Combustion and Flame [CBSE (Central Board of Secondary Education) Class-8 Science]: Questions 1 - 7 of 33

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Question 1

Question MCQ▾

Combustion is caused by the rapid union of oxygen with hydrogen or carbon in the oil or coal is called as:

Choices

Choice (4)Response

a.

Spontaneous combustion

b.

Rapid explosion

c.

Explosion

d.

None of the above

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Question 2

Question MCQ▾

A device used to stop fire is called:

Choices

Choice (4)Response

a.

Rapid combustion

b.

Sand bucket

c.

Ideal fuel

d.

Fire extinguisher

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Question 3

Question MCQ▾

Fire extinguishers used at airports and petrol pumps based on the principle of:

Choices

Choice (4)Response

a.

Smothering the fire

b.

Cooling the fire

c.

All of the above

d.

Question does not provide sufficient data or is vague

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Question 4

Question MCQ▾

The substances with low ignition temperature are called as:

Choices

Choice (4)Response

a.

Inflammable substance

b.

Fuel

c.

Flammable substance

d.

None of the above

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Question 5

Question MCQ▾

Harmful gases released during combustion are:

Choices

Choice (4)Response

a.

Water gas

b.

Carbon monoxide, carbon dioxide

c.

Producer gas

d.

Hydrogen, nitrogen,

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Question 6

Question MCQ▾

Substances used for producing heat energy are called as:

Choices

Choice (4)Response

a.

Flame

b.

Combustion

c.

Fire

d.

Fuel

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Question 7

Question MCQ▾

Combustion occurs rapidly is called as:

Choices

Choice (4)Response

a.

Explosion

b.

Rapid combustion

c.

Spontaneous combustion

d.

All of the above

Edit