CBSE Class-8 Science: Questions 120 - 127 of 469

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Question number: 120

» Synthetic Fibres and Plastics » Types of Synthetic Fibres » Polyester and Acrylic

MCQ▾

Question

Acrylic fibres are made from:

Choices

Choice (4) Response
a.

Crude oil

b.

Acrylic acid or its derivatives

c.

Cellulose

d.

Coal, water and air

Question number: 121

» Synthetic Fibres and Plastics » Plastics as Materials of Choice » Plastics Are Poor Conductors

MCQ▾

Question

Handles of frying pans and all electric wires used in household are made up of:

Choices

Choice (4) Response
a.

Rayon

b.

Plastics

c.

Nylon

d.

All

Question number: 122

» Synthetic Fibres and Plastics » Synthetic Fibres » Polymer

MCQ▾

Question

What are Polymers

Choices

Choice (4) Response
a.

Synthetic Fibres

b.

Giant molecules which are made of many repeating units

c.

Fibres

d.

Natural Fibres

Question number: 123

» Materials: Metals and Non-Metals » Physical Properties of Metals & Non-Metals » Malleability

MCQ▾

Question

Property of metals by which they can be beaten into thin sheets is called

Choices

Choice (4) Response
a.

Hard

b.

Malleability

c.

Ductility

d.

Lustrous

Question number: 124

» Combustion and Flame » Types of Combustion » Spontaneous Combustion

MCQ▾

Question

Combustion is caused by the rapid union of oxygen with hydrogen or carbon in the oil or coal is called as:

Choices

Choice (4) Response
a.

Explosion

b.

Rapid explosion

c.

Spontaneous combustion

d. None of the above

Question number: 125

» Coal and Petroleum » Natural Resources » Exhaustible Natural Resources

MCQ▾

Question

Exhaustible resources are also called as

Choices

Choice (4) Response
a.

Destructive

b.

Renewable resources

c.

Man-made material

d.

Non-renewable resources

Question number: 126

» Combustion and Flame » Fire » Fire Extinguisher

MCQ▾

Question

A device used to stop fire is called:

Choices

Choice (4) Response
a.

Rapid combustion

b.

Fire extinguisher

c.

Sand bucket

d.

Ideal fuel

Question number: 127

» Coal and Petroleum » Coal » Coke and Coal Tar

MCQ▾

Question

Black oily material resulting from the destructive distillation of coal is:

Choices

Choice (4) Response
a.

Coal-tar

b.

Crude oil

c.

Coal-gas

d.

Petroleum

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