Synthetic Fibres and Plastics Test

Result

Synthetic Fibres and Plastics Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

Which fibre is obtained from flax seeds?

A
Cotton

B
Jute

C
Linen

D
Nylon
Solution
- Nylon is a synthetic fibre. So, it is not obtained from flax seeds.
- Cotton fibre is obtained from cotton plant and jute fibre is obtained from jute plant.
- Linen fibre is obtained from flax seeds. So, option C is correct answer.
Question 2
1 / -0

Which of these fibres is non - biodegradable?

A
Cotton.

B
Jute.

C
Wool.

D
Nylon.

Solution

Nylon fibre is non - biodegradable as it is synthetic fibre.
Question 3
1 / -0

Padma observes that screwdrivers have a plastic handle and electrical wires have a plastic covering. What is the reason for the use of plastic in electric appliances?

A
It is strong and durable

B
It is hard

C
It is non-reactive

D
It is a poor conductor

Solution

Electric screwdrivers and electrical wires have plastic covering because plastic is a poor conductor of electricity or a good insulator and therefore prevents an electric shock.
Question 4
1 / -0

Rayon is different from synthetic fibres because

A
it has a silk-like appearance

B
it is obtained from wood pulp.

C
its fibres can also be woven like those of natural fibres.

D
none of the above

Solution

Rayon is different from synthetic fibres because: it is obtained from wood pulp.Hence option (B) is correct.
Question 5
1 / -0

Which of the following statements is incorrect?

A
Nylon clothings can with stand high temperature and are, therefore, good to wear in summers.

B
Thermosetting plastics do not become soft on heating.

C
Addition polymers are formed without the elimination of byproduct molecules.

D
Natural rubber is obtained as latex from rubber trees.

Solution

Nylon clothes when subjected to high-temperature results in a chemical change, that cannot be reversed. nylon clothes can easily catch fire. Therefore, it is not good wear for summers.

Thermosetting plastics once cured cannot be reversed and becomes permanently rigid solid.

Addition polymers are formed by linking of monomers no by-product is eliminated.

The latex extracted from the rubber trees is treated to obtain natural rubber.

Hence, option A is correct.
Question 6
1 / -0

Which of the following is a correct statement(s)?

A
The process of making yarn from fibres is called spinning.

B
In this process, fibres from a mass of cotton wool are drawn out and twisted.

C
A simple device used for spinning is a hand spindle, also called takli.

D
Another hand operated device used for spinning is charkha.

E
All of the above

Solution

The process of making yarn from fibres is called spinning. In this process, fibres from a mass of cotton are drawn and twisted to bring the fibres together to form a yarn or thread. Spinning is done at home using simple devices like the hand spindle, or takli, and charkha. It is also done using machines. So, all the given statements are correct.
Question 7
1 / -0

Melamine are:

A
Thermosetting

B
Thermoplastic

C
Both A and B

D
None of these

Solution

Melamine are thermosetting plastics as on heating it can be moulded and reshaped.
Hence, option $$A$$ is correct.
Question 8
1 / -0

What kind of silk is Rayon?

A
Natural silk

B
Synthetic silk

C
Mulberry silk

D
None of the above

Solution

Rayon is obtained from wood pulp which is a natural raw material. But wood pulp has to be chemically processed to give rayon. Properties of rayon are similar to those of silk. So it is considered synthetic silk. Hence option B is correct.
Question 9
1 / -0

Shellac secreted by lac insects is:

A
Natural plastic

B
Natural resin

C
Natural elastic

D
Any of these

Solution

Shellac is a resin secreted by the female lac bug on trees in the forests of India and Thailand. So a natural resin.
Shellac is a natural bioadhesive polymer and is chemically similar to synthetic polymers, and thus can be considered a natural form of plastic.
It can be turned into a molding compound when mixed with wood flour and molded under heat and pressure methods, so it can also be classified as thermoplastic. So a natural elastic.

Hence, option $$D$$ is correct.
Question 10
1 / -0

Which of the following properties of synthetic plastic makes it the most convenient to use?

A
Good electrical conductor

B
Malleable

C
Light, strong and remouldable

D
Reactive

Solution

Platic is non-reactive, light, strong, easily mouldable. These properties of plastic make it convenient to use.
Option $$C$$ is correct.

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Synthetic Fibres and Plastics Test - 32

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Synthetic Fibres and Plastics Test - 32

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Question 1

Cotton

Jute

Linen

Nylon

Solution

Question 2

Cotton.

Jute.

Wool.

Nylon.

Solution

Question 3

It is strong and durable

It is hard

It is non-reactive

It is a poor conductor

Solution

Question 4

it has a silk-like appearance

it is obtained from wood pulp.

its fibres can also be woven like those of natural fibres.

none of the above

Solution

Question 5

Nylon clothings can with stand high temperature and are, therefore, good to wear in summers.

Thermosetting plastics do not become soft on heating.

Addition polymers are formed without the elimination of byproduct molecules.

Natural rubber is obtained as latex from rubber trees.

Solution

Question 6

The process of making yarn from fibres is called spinning.

In this process, fibres from a mass of cotton wool are drawn out and twisted.

A simple device used for spinning is a hand spindle, also called takli.

Another hand operated device used for spinning is charkha.

All of the above

Solution

Question 7

Thermosetting

Thermoplastic

Both A and B

None of these

Solution

Question 8

Natural silk

Synthetic silk

Mulberry silk

None of the above

Solution

Question 9

Natural plastic

Natural resin

Natural elastic

Any of these

Solution

Question 10

Good electrical conductor

Malleable

Light, strong and remouldable

Reactive

Solution

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