MEDIUM
8th CBSE
IMPORTANT
Earn 100

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

Important Questions on Combustion, Flame and Fuels

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?
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q E
How does carbon dioxide help in extinguishing a fire?
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q E

Study the details of the following fuels and select the best fuel out of them. Give reason.

Fuel Calorific Value Ignition Temperature
X 45,000 KJ/kg 350°C
Y 35,000 KJ/kg 750°C
Z 75,000 KJ/kg 750°C
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q E
What is the cause behind the colour change of the Taj Mahal from white to yellowish?
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q E
Classify the fuels on the basis of their source.
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q E
LPG is better domestic fuel than wood give reasons.
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q E
Give reasons why Goldsmiths use the outermost zone of the flame for melting gold and silver?
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 6 - Combustion, Flame and Fuels>ASSESSMENT ZONE>Q E
Give reasons why for any fuel to burn, it is essential to reach its ignition temperature?