Combustion and Flame-Fuel (CBSE Class-8 Science): Questions 8 - 14 of 17

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Question number: 8

» Combustion and Flame » Fuel » Introduction to Fuel

MCQ▾

Question

Fuels obtained after processing of natural fuels are called as:

Choices

Choice (4) Response

a.

Manufactured fuels

b.

Ideal fuels

c.

Processed fuels

d.

Both a. and c. are correct

Question number: 9

» Combustion and Flame » Fuel » Ideal Fuel

MCQ▾

Question

Examples of fuels used in industries are:

Choices

Choice (4) Response

a.

Water gas

b.

Producer gas

c.

Natural gas

d.

Both a. and b. are correct

Question number: 10

» Combustion and Flame » Fuel » Burning of Fuels Leads to Harmful Products

MCQ▾

Question

Global warming is produced due to the presence of gas, excess amount of

Choices

Choice (4) Response

a.

SO2 and NO2

b.

Carbon monoxide

c.

Carbon dioxide in air

d.

Question does not provide sufficient data or is vague

Question number: 11

» Combustion and Flame » Fuel » Introduction to Fuel

MCQ▾

Question

Calorific value of a fuel depends upon:

Choices

Choice (4) Response

a.

Amount of ash and water it contains

b.

Chemical composition

c.

Physical state of the fuel

d.

Both a. and b. are correct

Question number: 12

» Combustion and Flame » Fuel » Ideal Fuel

MCQ▾

Question

Amongst the three states of fuel which state of the fuel is considered best?

Choices

Choice (4) Response

a.

Solid

b.

Gaseous

c.

Liquid

d.

None of the above

Question number: 13

» Combustion and Flame » Fuel » Introduction to Fuel

MCQ▾

Question

Wastage of LPG can be reduced by:

Choices

Choice (4) Response

a.

Reduce the flame through control knob

b.

Use of pressure cooking devices

c.

Switch on burning device after placing the container on the burner

d.

All a. , b. and c. are correct

Question number: 14

» Combustion and Flame » Fuel » Fuel Efficiency

MCQ▾

Question

Fuel efficiency is:

Choices

Choice (4) Response

a.

The maximum energy which a given fuel can give leaving very little residue

b.

Lowest temperature at which a substance catches fire

c.

Amount of heat energy produced on complete combustion of 1 kg of a fuel

d.

Question does not provide sufficient data or is vague

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