NSTSE (National Science Talent Search Exam- Unified Council) Class 8: Questions 1950 - 1956 of 2028

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Question number: 1950

» Chemistry » Combustion and Flame

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Question

The temperature (lowest) at which substance starts burning is termed as?

Choices

Choice (4) Response

a.

Boiling point

b.

Minimum temperature

c.

Ignition temperature

d.

Critical temperature

Question number: 1951

» Chemistry » Pollution of Air and Water

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MCQ▾

Question

Which of the following processes occur in the troposphere?

Choices

Choice (4) Response

a.

Acidrain

b.

Greenhouse effect

c.

Photosynthesis

d.

Combustion

Question number: 1952

» Chemistry » Synthetic Fibers and Plastics

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MCQ▾

Question

PVC (polyvinyl chloride) is well known example & of

Choices

Choice (4) Response

a.

Thermosetting plastic

b.

Thermoplastic

c.

Acrylic

d.

Polyethene

Question number: 1953

» Chemistry » Pollution of Air and Water

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MCQ▾

Question

The emission of sulphur dioxide into the atmosphere causes?

Choices

Choice (4) Response

a.

Global warming

b.

Eutrophication

c.

Acid rain

d.

Respiratory problems

Question number: 1954

» Chemistry » Pollution of Air and Water

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MCQ▾

Question

Freon is not recommended to be used in refrigerators because they?

Choices

Choice (4) Response

a.

Affect human body

b.

Deplete ozone

c.

Increase temperature

d.

Affect environment

Question number: 1955

» Chemistry » Pollution of Air and Water

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MCQ▾

Question

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 number: 1956

» Chemistry » Pollution of Air and Water

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MCQ▾

Question

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

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