Synthetic Fibres and Plastics Test

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Synthetic Fibres and Plastics Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is considered as the first thermoplastic?

A
PVC

B
Polystyrene

C
Melamine

D
Celluloid

Solution

Celluloid, which is considered the first thermoplastic, made its appearance in the mid- $$1800s$$ and reigned in the industry for approximately $$100$$ years. During its peak production, it was used as a substitute for ivory. Today, it is used to make guitar picks.
Question 2
1 / -0

Plastic is a polymer consisting of:

A
synthetic monomers

B
semi-synthetic monomers

C
natural monomers

D
Both A and B

Solution

Plastic is a material consisting of synthetic or semi-synthetic organics that can be moulded into solid objects of diverse shapes. Plastics are typically organic polymers of high molecular mass, but they often contain other substances. They are usually synthetic, most commonly derived from petrochemicals.
Question 3
1 / -0

Which plastic is commonly used to make carry bags?

A
Polythene

B
Polyester

C
PET

D
Acrylic

Solution

Polyethene is a thermoplastic polymer consisting of long hydrocarbon chains. Polyethene or polythene is the most common plastic. Its primary use is in the packaging, making carry bags, plastic films, containers including bottles, etc.
Question 4
1 / -0

Which of the following statement is true about non-biodegradable materials?

A
They are safe for environment

B
The wastes are made up of synthetic material

C
They can be constantly reused

D
The wastes are made up of natural ingredients

Solution

Non-biodegradable materials are those which do not decompose by natural processes. Non-biodegradable materials are generally synthetic polymers. They are not safe for the environment. Natural fibres degrade very easily in nature. However, non-biodegradable materials are made up of synthetic materials which are not broken down by micro-organisms.
Question 5
1 / -0

Why are plastics difficult to biodegrade?

A
They are not environment friendly

B
Burning process is slow

C
They release lot of poisonous fumes

D
All of above

Solution

Plastic takes several years to decompose. It burns very slowly and also releases poisonous fumes which cause air pollution. The crucial manufacturing step turns petroleum into a material unrecognized by the organisms that normally break organic matter down.
Question 6
1 / -0

Why is plastic a poor conductor?

A
They are non-reactive

B
They can melt

C
They have high number of free electrons

D
They do not have free electrons

Solution

Conduction of heat and electricity requires free electrons. Plastics, whose molecules are made from long combinations of carbon and hydrogen atoms, have few or no free electrons.
Option D is correct.
Question 7
1 / -0

Why is plastic used in covering of electrical appliances?

A
It is a good conductors of heat

B
It is a good conductor of electricity

C
It is a poor conductor of electricity

D
None of above

Solution

Plastic is a poor conductor of electricity.
This makes it suitable to use as a coating for electric wires and in many other electrical appliances.
Hence, the correct option is $$C$$.
Question 8
1 / -0

What is recycling?

A
Burning of material

B
Breakdown of material by natural processes

C
Recovering and reprocessing materials into useful products

D
Burying products

Solution

Recycling means reprocessing waste material to make it useful again. For example, plastic recycling is the process of recovering scrap or waste plastic and reprocessing the material into useful products, sometimes completely different in form from their original state.
Question 9
1 / -0

Which of the following item cannot be recycled?

A
Plastic milk bottles

B
Plastic food trays

C
CD/DVD cases

D
Plastic cups

Solution

Plastic containers are relatively dense and compact which enables them to be easily sorted mechanically into the different types of plastics. Plastic film and bags are not easily mechanically sorted making them very costly to sort. Also, recycling such plastic is an expensive process.
CVD/DVD cases are made up of thermosetting polymers which cannot be recycled.
Option C is correct.
Question 10
1 / -0

Handles of most pans are made up of ____.

A
metals

B
plastic

C
Both A and B

D
None of the above

Solution

Metals are good conductors of heat as well as heavy. So, a pan with a metal handle would be hot while cooking. Also, it would mean that the pan would become very heavy.
Plastic on the other hand, is light and a bad conductor of heat. So, a plastic handle would not become as hot.
Hence, option B is correct.

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Re-Attempt Weekly Quiz Competition

Synthetic Fibres and Plastics Test - 23

Result

Synthetic Fibres and Plastics Test - 23

Score

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Rank

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SHARING IS CARING

Question 1

PVC

Polystyrene

Melamine

Celluloid

Solution

Question 2

synthetic monomers

semi-synthetic monomers

natural monomers

Both A and B

Solution

Question 3

Polythene

Polyester

PET

Acrylic

Solution

Question 4

They are safe for environment

The wastes are made up of synthetic material

They can be constantly reused

The wastes are made up of natural ingredients

Solution

Question 5

They are not environment friendly

Burning process is slow

They release lot of poisonous fumes

All of above

Solution

Question 6

They are non-reactive

They can melt

They have high number of free electrons

They do not have free electrons

Solution

Question 7

It is a good conductors of heat

It is a good conductor of electricity

It is a poor conductor of electricity

None of above

Solution

Question 8

Burning of material

Breakdown of material by natural processes

Recovering and reprocessing materials into useful products

Burying products

Solution

Question 9

Plastic milk bottles

Plastic food trays

CD/DVD cases

Plastic cups

Solution

Question 10

metals

plastic

Both A and B

None of the above

Solution

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