NCERT Class VIII Science Solution: Chapter 3-Synthetics Fibres and Plastics Part 2

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Question 4:

Give examples which indicate that nylon fibres are very strong.

Answer:

Nylon is a very strong fibre that is why nylon is used for making parachutes, rock climbing ropes, fishing nets seat belts etc. A nylon thread is elastic and light but actually stronger than a steel wire.

As showing images is a result for parachute

Result for Parachute

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Question 5:

Explain why plastic containers are favored for storing food.

Answer:

Plastic containers are favored for storing food for the following reasons:

  • Plastic containers are light weight so they are easy to handle.

  • The price of plastic containers is very less as compared to other containers.

  • They have good strength.

  • Plastic containers are durable.

As showing images is a result for favored for storing food.

Result for Favored for Storing Food

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Question 6:

Explain the difference between the thermoplastic and thermosetting plastics.

Answer:

Difference between the thermoplastic and thermosetting plastics:

Difference between the thermoplastic and thermosetting plastics

S. No

Thermoplastic

Thermosetting plastics

1.

Plastic which gets deformed easily on heating and can be bent easily are known as thermoplastics.

Plastics which when molded once, cannot be softened by heating. These are called thermosetting plastics.

2.

Polythene and PVC are some of the examples of thermoplastics.

Two examples are Bakelite and Melamine.

3.

These are used for manufacturing toys, combs and various types of containers.

Bakelite is used for making electrical switches, handles of various utensils, etc. Melamine is used for making floor tiles, kitchenware and fabrics which resist fire.

As showing images is a thermoplastic and thermosetting plast …

Thermoplastic and Thermosetting Plastics

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