Combustion and Flame-Fuel [CBSE (Central Board of Secondary Education) Class-8 Science]: Questions 1 - 6 of 17

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Question 1

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 2

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 3

Question MCQ▾

Synthetic petroleum is prepared from:

Choices

Choice (4)Response

a.

Powered coal

b.

Powered animal dung

c.

Coal gas

d.

Powered coke

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Question 4

Question MCQ▾

Characteristics of ideal fuel are:

Choices

Choice (4)Response

a.

Should not leave much residue after combustion

b.

Proper ignition temperature

c.

Should not produce toxic products

AND

High Calorific value

AND

Easy to handle, cheap and easily available

d.

All c., b. and a. are correct

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Question 5

Question MCQ▾

Synthetic gas is formed:

Choices

Choice (4)Response

a.

When powdered coal is heated with hydrogen under pressure in the presence of catalyst

b.

Powered coke is mixed with hot solvent

c.

Powered coal is mixed with hot solvent

d.

When coke is heated with hydrogen

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Question 6

Question MCQ▾

Full form of CNG is:

Choices

Choice (4)Response

a.

Combustion natural gas

b.

Compact Natural Gas

c.

Compressed natural gas

d.

Combined natural gas

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