MEDIUM
8th CBSE
IMPORTANT
Earn 100

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

Important Questions on Combustion, Flame and Fuels

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.
HARD
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q E
Identify and discuss the three main zones of the candle flame.
HARD
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q E
Mention five characteristics of an ideal fuel.