Why is LPG labelled as inflammable substance?

Important Questions on Combustion, Flame and Fuels

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.

MEDIUM

8th CBSE

IMPORTANT

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

A candle produces a yellow flame on burning while LPG burning in a gas burner produces a blue flame. Explain.

MEDIUM

8th CBSE

IMPORTANT

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

Why are water and sand used to extinguish fires?