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24 questions
Which substance give heat and light after combustion
Flame
Fuel
Combustion
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
Fire extinguisher-
Raise up temperature of fuel
Bring down the temperature of fuel
Cut off the supply of air
None of these
Good fuel is
Readily available
Cheap
Burn easily in air
All of these
Ideal fuel has ____________ calorific value
Zero
Low
Moderate
High
Combustion is a reaction in which a substance reacts with
hydrogen
Nitrogen
Oxygen
Chlorine
What is the main chemical component present in striking surface of a matchbox?
Potassium chlorate
Phosphorus
Potassium
Graphite
An ideal fuel is cheap, readily available, easily combustible and easy to transport. It has high calorific value. It does not produce gases or residues that pollute the environment. Based on the above statements which of the following is closest to being an ideal fuel?
Compressed Natural Gas (CNG)
Kerosene
Petrol
Coal
When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. Identify the type of combustion?
Explosion
Random combustion
Rapid combustion
Spontaneous combustion
The least hot zone of a candle flame is
non-lumious zone
luminous
dark zone
blue zone at the base of the wick
Fire is extinguished by
removing all combustible substance
cutting off supply of air
cooling the burning substance
all the these
matchstick catch fire?
By rubbing a matchstick against a rough surface
By attaining the ignition temperature
None of the above
all of the above
Burning of LPG is an example of
Spontaneous
Rapid
Explosion
None
ignition temperature is
any temperature at which a substance catches fire
highest temperature at which a substances catches fire
lowest temperature at which a substance catches fire
Calorific value is measured in
Kilo joules
Kilo grams
Kilo joules per kg
Kilo metre
Unburnt carbon particles causes
Stomach infection
Respiratory problems
Brain infections
Throat problems
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