Pick the synthetic fibre out of the following.

1

(a)

Cotton

(b)

Nylon

(c)

Jute

(d)

Wool

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

1

(a)

Non-reactive

(b)

Light in weight

(c)

Durable

(d)

Good conductor of electricity

Which of the following is non-biodegradable?

1

(a)

Paper

(b)

Cotton cloth

(c)

Plastic

(d)

Wood

The synthetic fibres are also known as ................fibres.

1

(a)

man-made

Peels of vegetables and fruits are......

1

(a)

biodegradable

Cotton is........... fibre.

1

(a)

natural

Bakelite is.......... plastic

1

(a)

thermosetting

Artificial fibres are stronger than natural fibres.

1

(a) False

(b) True

PVC is thermosetting plastic.

1

(a) True

(b) False

Synthetic fibre do not melt on heating

1

(a) True

(b) False

Write the name of fibre which is the first fully synthetic fibre.

2

(a)

Which synthetic polymer can be used as a substitute for wool for making sweaters and shawls?

2

(a)

For making PVC pipes, which type of plastic (thermoplastic or thermosetting plastic) is used?

2

(a)

Should the handle and bristles of a toothbrush be made of the same material? Explain your answer.

3

(a)

'Avoid plastics as far as possible'. Comment on this advise

3

(a)

Describe an activity to show that thermoplastic is a poor conductor of electricity

3

(a)

Nikita's mother went to the market to buy new lunch box for Nikita. She saw different lunch boxes made up of plastics as well as steel. Plastics lunch boxes of different colours was very attractive but the steel lunch box was very simple. Nikita's mother told him to select a lunch box for you. She selected a lunch box made of steel instead of plastic one. Her mother purchased the steel lunch box for him.
Read te following passage and answer the following questions.
(a) Why Nikita prefer steel lunch box instead of plastic one?
(b) Is plastic materials environment friendly? Explain.
(c) What values are shown by Nikita?

5

(a)