CBSE Class-8 Science: Questions 162 - 167 of 469

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Question number: 162

» Coal and Petroleum » Petroleum » Constituents of Petroleum & Their Uses

MCQ▾

Question

Bitumen is defined as

Choices

Choice (4) Response

a.

Soft kind of pitch resembling asphalt

b.

Clean light fuel produced when coal is strongly heated in an air tight oven

c.

By product during processing of coal

d.

Black oily material resulting from the destructive distillation of coal

Question number: 163

» Coal and Petroleum » Petroleum » Refining of Petroleum

MCQ▾

Question

Method used for petroleum refining is:

Choices

Choice (4) Response

a.

Destruction distillation

b.

Fractional distillation

c.

Distillation

d.

None of the above

Question number: 164

» 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: 165

» 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: 166

» 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

Question number: 167

» Coal and Petroleum » Petroleum » Constituents of Petroleum & Their Uses

MCQ▾

Question

Greenish brown flammable liquid found underground trapped between rocks is

Choices

Choice (4) Response

a.

Coal-tar

b.

Coke

c.

Petroleum

d.

Natural gas

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