Chemistry [NSTSE (National Science Talent Search Exam- Unified Council) Class 8]: Questions 197 - 202 of 209

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Question 197

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Question

MCQ▾

Sewage water can be purified by the recycling action of?

Choices

Choice (4)Response

a.

Non-biodegradable chemicals

b.

Fish

c.

Micro organising

d.

Fuels

Question 198

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Question

MCQ▾

What is meant by conserving the environment?

Choices

Choice (4)Response

a.

Changing natural resources from its original state

b.

Preserving the condition of the nature than has been destroyed

c.

Not lowering the quality of the environment

d.

Not destroying natural resources

Question 199

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Question

MCQ▾

Which of the following is major source of the pollutant chlorofluorocarbons?

Choices

Choice (4)Response

a.

Industrial effluents

b.

Aerosols

c.

Sewage pollutants

d.

None of the above

Question 200

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Question

MCQ▾

Which are the primary constituents of photo chemical smog?

Choices

Choice (4)Response

a.

Hydrocarbons & CFCs.

b.

And

c.

and hydrocarbons

d.

Question 201

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Question

MCQ▾

The process in which threads from cocoon are taking out in called or known as?

Choices

Choice (4)Response

a.

Reeling

b.

Rearing

c.

Sorting

d.

Scouring

Question 202

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Question

MCQ▾

Electrical disturbances in the atmosphere (troposphere) initiates reactions between nitrogen and?

Choices

Choice (4)Response

a.

Water vapour

b.

Oxygen & water

c.

Sulphur

d.

All of the above