MEDIUM
8th CBSE
IMPORTANT
Earn 100

Why does a paper cup containing water not burn when placed over a flame?

Important Questions on Combustion and Fuels

EASY
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q A
Define calorific value of a fuel.
MEDIUM
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q A
Arrange petrol, diesel and kerosene in order of increasing boiling range.
EASY
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q A
Name three gaseous fuels and their sources.
MEDIUM
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q A
Why should the ignition temperature of a fuel not be below room temperature?
MEDIUM
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q B
Mention three disadvantages of using coal as a fuel.
MEDIUM
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q B
What is biogas and how does it burn?
HARD
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q B
Draw a diagram to show the fractional distillation of petroleum.
HARD
8th CBSE
IMPORTANT
Basic Science for Class 8>Chapter 7 - Combustion and Fuels>Exercises>Q C
Describe an activity to show that a candle burns to give water vapour, carbon dioxide and soot.