Chemistry-Combustion and Flame [NSTSE (National Science Talent Search Exam- Unified Council) Class 8]: Questions 1 - 6 of 27

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Question number: 1

» Chemistry » Combustion and Flame

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Question

From which of the following, synthetic petroleum is artificially produced.

Choices

Choice (4)Response

a.

Coal

b.

Wood

c.

L. P. G

d.

Petroleum

Question number: 2

» Chemistry » Combustion and Flame

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MCQ▾

Question

When 1 gram of fuel is completely burned, the heat produced is termed as?

Choices

Choice (4)Response

a.

Heat capacity

b.

Vapour density

c.

Boiling point

d.

Calorific value

Question number: 3

» Chemistry » Combustion and Flame

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MCQ▾

Question

Which type of reaction is combustion?

Choices

Choice (4)Response

a.

Redox reaction

b.

Substitution

c.

Oxidation

d.

Reduction

Question number: 4

» Chemistry » Combustion and Flame

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Question

When you take a burning wood and you poured water over that burning wood, the fire of wood goes off, because?

Choices

Choice (4)Response

a.

The flame vapourises

b.

Decrease in temperature of wood

c.

Water molecules reacts with oxygen present in that flame.

d.

Temperature of water goes-up

Question number: 5

» Chemistry » Combustion and Flame

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MCQ▾

Question

Inspite of having dangerous problems with hydrogen, it is used as fuel for some applications. What are they?

Choices

Choice (4)Response

a.

Car fuel

b.

Oxyhydrogen flame

c.

Rocket fuel

d.

All a. , b. and c. are correct

Question number: 6

» Chemistry » Combustion and Flame

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MCQ▾

Question

When fire is caused by burning petrol and oil, then what type of fire extinguishers must be used?

Choices

Choice (4)Response

a.

type

b.

Water type

c.

Soda-acid type

d.

Foam type

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