Combustion and Flame (CBSE (Central Board of Secondary Education- Board Exam) Class-8 Science): Questions 9 - 15 of 33

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Question number: 9

» Combustion and Flame » Fuel » Introduction to Fuel

MCQ▾

Question

Synthetic petroleum is prepared from:

Choices

Choice (4) Response

a.

Powered animal dung

b.

Coal gas

c.

Powered coal

d.

Powered coke

Question number: 10

» Combustion and Flame » Fuel » Ideal Fuel

MCQ▾

Question

Characteristics of ideal fuel are:

Choices

Choice (4) Response

a.

Proper ignition temperature

AND

Should not produce toxic products

b.

Easy to handle, cheap and easily available

AND

Should not leave much residue after combustion

c.

High Calorific value

d.

All a. , b. and c. are correct

Question number: 11

» Combustion and Flame » Fuel » Introduction to Fuel

MCQ▾

Question

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 coal is mixed with hot solvent

c.

Powered coke is mixed with hot solvent

d.

When coke is heated with hydrogen

Question number: 12

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

MCQ▾

Question

Full form of CNG is:

Choices

Choice (4) Response

a.

Combined natural gas

b.

Combustion natural gas

c.

Compressed natural gas

d.

Compact Natural Gas

Question number: 13

» 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: 14

» 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: 15

» 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

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