Chemistry [NSTSE (National Science Talent Search Exam- Unified Council) Class 8]: Questions 130 - 137 of 209

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Question number: 130

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Question

MCQ▾

How many number of electrons present in Valence shell of metals generally?

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 131

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Question

MCQ▾

What type of reaction is “combustion”?

Choices

Choice (4)Response

a.

Displacement reaction

b.

Reduction reaction

c.

Exothermic reaction

d.

Endothermic reaction

Question number: 132

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Question

MCQ▾

Which of the following gas is displaced when metal reacted with and ?

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 133

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Question

MCQ▾

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: 134

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Question

MCQ▾

Which of the following processes occur in the troposphere?

Choices

Choice (4)Response

a.

Acidrain

b.

Greenhouse effect

c.

Photosynthesis

d.

Combustion

Question number: 135

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Question

MCQ▾

PVC (polyvinyl chloride) is well known example & of

Choices

Choice (4)Response

a.

Thermosetting plastic

b.

Thermoplastic

c.

Acrylic

d.

Polyethene

Question number: 136

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Question

MCQ▾

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: 137

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Question

MCQ▾

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