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Worksheetscombustion and flame
Total questions: 20
Worksheet time: 7mins
Which substance give heat and light after combustion
Flame
Fuel
Combustion
None of these
Coal burns with ____________________________
Flame
Only glow
Both flame and glow
None of these
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 catch fire
Higher temperature at catch 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
In the presence of water, ignition Temperature of paper is-
Decrease
Increase
Remain constant
None of these
Which of the following is inflammable Substances?
Petrol
Wood
Paper
Straw
Fire extinguisher-
Raise up temperature of fuel
Bring down the temperature of fuel
Cut off the supply of air
None of these
Which is the hottest part in the flame of the candle
Yellow
Wax part
Black
Blue
Good fuel is
Readily available
Cheap
Burn easily in air
All of these
Ideal fuel has ____________ calorific value
Zero
Low
Moderate
High
CNG and LPG are the examples of
solid fuels
liquid fuels
gaseous fuels
they aren't fuels
What do not produce flames but generate heat
Oil
Coal
Petroleum
Wood
Combustion always results as flames
True
False
What are the three essential requirements for combustion
Fuel
Supply of oxygen
Water
Heat
Which of the following fuels has the highest calorific value?
Wood
Coal
Hydrogen
Petrol
The least hot zone of a candle flame is
non-lumious zone
luminous
dark zone
blue zone at the base of the wick
