on boat

2. ( b ) downward

Explanation: due to its mass

3. ( d) contact force

Explanation:In performing the tasks he uses muscular force and muscular force can

be applied only when it is in contact with an objects.

4. ( d) increases frictional force

Explanation: because truck and buses carry heavier load / more weight it therefore

means it requires more traction/ friction with ground to move the load efficiently and

effectively.

5. ( a ) gravitational force and frictional force

Explanation: because these two forces affect many motions on Earth .


1. ( a ) 2 N

Explanation : FNet = F1 – F2

= 10 N – 8 N = 2 N

2. ( a ) does not move

Explanation :because resultant force is zero.

3. ( b ) moves to east direction

Explanation : because F1 >F2

4. ( a ) O N

Explanation : because resultant force is zero

10 10 N

5. ( a ) O N

Explanation : because resultant force is zero

SUBJECT: CHEMISTRY

ANSWER TO ASSIGNMENT /CLASS 8/CHEMISTRY/ 11-05-2020

1. (D) Brittle

Explanation: metals are lustrous, ductile, malleable, and good conductors of

electricity, while nonmetals are generally brittle (for solid nonmetals), lack lustre,

and are insulators.

2. (B) Electrical conductivity

Explanation: Electric conductivity is the movement of electrically charged particles.

All metals conduct electricity to a certain extent, but certain metals are more highly

conductive. The most highly conductive metals are silver, copper, and gold. Copper

3. (C)Lithium

Explanation: The lightest or least dense metal that is a pure element is lithium,

which has a density of 0.534 g/cm3. This makes lithium nearly half as dense as water.

4. (A) Brittle

Explanation: Sulphur is a nonmetal. It cannot be drawn into wires or changed into

sheets. It is very soft and hence, is brittle in nature.

5. (C) Si

Explanation: Silicon is neither metal nor non-metal; it's

a metalloid, metalloids generally have properties of both metals and nonmetals


1. (B) Si

Explanation: Silicon is in - between metals and non metals. it shows both the

properties of metals and non metals. Hence, it is called a metalloid or semi

conductor.

2. (B) Reflect light

Explanation: Objects reflect light differently can be attributed to a property

called 'luster. ' Luster is a property that describes how light is reflected on the

surface of a mineral.

3. (B) Magnetic

Explanation: Magnetic alloys have become common, especially in the form of

steel (iron and carbon), alnico (iron, nickel, cobalt, and aluminum), and permalloy

(iron and nickel). The strongest magnetic element is iron, which allows items made out of

these alloys to attract to magnets.

4. (A) Light

Explanation: Non-metals vary greatly in appearance. They do not have lustre. As it does

not have any free electrons light falling on non-metals does not reflect and hence non-

metals are not shiny. Hence, they have a very dull appearance.

5. (B) Metalloid

Explanation: Elements that have properties of both metals and nonmetals are

called metalloids. They can be shiny or dull and their shape is easily changed.

Metalloids typically conduct heat and electricity better than nonmetals but not as

well as metals.


1.(B) It is a good conductor of electricity

Explanation: It has high electrical conductive; it's inexpensive; it's ductile; and it's

thermal resistant.

2. (B) Because the bonding between metal atoms is strong and cannot break

Explanation: Metals are malleable. This means that they can be hammered or

pressed into different shapes without breaking. They are also ductile, which means

that they can be drawn out into thin wires without breaking.

In each case, we are changing the shape of the metal without cracking or breaking it.

This is possible because the metallic bonds are strong but not directed between

particular ions.

3. (A) Metals

Explanation: Metals will have a high melting point, solid at room temperature,

malleable, ductile and sonorous

4. (D) piece of coal

Explanation: non – metals are brittle in nature.

5. (C) metalloid

Explanation: silicon has the intermediate characteristics of metal and

non metals.


1. (B) All metals are hard and strong

Explanation: Sodium and potassium are soft and can be cut with a knife.

2. (C) x = pencil lead , Y = wooden block

Explanation: pencil lead is good conductor of electricity but wooden block

do not conduct electricity

3. (D) iron

Explanation: Metals are malleable. This means that they can be hammered or

pressed into different shapes without breaking.

4. (C) tooth pick

Explanation: tooth pick is made up of wood so it does not conduct

electricity

5. (D) brittle

Explanation: Sulphur is a nonmetal. It cannot be drawn into wires or changed into

sheets. It is very soft and hence, is brittle in nature.


1. (A) Metal

Explanation: Because malleability and ductility are the properties of metal.

2. (C) Silicon

Explanation: silicon has the intermediate characteristics of metal and

non metals.

3. (B) An exposed iron rod

Explanation: It occurs when Iron, Oxygen and Water (air moisture) When

they combine, the iron loses electrons to oxygen atoms. This is called oxidation

and when it happens it produces a chemical reaction forming Fe203 Iron Oxide

otherwise known as Ferric Oxide, or more commonly known as rust.

4. (C) An alloy

Explanation: An alloy is a homogeneous mixture of two or more metals or

a metal and non-metal.

5. (D) Helium

Explanation: The gases like hydrogen and helium are used in

the balloons because they are lighter than the air. But helium is more preferable

than hydrogen because helium is non-combustible and that's why it is more safe to

use.


1. (C) Chlorine

Explanation: Chlorine is used to sterilize drinking water supply and the water

in swimming pool. This because chlorine kills the germs and bacteria present in

water and makes the water fit for consumption. Chlorine is the non metal which is used to

disinfect the water.

2. (C) Pb

Explanation: lead, is widely used because it is very dense, thereby providing a

high amount of mass and thus, kinetic energy for a given volume very high. The

heavy lead core delivers its kinetic energy to the target.

3. (B) C

Explanation: This stable network of covalent bonds and hexagonal rings is the

reason that diamond is as incredibly strong as a substance. Diamond and Graphite

and Diamond and graphite are two allotropes of carbon — pure forms of the

same element that differ in structure.

4. (B) Iodine

Explanation: Iodine is a non-metal which is used to make purple- coloured

solution called tincture iodine which is applied on cuts and wounds as an antiseptic.

5. (C) Argon

Explanation: There is no vacuum in the electric bulb. On the contrary, argon

gas or argon gas mixed with a little nitrogen is filled in the bulb under some

pressure. Argon increases bulb life by preventing the tungsten filaments from

deteriorating too quickly. Helium is used in lighting of the bulb.

SUBJECT: BIOLOGY

ANSWER TO ASSIGNMENT/ BIOLOGY /CLASS VIII/DATE:11.05.2020

1. (a) Microbiology

Explanation: The study of microorganisms is called microbiology.

2. (a) Thiomargarita namibiensis

Explanation: Thiomargarita namibiensis is a Gram-negative coccoid Proteobacterium,

found in the ocean sediments of the continental shelf of Namibia. It is the largest

bacterium ever discovered, as a rule 0.1–0.3 mm (100–300 μm) in diameter, but

sometimes attaining 0.75 mm (750 μm).

3. (a) Virus

Explanation: Viruses are non-living things outside the body of any organism but

reproduce once it enter in a host. That is why they are considered as link between

living and non-living.

4. (d) Antonie van Leeuwenhoek

Explanation: Antonie van Leeuwenhoek is considered a father of microbiology as he

observed and experimented with microscopic organisms in 1676, using simple

microscopes of his own design.

5. (a) Euglena

Explanation: The Phytomastigophorea includes chlorophyll-

containing protozoans that can produce their food photosynthetically, as do plants—

e.g., Euglena and dinoflagellates.


1. (a) Fermentation

Explanation: Fermentation is a metabolic process in which an organism converts a

carbohydrate, such as starch or a sugar, into an alcohol or an acid.

2. (a) Armillaria mellea

Explanation: It is a plant pathogen and part of a cryptic species .

3. (c) Edward Jenner

Explanation: Jenner was the pioneer of the smallpox vaccine, as his experiments

opened the pathway of the discovery of the immune system. He observed the immune

capabilities by injecting pus of an infected person to a healthy host.

4. (b) Antibiotics

Explanation: Antibiotics are medicines that help stop infections caused by bacteria.

They do this by killing the bacteria or by keeping them from copying themselves or

reproducing.

5. (a) Bacteria

Explanation: Animal proteases and microbial proteases from bacteria is used in the

pre-tanning processes of leather manufacture.


1. (b) Growth of yeast cells

Explanation: Bread rises because yeast eats sugar and burps carbon dioxide, which is

trapped by the bread's gluten.

2. (b) Streptomycin

Explanation: Antibiotics are medicines that help stop infections caused by bacteria.

They do this by killing the bacteria or by keeping them from copying themselves or

reproducing.

3. (c) Cholera

Explanation: Cholera is an infectious disease that causes severe watery diarrhoea,

which can lead to dehydration and even death if untreated. It is caused by eating food

or drinking water contaminated with a bacterium called Vibrio cholerae.

4. (c) Malaria

Explanation: Malaria is caused by the Plasmodium parasite.

5. (d) B & D

Explanation: Rhizobium and blue green algae increases the fertility of the soil by

nitrogen fixation.


1. (d) Protozoa

Explanation: Protozoa is an informal term for single-celled eukaryotes, either free-

living or parasitic, which feed on organic matter such as other microorganisms or

organic tissues and debris.

2. (a)Bacteria

Explanation: Bacteria is used in jute industry for separating jute fibres from the stem.

3. (a) Blue green algae

Explanation: A few living organisms are able to utilize molecular N2 gas from the

atmosphere. The best known of these are the symbiotic Rhizobia (legume bacteria),

non-symbiotic free-living bacteria such as Azotobacter and Clostridium, and blue-

green algae.

4. (b) Vitamin B complex

Explanation: Yeast is an important source of Vitamin B Complex. It is also known as

invertase. It is best for the body growth, and helps in making your body stronger from

inside.

5. (c) Bacteria

Explanation: Biological treatments rely on bacteria, nematodes, or other

small organisms to break down organic wastes using normal cellular processes.


1. (d) Bacteria

Explanation: A type of bacterium called Mycobacterium tuberculosis causes

Tuberculosis (TB). Its spread when a person with active TB disease in their

lungs coughs or sneezes and someone else inhales the expelled droplets, which

contain TB bacteria.

2. (b) Louis Pasteur

Explanation: Proving the germ theory of disease was the crowning achievement of the

French scientist Louis Pasteur.

3. (b) Kitasato shibasaburo

Explanation: He became the first person to grow the tetanus bacillus in pure culture,

and in 1890 cooperated with Emil von Behring in developing a serum therapy

for tetanus using this pure culture.

4. (c) Electron microscope

Explanation: Long after optical microscopes have reached their limit, the

electron microscope goes on magnifying up to 200,000 times was discovered.

5. (b) Anaerobic bacteria

Explanation: Organisms capable of producing methane have been identified only from

the domain Archaea, a group phylogenetically distinct from both eukaryotes and

bacteria, although many live in close association with anaerobic bacteria.


1. (b) Trichonympha

Explanation: Trichonympha have the enzymes needed to convert cellulose in wood

into starches and sugars that the termite can use as nutrients.

2. (d) Rhinovirus

Explanation: Many different types of viruses can cause common cold.

3. (d) Both A & B

Explanation: Microbial spoilage is caused by microorganisms like fungi (moulds,

yeasts) and bacteria. They spoil food by growing in it and producing substances that

change the colour, texture and odour of the food.

4. (a) Vaccine

Explanation: Vaccines are made from microbes that are dead or inactive so that they

are unable to cause disease.

5. (a) Protozoa

Explanation: ‘Pro’ means primitive and ‘zoa’ means animal thus called as first

animal.

SUBJECT- HISTORY/CIVICS

DATE - 11-05-2020

1. (b) Warren Hastings

Explanation:- Warren Hastings propagated the policy of paramountcy.

2. (c) Presidencies.

Explanation: British had divided their territories into administrative units called

Presidencies.

3. (b) Calcutta

Explanation: the Sardar Nizamat Adalat was set up in Madras.

4. (b) 1773

Explanation: A new Supreme Court was established under the regulating act of 1773.

5. (d)63%

Explanation: By 1857 the Company had 63% of Indian Territory under its direct rule.

ANSWER TO ASSIGNMENT

DATE - 12-05-2020 CLASS – VIII SUBJECT - HISTORY

1. (c) Trained Soldiers on horseback

Explanation:- Cavalry refers to Trained Soldiers on horseback.

2. (b) Holt Mackenzie

Explanation: The mahalwari settlement was introduced by Holt Mackenzie

3. (c)Ryotwari System

Explanation: Ryotwari system was the system under which settlement was made directly

with the cultivators.

4. (d) Paramountcy

Explanation: After capturing Afghanistan , Sindh , Maratha and Punjab the British claimed

their Paramountcy.

5. (b) Rani Chennamma

Explanation: Rani Chennamma led an Anti British resistance in Kittor, Karnataka.



1. (b) Lord Warren Hastings

Explanation:- Lord Warren Hasting was the first Governor General of India.

2. (a) 1849

Explanation: In 1849 , Punjab came under Company Rule.

3. (c) Village

Explanation: Mahal refers to Village.

4. (a) Cultivators

Explanation: Ryots were cultivators.

5. (a) Ryotwari

Explanation: Ryotwari system of land revenue is also termed as the Munroe System.



1. (a) Soil

Explanation:- Growing Indigo exhausted the soil.

2. (c)Less than 25%

Explanation: Land producing Indigo under Nij cultivation remained less than 25%.

3. (c) Industrial Revolution

Explanation: Britain’s cotton production rose dramatically due to Industrial revolution.

4. (d) Bengal

Explanation: 95% of the Indigo import into Britain, came from Bengal.

5. (c) Mahalwari

Explanation: Under Mahalwari settlement the village headman had the responsibility of

collecting the revenue.



1. (b) High Revenue

Explanation:- All new land system failed due to high revenue

2. (c) Zamindars

Explanation: Under permanent settlement the rajahs were recognized as Zamindars.

3. (d) South India

Explanation: Munroe system was extended all over South India.

4. (a) 10 Million

Explanation: In Bengal famine, about 10 million people died.

5. (b) 2 ploughs

Explanation: For every one bigha of indigo cultivation they require 2 ploughs.



1. (b) 2

Explanation:- There are 2 main system of Indigo Cultivation.

2. (c) 18th century

Explanation: Indigo cultivation expanded rapidly in Bengal during 18th century.

3. (c) Both (a) & (b)

Explanation: The Mahalwari, Ryotwari, Zamindari are different system of Land Settlement

and Land Revenue.

4. (d)Heavy guns used by the infantry.

Explanation: Muskets refer to heavy guns used by infantry.

5. (a) 1830

Explanation: Rayanna, was caught and hanged by the British in 1830.

SUBJECT: GEOGRAPHY

DATE:11/5/2020 CLASS:8 SUB:GEOGRAPHY

1. D- Terraced agriculture

Explanation- Terraces are made on mountains to slow down the flow of rainwater and help to reduce soil erosion.

2. C- Pesticides

Explanation- Harmful chemicals are present in pesticides which led to soil erosion.

3. C- Pron to flooding

Explanation- During flood heavy flow of water washed away the soil therefore rock dams are made to stop soil erosion.

4. A- Exposed

Explanation- Grass roots hold the top soil but due to over grazing cause soil erosion.

5. A- Slow down the speed of the wind

Explanation- In coastal areas wind blows fastly and washed away the top soil therefore tall trees are planted to slow down the speed

DATE:12/5/2020

1. C- B-horizon

Explanation- Sub - soil is formed after weathered rock .

2. B- sheet erosion

Explanation- Sheet of top soil in hilly areas, washed away with the flow of water.

3. A- Soil fertility

Explanation- It helps to regain the fertility of the soil.

4. C- Lithospeheric zone

Explanation- It is the solid part of the earth and soil is only formed in this layer.

5. A- Layers

Explanation- Due to weathering of rocks, soil is fo3in layers and is not formed at a time.

ANSWERS TO ASSIGNMENT

DATE:13/5/2020

1. B-Decayed organic material

Explanation- Dead plants and animals are decomposed and converted into fertile material called humus.

2. B- (A-horizon )

Explanation- This zone carries fertile organic material called humus.

3. D-

Explanation- Humus is made up of plants and animals which contains the fertile organic material.

4. B- Horizon

5. A- Parent material

Explanation- soil is formed by weathering of rocks and are in layers.

DATE:14/5/2020

1. C- Leaching

Explanation- Due to heavy rainfall top soil washed away which contains the fertility of the soil.

2. All of the above

Explanation- Weathering, time and climate determine the soil type.

3. D- Soil conservation

Explanation- due to soil erosion soil become unfit for cultivation so it is necessary to conserve soil

4. C- Humus

Explanation- humus is made up of decayed plants and animals.

5. A- Splash erosion

Explanation- heavy rainfall easily washed away bare soil .

ANSWERS TO ASSIGNMENT

DATE:15/5/2020

1. D- (C-Horizon)

Explanation- above bed rocks this layer is formed after weathering .

2. C- Time

Explanation- soil is formed in layers therfore with the course of time the thickness will increase

3. B- over use of ground water

Explanation- to full fill the demand of water and food of growing popultion

4. A- Wind erosion

Explanation- In desert areas due to lack of vegetation, wind blows fastly and cause soil erosion.

5. B- contour ploughing

Explanation- In hilly areas ploughing is done along the contours of the land in order to minimize soil erosion.

DATE:16/5/2020

1. C- ( O- horizon )

Explanation- this is the top layer of the soil which contains humus.

2. D-types of weathering

Explanation- soil is formed in which depends upon speed and types of weathering.

3. A- weathered zone

Explanation- this is the first stage of soil formation.

4. D- wind erosion

Explanation- In desert and coastal areas, wind erosion is caused due to high speed winds

5. C- ( B-horizon)

Explanation- due to heavy rainfall top soil leached to sub soil/B-horizon as it is below A-

horizon.

वस्तुनिष्ठ प्रश्िों के उत्तर

दिि ांक--17-5-2020

Day 1

दिि ांक 11/5/2020

प्रश्ि 1-उत्तर क

भ ष के िो भेि होते हैं-- लिखित, मौखिक।

प्रश्ि 2-उत्तर घ

दहांिी भ ष को िेवि गरी लिपि में लििते हैं।

प्रश्ि 3-उत्तर ग

व्य करण को च र भ गों में ब ांटते हैं- उन्हें चरण कहते हैं।

प्रश्ि 4- उत्तर ि

जोड़ िहीां धरती िर इसक ।


करुण क अर्थ िय है।

Day 2

12/5/2020

प्रश्ि 1-उत्तर ि

पवघ्ि शब्ि क अर्थ िरेश निय ां य रुक वटें हैं।

प्रश्ि 2- उत्तर ग

ग ांजे मधुमय ग ि कभी रे्।

प्रश्ि 3- उत्तर क

भ रत म त हमें अन्ि,अमतृ िेती है।

प्रश्ि4- उत्तर क

पवहग क िय थयव ची शब्ि िक्षी है।


धरती क िय थयव ची शब्ि क्षक्षनत है।

Day 3

13/5/2020

प्रश्ि1- उत्तर ग

क्रय क पविोम शब्ि पवक्रय है।


अिुिस्स्र्त क पविोम शब्ि उिस्स्र्त है।

प्रश्ि3 उत्तर ि

अिुक ि क पविोम शब्ि प्रनतक ि है।

प्रश्ि 4 उत्तर क

उत्तीणथ क पविोम शब्ि अिुत्तीणथ है।

प्रश्ि 5 उत्तर ि

जड़ क पविोम शब्ि चेति है।

Day 4

14/5/2020

प्रश्ि1 उत्तर ि

किक क िय थयव ची शब्ि सोि है।


नतलमर क िय थयव ची शब्ि अांधक र है।

प्रश्ि3--उत्तर ि

िैत्य क िय थयव ची शब्ि ि िव है।

प्रश्ि 4 उत्तर घ

अनतथर् क िय थयव ची शब्ि अभ्य गत है।

प्रश्ि 5 उत्तर घ

तरणी क िय थयव ची शब्ि िौक है।

Day 5

15/5/2020


अनतवसृ्ष्ट क पविोम शब्ि अि वसृ्ष्ट है।


उत्र् ि क पविोम शब्ि िति है।


अिुज क पविोम शब्ि अग्रज है।

प्रश्ि 4 उत्तर ग

िरतांत्र क पविोम शब्ि स्वतांत्र है।


अमतृ क पविोम शब्ि पवष है।

Day 6

16/5/2020


मह ि शब्ि क भ वव चक सांज्ञ मह ित है।

प्रश्ि 2-उत्तर ग

करुण शब्ि क भ व व चक करुण है।


पवपवध क भ वव चक पवपवधत है।

प्रश्ि 4- उत्तर ग

म िव क भ वव चक म िवत है।

प्रश्ि 5; उत्तर घ

कििी शब्ि क अर्थ केि है।

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