NSO Level 1- Science Olympiad (SOF) Class 8: Questions 447 - 450 of 1076

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Question number: 447

» Metals and Non-Metals

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MCQ▾

Question

Mother gave Meena two small pouches containing iron fillings and coal and asked her to crush both to a fine powder. The result would be

Choices

Choice (4) Response

a.

She could make a fine powder of both.

b.

She could make a fine powder of coal but could not powder iron fillings.

c.

She could not make a fine powder of either coal or iron fillings.

d.

She could make a fine powder of iron fillings but could not powder coal

Question number: 448

» Synthetic Fibres and Plastics

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MCQ▾

Question

Identify the polymers from its use

It is used to make parachute, ropes for trekking, bristles of tooth brush, seat belts, sleeping bags etc

Choices

Choice (4) Response

a.

PVC

b.

Teflon

c.

Nylon

d.

Polythene

Question number: 449

» Metals and Non-Metals

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MCQ▾

Question

Sodium and potassium are kept in kerosene. The reason behind this statement is

Choices

Choice (4) Response

a.

They react vigorously with oxygen and water

b.

They generate a lot of heat energy when exposed to air or water

c.

Sodium and Potassium are highly reactive metals

d.

All a. , b. and c. are correct

Question number: 450

» Synthetic Fibres and Plastics

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MCQ▾

Question

Classify the following into biodegradable and non biodegradable substances

  1. Paper, 2. Polythene bag, 3. Metals, 4. Wood, 5. Rock, 6. cotton

Choices

Choice (4) Response

a.

1,5, 6 – biodegradable and 2,3, 4 – non biodegradable

b.

1,4, 6 – biodegradable and 2,3, 5 – non biodegradable

c.

1,3, 6 – biodegradable and 2,4, 5 – non biodegradable

d.

1,2, 3 – biodegradable and 4,5, 6 – non biodegradable

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