Classify the fuels on the basis of their use.

Important Questions on Combustion, Flame and Fuels

MEDIUM

8th CBSE

IMPORTANT

Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q D

Why are lead compounds harmful to us?

MEDIUM

8th CBSE

IMPORTANT

Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q D

Why is soda-acid fire extinguisher not effective when oil catches fire?

EASY

8th CBSE

IMPORTANT

Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q D

Which of the following compounds has least calorific value. (biogas, wood, kerosene, LPG).

EASY

8th CBSE

IMPORTANT

Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q D

Why is LPG labelled as inflammable substance?

EASY

8th CBSE

IMPORTANT

Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q D

What is calorific value? Write its unit.

MEDIUM

8th CBSE

IMPORTANT

Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q D

In an experiment 5 kg of a fuel was completely burnt. The heat produced was measured to be 1,80,000 KJ. Calculate the calorific value of the fuel.

MEDIUM

8th CBSE

IMPORTANT

Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q D

Suppose you are asked to cook rice using cow dung cake, coal and LPG as fuels. Which fuel would you prefer? Give your reason.

MEDIUM

8th CBSE

IMPORTANT

Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q E

Differentiate between combustible and non-combustible substances.