WorksheetsCombustion and flam
Total questions: 15
Worksheet time: 8mins
Rise in temperature of the atmosphere of the Earth is called
Ignition temperature
Global warming
Combustion
Acid rain
There are following zones of a flame
1
2
3
4
Combustion is a
Chemical process
Physical process
Both of these processes
None of these processes
Ignition temperature
Lowest temperature at catch fire
Higher temperature at catch fire
Any temperature
Moderately catch fire
Like fuel the sun also provides heat and light. The process taking place in the sun is called
Nuclear process
Combustion
Burning
None of the above
The below two cases in which a person is trying to burn the paper cup. In case 1, the cup has water in it and in case 2, it is empty and dry. Identify in which of the cases the paper will burn.
Case1
Case2
Both
None
Combustion of a substance releases heat and ___.
oxygen
wood
light
water
What is the main chemical component present in striking surface of a matchbox?
Graphite
Potassium
Phosphorus
Potassium chlorate
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 combustion reaction which occurs on its own, without any external supply of heat is called as:
Rapid combustion
Fire
Spontaneous combustion
Explosion
The SI unit of the calorific value of a fuel is :-
N/kg
KJ/kg
KW/kg
J/kg
The colour of outer zone of candle flame is _________.
Orange
Blue
Yellow
Red
The burning of LPG is an example of-- ----- combustion
Explosion
Spontaneous
Rapid
Slow
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called
Ignition temperature
Calorific value
Globle warming
Heat value
Substances which catch fire are called
Non combustable
Combustible
Acid
Base
