Synthetic Fibres and Plastics Test

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Synthetic Fibres and Plastics Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

Match the following with the correct answers.
(a) Scouring (i) Yields silk fibers
(b) Mulberry leaves (ii) Cleaning sheared skin
(c) Sheep (iii) Food of silk worm.
(d) Cocoon (iv) Wool yielding animal.

A
a --> ii, b--> iii, c--> iv, d--> i

B
a--> i, b--> ii, c--> iii, d--> iv

C
a--> iv, b--> iii, c--> ii, d--> i

D
a--> ii, b--> i, c--> ii, d--> iv

Solution

(a) Scouring means cleaning the sheared skin of animals.
(b) Silkworms feed on mulberry leaves
(c) Sheep gives us wool
(d) Cocoon gives us silk fibres

Hence, the answer is A
Question 2
1 / -0

Which of the following is not a thermoplastic?

A
PVC

B
Polythene

C
Melamine

D
Teflon

Solution

Melamine is a thermosetting plastic whereas PVC, polythene and Teflon are thermoplastics.
Question 3
1 / -0

__________ is not a natural fiber.

A
rayon

B
silk

C
wool

D
cotton

Solution

Rayon is a synthetic fiber, which means it is made by humans.
Silk is obtained from silk worm, wool is from sheep and cotton from plants hence these are natural fibers.
Option $$A$$ is correct.
Question 4
1 / -0

Acrylic, a man made fibre is a good substitute of a natural fibre. Which is this natural fibre?

A
Wool

B
Silk

C
Cotton

D
Jute

Solution

Acrylic is a man-made fibre. It is also called artificial or synthetic wool as it resembles natural wool. But, it is cheaper than natural wool.
Question 5
1 / -0

Thermoplastic among these is?

A
Bakelite

B
Melamine

C
Acrylic

D
None of these
Solution
- Examples of thermoplastics are polythene and PVC.
- Melamine and bakelite on the other hand are thermosetting plastics.
- Acrylic is not a plastic. It is a synthetic fibre.
Question 6
1 / -0

The thermosetting plastic among these is:

A
PVC

B
bakelite

C
teflon

D
nylon

Solution

From the given options, bakelite is a thermosetting plastic. PVC is a thermoplastic. Teflon is also a thermoplastic. Nylon is a synthetic fibre used to make curtains, clothes, socks, ropes, etc.
Question 7
1 / -0

If the plastics are hard, become soft and readily workable by the addition of certain compounds called:

A
Catalysts

B
Telomers

C
Plasticisers

D
Vulcaniser

Solution

A catalyst is a substance that can be added to a reaction to increasing the reaction rate without getting consumed in the process.

A telomere is a region of repetitive nucleotide sequences at each end of a chromosome.

Plasticizers are used to convert PVC, a rigid plastic, into a soft, flexible, and elastic material.

Vulcaniser is someone who vulcanizes rubber to improve its strength

So, if the plastics are hard, become soft and readily workable by the addition of certain compounds called plasticizers.

Hence, option $$C$$ is correct.
Question 8
1 / -0

The most suitable material for the preparation of handles of cooking utensils is

A
Polythene

B
PVC

C
Nylon

D
Bakelite

Solution

Bakelite is the most suitable object to prepare handles of cooking utensils. Bakelite is a bad conductor that is why it is more suitable.
Thus, correct answer is option D.
Question 9
1 / -0

The example of natural fibre is:

A
rayon

B
nylon

C
cotton

D
dacron

Solution

Among the given options, rayon, nylon and Dacryon are are synthetic polymers. i.e., man-made whereas cotton is the natural fiber that we get from cultivation.
$$\therefore$$ The correct answer is $$C$$.
Question 10
1 / -0

These are generally the bad conductor of heat.

A
Natural fibre

B
Synthetic fibres

C
Cranes

D
Plastic

Solution

Materials that do not allow heat and electricity to pass through them are called insulators. Plastic is an insulator.
$$\therefore$$ Option $$D$$ is correct.

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Synthetic Fibres and Plastics Test - 33

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Synthetic Fibres and Plastics Test - 33

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Question 1

a --> ii, b--> iii, c--> iv, d--> i

a--> i, b--> ii, c--> iii, d--> iv

a--> iv, b--> iii, c--> ii, d--> i

a--> ii, b--> i, c--> ii, d--> iv

Solution

Question 2

PVC

Polythene

Melamine

Teflon

Solution

Question 3

rayon

silk

wool

cotton

Solution

Question 4

Wool

Silk

Cotton

Jute

Solution

Question 5

Bakelite

Melamine

Acrylic

None of these

Solution

Question 6

PVC

bakelite

teflon

nylon

Solution

Question 7

Catalysts

Telomers

Plasticisers

Vulcaniser

Solution

Question 8

Polythene

PVC

Nylon

Bakelite

Solution

Question 9

rayon

nylon

cotton

dacron

Solution

Question 10

Natural fibre

Synthetic fibres

Cranes

Plastic

Solution

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