CBSE Class-8 Science: Questions 111 - 119 of 469

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Question number: 111

» Materials: Metals and Non-Metals » Metals & Non- Metals » Uses of Metals and Nonmetals

MCQ▾

Question

Metal present in chlorophyll is:

Choices

Choice (4) Response

a.

Oxygen

b.

Magnesium

c.

Hydrogen

d.

Iron

Question number: 112

» Materials: Metals and Non-Metals » Chemical Properties of Metals & Non-Metals » Reactions With Acids

MCQ▾

Question

Sulphur reacts with:

Choices

Choice (4) Response

a.

Dilute hydrochloric acid

b.

Hot Concentrated Nitric acid

c.

Concentrated sulphuric acid

d.

Concentrated hydrochloric acid

Question number: 113

» Materials: Metals and Non-Metals » Metals & Non- Metals » Uses of Metals and Nonmetals

MCQ▾

Question

Electric wires and cables are made up of:

Choices

Choice (4) Response

a.

Zinc

b.

Copper

c.

Aluminium

d.

Magnesium

Question number: 114

» Materials: Metals and Non-Metals » Metals & Non- Metals » Uses of Metals and Nonmetals

MCQ▾

Question

Oxygen is used

Choices

Choice (4) Response

a.

As fuel

b.

In Crackers

c.

In making antiseptic

d.

For breathing purpose

Question number: 115

» Synthetic Fibres and Plastics » Plastics » Thermoplastics

MCQ▾

Question

The plastic which can be moulded is

Choices

Choice (4) Response

a.

Thermosetting

b.

Polythene

c.

None

d.

Thermoplastic

Question number: 116

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

MCQ▾

Question

Polyester is inert to sea water thus it is used for making of:

Choices

Choice (4) Response

a.

Sail boats, water hoses for fighting and as a packing material for food

b.

For making base of magnetic recording tape.

c.

For making bottles and containers

d.

For making swim wears

Question number: 117

» Synthetic Fibres and Plastics » Types of Synthetic Fibres » Nylon

MCQ▾

Question

One fully synthetic fibre is:

Choices

Choice (4) Response

a.

Nylon

b.

Rayon

c.

Polyesters

d.

Acrylic fibres

Question number: 118

» Synthetic Fibres and Plastics » Plastics » Thermosetting Plastics

MCQ▾

Question

Bakelite is an example of:

Choices

Choice (4) Response

a.

a and b

b.

Thermosetting plastics

c.

Thermoplastic plastics

d.

Polythene

Question number: 119

» Synthetic Fibres and Plastics » Plastics » Thermoplastics

MCQ▾

Question

What are the characteristics of thermoplastic?

Choices

Choice (4) Response

a.

They soften on warming.

b.

They stretch easily.

c.

They are flexible.

d.

All a. , b. and c. are correct

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