CBSE 8th Standard Science Synthetic Fibres and Plastics Sample Question Papers Study Material - QB365 Set D | QB365

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Published on: 29/10/2025

Question Set D

CBSE 8th Standard Science Synthetic Fibres and Plastics Sample Question Papers Study Material - QB365

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Std: 8th Standard CBSE - Science

chapter: Synthetic Fibres and Plastics - Sample Question Papers

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Questions:

Multiple Choice Question

15 x 1 = 15

Rolling friction is smaller than

(a)

sliding friction

(b)

static friction

(c)

fluid friction

(d)

All of these

The most conspicuous visible change that occurs in boys during puberty is

(a)

developmentin voice box

(b)

increase in height

(c)

production of sperms

(d)

increased sweating

Some mustard oil is kept in the beaker. It will exert pressure

(a)

upward

(b)

downward

(c)

sideways

(d)

in all the directions

Force due to the charged particles is known as

(a)

muscular force

(b)

magnetic force

(c)

electrostatic force

(d)

gravitational force

In humans, the development of fertilised egg takes place in the

(a)

ovary

(b)

testis

(c)

oviduct

(d)

uterus

The loudness of sound depends on

(a)

its amplitude

(b)

its time period

(c)

its frequency

(d)

its speed

Which statement is incorrect about endangered species?

(a)

Their number has decreased drastically

(b)

They might become extinct in the near future

(c)

They pose a danger to other animals

(d)

Their natural habitat needs to be protected

Identify the correct statement.

(a)

Tissue is a group of dissimilar cells

(b)

An organ consists of similar cells

(c)

Vacuoles are not found in plant cells

(d)

Prokaryotes do not have nucleus

The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is

(a)

copper

(b)

iron

(c)

aluminium

(d)

sodium

10.

Shyam was cooking potato curry on a chulha. To his surprise. he observed that the copper vessel was getting blackened from outside. It may be due to

(a)

proper combustion of fuel

(b)

improper cooking of potato curry

(c)

improper combustion of the fuel

(d)

burning of copper vessel

11.

Petroleum was formed from organisms

(a)

living on the land

(b)

living on the plants

(c)

living in the sea

(d)

living on the rocks

12.

Which of the following is not a common property of plastics?

(a)

Non-reactive

(b)

Light in weight

(c)

Durable

(d)

Good conductor of electricity

13.

Which of these do not have a regular cell structure?

(a)

Bacteria

(b)

Viruses

(c)

Protozoa

(d)

Algae

14.

Planting of seeds is called

(a)

cultivation

(b)

irrigation

(c)

harvesting

(d)

sowing

15.

Weeds are the

(a)

main crop plants

(b)

insects and pests

(c)

unwanted plants growing along the crop

(d)

chemical substances

1 Marks

10 x 1 = 10

16.

What are good conductors of electricity?

17.

What are multiple images?

18.

How are vehicles responsible for air pollution?

19.

A cell in the human body that receives and transfers messages.

20.

What is biodiversity?

21.

Attraction or repulsion between objects is which type of force?

22.

What happens when coal is heated in air?

23.

How is rayon formed?

24.

Who increases the number of friendly microbes?

25.

Where is the sprinkler water system useful?

Generic 2

4 x 2 = 8

26.

Write briefly about Rock paintings.

27.

Complete the following chemical reaction. Sulphur dioxide SO₂ + Water (H₂ O) ⟶ Is it an acid/base?

28.

How do some micro-organisms clean up the environment?

29.

How can a farmer increase the fertility of the soil?

Generic 3

4 x 3 = 12

30.

You have learnt the scientific facts about human reproduction. There are some myths and taboos regarding them. Explain few of them and discuss their solutions

31.

What is natural gas? What are the advantages of using CNG?

32.

Why do plastic containers seem most convenient?

33.

What is weeding? Why is it necessary?

Generic 5

1 x 5 = 5

34.

What are food preservatives? Explain some common food preservatives.

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Answers Key:

Multiple Choice Question

15 x 1 = 15

(d)
All of these

(d)
in all the directions

(a)
its amplitude

(b)
An organ consists of similar cells

10.

11.

12.

(d)
Good conductor of electricity

13.

(b)
Viruses

14.

(d)
sowing

15.

1 Marks

10 x 1 = 10

16.

()
The materials that allow electric current to pass through them are called good conductors of electricity.

17.

()
Images formed by mirrors placed at an angle to one another are called multiple images.

18.

()
Vehicles produce high level of pollutants such as carbon monoxide, carbon dioxide, nitrogen oxide and smoke

19.

()
Nerve cell

20.

()
Biodiversity refers to the variety of organisms existing on the earth, their inter-relationships and relationships with the environment.

21.

()
Magnetic

22.

()
When coal gets heated in air, it burns and produces mainly carbon dioxide gas.

23.

()
Rayon is obtained by chemical treatment of wood pulp.

24.

()
The loosened soil.

25.

()
Sprinkle water system is useful on the uneven land and at the land where water is not available. It is good for sandy soil.

Generic 2

4 x 2 = 8

26.

Rock paintings are found inside the Satpura National Park. These are evidences of prehistoric human life in these jungles. Figures of animals and men hunting, dancing and playing musical instruments are depicted in these paintings.

27.

SO₂ + H₂O ⟶ H₂SO₃ (Sulphurous acid)
It is an acid

28.

Some micro-organisms decompose the organic waste and dead plants and animals into simple substance and clean up the environment.

29.

Farmers can increase the fertility of the soil by :
(i) adding manure and fertilizers.
(ii) crop rotation.
(iii) leaving the field uncultivated in between two crops.

Generic 3

4 x 3 = 12

30.

There are myths and taboos regarding bodily changes that adolescents experience.
(i) A girl becomes pregnant if she looks at the boys during menstruation.
(ii) The mother is responsible for the sex of her child.

31.

Natural gas is a very important fossil fuel. It is stored under high pressure as compressed natural gas (CNG).
Advantage of CNG :
(i) It is easy to transport.
(ii) It does not produce any pollution.
(iii) No residue is left after burning of CNG.
(iv) It burns completely in the air.

32.

Plastic containers seem most convenient because of their light weight, lower price, good strength and easy handling.

33.

The process of removal of weeds is called weeding. Weeding is necessary, as weeds compete with crop plants for water, nutrients, space and sunlight. Thus, they affect the growth of crops. Some weeds can interfere in harvesting and may be poisonous. Thus, they must be removed.

Generic 5

1 x 5 = 5

34.

The chemical substances which are used to check or stop the growth of harmful micro-organisms in food are called food preservatives. These food preservatives keep the edible food materials protected from the invasion of micro-organisms which can spoil the food. Some common food preservatives are :
(i) Salt: Common salt is used to preserve meat, fish, amla raw mangoes, tamarind, etc.
(ii) Sugar: Jams, jellies and squashes are preserved by sugar. Sugar reduces the moisture content which inhibits the growth of bacteria, that can spoil food.
(iii) Oil: Edible oils are used as preservatives in vegetables and pickles. Oil does not allow the moisture to surface, thus preventing the growth of harmful bacteria.
(iv) Vinegar: It is used to preserve fruits, vegetables, fish, meat and pickles.