Science-Class-8 NCERT (NCERT Based General Studies (GS)): Questions 148 - 153 of 468

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Question number: 148

» Science » Class-8 NCERT » Coal and Petroleum (Coal)

MCQ▾

Question

Coal is formed by the process of:

Choices

Choice (4) Response
a.

Destructive distillation

b.

Decomposition

c.

Carbonisation

d.

Fractional distillation

Question number: 149

» Science » Class-8 NCERT » Combustion and Flame (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: 150

» Science » Class-8 NCERT » Combustion and Flame (Flame)

MCQ▾

Question

Hottest part of flame is:

Choices

Choice (4) Response
a.

Outermost zone

b.

Zone A

c.

Zone B

d. Both a. and b. are correct

Question number: 151

» Science » Class-8 NCERT » Coal and Petroleum (Petroleum)

MCQ▾

Question

The constituents of petroleum separated in the fractional distillation tower are:

Choices

Choice (4) Response
a.

Natural gas, petroleum gas

b.

Lubricating oil, paraffin wax, bitumen

c.

Petrol, kerosene oil

d. All a. , b. and c. are correct

Question number: 152

» Science » Class-8 NCERT » Combustion and Flame (Fire)

MCQ▾

Question

Soda acid fire extinguisher based on the principle of:

Choices

Choice (4) Response
a.

Smothering the fire

b.

Cooling the fires

c. None of the above
d. Question does not provide sufficient data or is vague

Question number: 153

» Science » Class-8 NCERT » Combustion and Flame (Flame)

MCQ▾

Question

Which types of substances form flame?

Choices

Choice (4) Response
a.

Combustible substance which produces energy when burnt

b.

Combustible gas burns rapidly and produces heat and light

c.

Combustible substances which vaporise during burning form a flame

d.

Combustible substances which have very low ignition temperature and can easily catch fire.

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