Chemistry [NSTSE (National Science Talent Search Exam- Unified Council) Class 8]: Questions 138 - 142 of 209

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Question 138

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Question

MCQ▾

What is the side effect of air pollutant sulphur dioxide on human health?

Choices

Choice (4)Response

a.

Harms the skin and lungs

b.

Effects the heart and the liver

c.

Mixer with blood and prevents it from carrying oxygen

d.

Maker skin irritated

Question 139

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Question

MCQ▾

What is the effect of carbon particles and smoke from factories?

Choices

Choice (4)Response

a.

Decrease the rate of photosynthesis in plants

b.

They increase the rate of respiration in plants

c.

Decrease the rate of transpiration in plants

d.

Increase the absorption of carbon dioxide by plants

Question 140

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Question

MCQ▾

Which of the following pollutant involved and causes acid rains other than sulphur dioxide?

Choices

Choice (4)Response

a.

b.

c.

d.

Question 141

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Question

MCQ▾

Ozone layer is said to a protective layer because?

Choices

Choice (4)Response

a.

It reduces the amount of ultraviolet rays reaching the earth

b.

It is used by living organisms for respiration

c.

If reflects the heat from the earth back into the atmosphere

d.

It increases the temperature of the earth

Question 142

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Question

MCQ▾

When huge amount of sewage is dumped in a river, the BOD will?

Choices

Choice (4)Response

a.

Increase

b.

Decrease

c.

Remain Unchanged

d.

Increase or Decrease