NSO Level 1- Science Olympiad (SOF) Class 8: Questions 488 - 490 of 1076

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Question number: 488

» Metals and Non-Metals

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MCQ▾

Question

Sita bought a copper lamp as a decorative piece and displayed it in her show case. After a month she found that it looked dull with green patches on it. She was so shocked to see this. She can remove it and bring the lustre back by

1) Rubbing the patched area with a piece of lemon.

2) Rubbing the patched area with tamarind.

3) Rubbing the patched area with a detergent

4) Rubbing the patched area with a clean cloth.

Choices

Choice (4)Response

a.

3 and 4

b.

1 and 4

c.

2 and 3

d.

1 and 2

Question number: 489

» Synthetic Fibres and Plastics

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MCQ▾

Question

We are familiar with the four R’s used in environment protection. Identify the R used in the situations

Ravi donates his old clothes, winter wear, school bag, text books, shoes and toys to the orphanage in the city

Choices

Choice (4)Response

a.

Reduce

b.

Recover

c.

Reuse

d.

Recycle

Question number: 490

» Synthetic Fibres and Plastics

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MCQ▾

Question

Plastic is a synthetic material which catches fire easily but the fire proof uniforms of firemen are made of melamine which is a form of plastic. The explanation to this statement is

Choices

Choice (4)Response

a.

It is a poor conductor of electricity

b.

It do not catch fire when exposed to flame.

c.

Melamine is a thermosetting plastic.

d.

It do not get deformed when exposed to heat

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