Chemistry [NSTSE (National Science Talent Search Exam- Unified Council) Class 8]: Questions 203 - 208 of 209

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Question number: 203

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Question

MCQ▾

What are the exhausting gases from automobile vehicles?

(I) Carbon dioxide

(II) Sulphur dioxide

(III) Oxides of nitrogen

Choices

Choice (4)Response

a.

I and II only

b.

I & III only

c.

II, and III only

d.

I, II, III

Question number: 204

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Question

MCQ▾

In the process of obtaining silk, the rearing of silk warms is called?

Choices

Choice (4)Response

a.

Sericulture

b.

Pisciculture

c.

Arboriculture

d.

All of the above

Question number: 205

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Question

MCQ▾

The leaching of chemical fertilizers into rivers and ponds cause

Choices

Choice (4)Response

a.

Increase the oxygen levels of water

b.

Increase in number of aquatic organisms

c.

Air pollution

d.

The rapid growth of algal

Question number: 206

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Question

MCQ▾

If BOD of river is high, it means that the river is?

Choices

Choice (4)Response

a.

Very-much polluted with inorganic chemicals

b.

Very-much polluted with inorganic chemicals which are decomposed by micro-organism

c.

Polluted with Pesticides

d.

Not polluted

Question number: 207

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Question

MCQ▾

Which of the following is used to make non-stick cookwares?

Choices

Choice (4)Response

a.

Polytetrafluoroethylene

b.

Polyvinyl Cookwares?

c.

Polystyrene

d.

Polyethylene Terephthalate

Question number: 208

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Question

MCQ▾

The water pollutant that is incorrectly paired with the source?

Choices

Choice (4)Response

a.

Oil spill – ship

b.

Sewage – large factory

c.

Nitrate - Farm

d.

Pesticide – oil palm plantation