CBSE Class-8 Science: Questions 147 - 153 of 469

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Question number: 147

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

MCQ▾

Question

Which gas combines with haemoglobin of blood?

Choices

Choice (4) Response

a.

NO2

b.

CO

c.

SO2

d.

CO2

Question number: 148

» Coal and Petroleum » Coal » Formation of 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

» 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: 150

» Combustion and Flame » Flame » Structure of a 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

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

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Lubricating oil, paraffin wax, bitumen

AND

Petrol, kerosene oil

b.

Natural gas, petroleum gas

c.

Diesel oil, fuel oil

d.

All a. , b. and c. are correct

Question number: 152

» Combustion and Flame » Fire » Fire Extinguisher

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

» Combustion and Flame » Flame » What Is 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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