Synthetic Fibres and Plastics Test

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Synthetic Fibres and Plastics Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statement is not true?

A
Fabric is made of yarn.

B
Jute is the outer covering of coconut.

C
Polyester is a synthetic fibre.

D
Silk fibre is obtained from silk worms.

Solution

The outer covering of coconut is called coir.
Hence, option B is correct.
Question 2
1 / -0

Synthetic fibers are obtained from which of the following?

A
Plants

B
sheep's

C
Chemicals

D
Jute

Solution

Synthetic fibers or artificially manufactured fibers were made from polymers obtained from petrochemicals. These fibers are called synthetic or artificial fibers. The two most common ones are nylon and polyester.
Therefore, the correct answer is option $$C$$.
Question 3
1 / -0

Bed sheets are made up of:

A
rayon and wool

B
rayon and plastic

C
rayon and nylon

D
rayon and cotton

Solution

Bedsheets are made by blended fibre i.e. a mixture of rayon and cotton. Rayon is a versatile fibre and is widely claimed to have the same comfort properties as natural fibres, although the drape and slipperiness of rayon textiles are often more like nylon. It can imitate the feel and texture of silk, wool, cotton and linen. The fibres are easily dyed in a wide range of colours.
Question 4
1 / -0

Which of the following is a disadvantage of nylon?

A
They do not shrink

B
They are less resistant to sun light

C
They are resistant to insects and molds

D
They can be easily dyed

Solution

Nylon fabrics have low resistance to sunlight.
They are not suitable for curtains or draperies as it is weakened by the exposure to sunlight.
Hence correct option is $$B$$.
Question 5
1 / -0

Polyester consists of :

A
repeating unit of ether

B
repeating unit of caboxylic acid

C
repeating units of ester

D
repeating unit of hydroxide

Solution

Polyester is a category of polymers that contain ester in their main chain.
Polyesters are used to make bottles, films, holograms, filters, dielectric film for capacitors, film insulation for wire, and insulating tapes.
Hence, the correct option is C.
Question 6
1 / -0

Which among the following is a poor conductor of heat and electricity?

A
Melamine

B
Bakelite

C
Both A and B

D
None of above

Solution

Bakelite is a thermosetting plastic which is one of the first plastics made from synthetic components. It's used for its electrical non-conductivity and heat-resistant properties in electrical insulators, radio, and telephone casings. Similarly, melamine resin is a thermosetting plastic used in high pressure decorative laminates, laminate floorings and dry erase boards.
Question 7
1 / -0

Which plastic is called a fire proof plastic?

A
Melamine

B
Bakelite

C
Teflon

D
Acrylic

Solution

Melamine is a poor conductor of heat and resists fire. Most of the synthetic fibers are poor conductors of heat and electricity. However, melamine can resist fire and can tolerate heat better than any other plastic material. Melamine is used for making floor tiles, kitchenware, and fabrics that resist fires.
Option $$A$$ is correct.
Question 8
1 / -0

The fibres of nylon is stronger than :

A
Steel wire of same thickness

B
Steel wire of different thickness

C
Plastic fibres

D
Rayon

Solution

Nylon is a synthetic fibre which has certain chemical properties which makes their fibres strong.
Question 9
1 / -0

Which of the following statement is true about thermosetting plastic?

A
It undergoes irreversible change during curing

B
It can melt and take shape only once

C
It cannot be recycled

D
All of above

Solution

Thermosetting plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. It can't be recycled. The cross-linking process eliminates the risk of the product remelting when heat is applied, making thermosetting ideal for high-heat applications such as electronic appliances.
Question 10
1 / -0

Which of the following statement is false about plastic?

A
Low thermal conductivity

B
They are highly reactive

C
Low ductility

D
Combustible

Solution

Plastic is non-reactive material. Hence, plastics are used in many packaging materials. Except for the property given in option B, all others are properties of plastic.
So, option B is the correct answer.

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Re-Attempt Weekly Quiz Competition

Synthetic Fibres and Plastics Test - 22

Result

Synthetic Fibres and Plastics Test - 22

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SHARING IS CARING

Question 1

Fabric is made of yarn.

Jute is the outer covering of coconut.

Polyester is a synthetic fibre.

Silk fibre is obtained from silk worms.

Solution

Question 2

Plants

sheep's

Chemicals

Jute

Solution

Question 3

rayon and wool

rayon and plastic

rayon and nylon

rayon and cotton

Solution

Question 4

They do not shrink

They are less resistant to sun light

They are resistant to insects and molds

They can be easily dyed

Solution

Question 5

repeating unit of ether

repeating unit of caboxylic acid

repeating units of ester

repeating unit of hydroxide

Solution

Question 6

Melamine

Bakelite

Both A and B

None of above

Solution

Question 7

Melamine

Bakelite

Teflon

Acrylic

Solution

Question 8

Steel wire of same thickness

Steel wire of different thickness

Plastic fibres

Rayon

Solution

Question 9

It undergoes irreversible change during curing

It can melt and take shape only once

It cannot be recycled

All of above

Solution

Question 10

Low thermal conductivity

They are highly reactive

Low ductility

Combustible

Solution

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