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WorksheetsCOMBUSTION AND FLAME
Total questions: 26
Worksheet time: 6mins
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
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
like fuel the sun also provides heat and light. the process taking place in the sun is called
Combustion
Nuclear Reaction
Burning
None of these
The substance which have very low ignition temperature will
Catch fire easily
Will not catch fire
Catch fire after some time
None of these
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
Which of the following is inflammable Substances?
Petrol
Wood
Paper
Straw
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
The least hot zone of a candle flame is
non-lumious zone
luminous
dark zone
blue zone at the base of the wick
What substance turns into gas and burns?
wax vapor
wick
solid wax
hydrogen in the air
Moderately hot zone in a candle flame
outer zone
middle zone
innermost zone
wax candle
which occurs rapidly and produce heat and light?
When water is poured over burning wood, the fire goes off. This is because
temperature of wood decreases
temperature of water goes up
molecules of water reacts with oxygen present in the flame
the flame vapourises
Fire is extinguished by
removing all combustible substance
cutting off supply of air
cooling the burning substance
all the these
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
Which one of the following is combustible?
Iron nail
Glass
Stone pieces
Paper
When carbon dioxide dissolves in water it formsccarbonic acidhydrochloric acidcitric acidcarbonic hydroxide
carbonic acid
hydrochloric acid
citric acid
carbonic hydroxide
