WorksheetsCombustion And Flame
Total questions: 15
Worksheet time: 3mins
Burning of charcoal in a closed room will produce
Carbon dioxide
Nitrogen dioxide
Carbon monoxide
Sulphur dioxide
The substances which have very low ignition temperature will
Catch fire easily
Will not catch fire
Catch fire after some time
None of these
Ignition temperature is
Lowest temperature at which a substance catches fire
Highest temperature at which a substance catches fire
Any temperature
1000 C
Combustion is a
Natural process
Chemical process
Physical process
None of these processes
Which one of the following is combustible?
Iron nail
Glass
Stone pieces
Paper
Which is the hottest part in the candle flame?
Yellow
Wax part
Black
Blue
Fuel may be
Solid
Liquid
Gas
All of the three
Combustion is a reaction in which a substance reacts with
hydrogen
Nitrogen
Oxygen
Chlorine
Water cannot be used as a fire extinguisher to put out
Burning coal
Electrical fires
Burning wood
Forest fires
Ideal fuel has ____________ calorific value
Zero
Low
Moderate
High
What is the unit for expressing the calorific value of a fuel?
m/sec
KJ/Kg
Kg/Kj
Kg
The substance which ________ during burning give flames,
Heats
Vaporise
Boils
Melts
Burning of LPG is an example of
Spontaneous
Rapid
Explosion
None
Substance which catch fire are called
Acids
Bases
Burners
Combustible
Which of the following fuels has the highest calorific value?
Wood
Coal
Hydrogen
Petrol
