Burning of a matchstick is an example of a __________.
Slow Combustion
Rapid Combustion
Spontaneous Combustion
None of these
Inflammable substances normally have a ______ ignition temperature.
Low
High
Constant
Medium
The conditions necessary for combustion are:
presence of combustible substance
presence of supporter of combustion
attainment of ignition temperature
all of these
Why doesn't matchstick burn by itself, eventhough it is a combustible substance?
It gets ignited due to the heat of friction
A combustible substance cannot catch fire below is ignition temperature.
Both a & b
Select the incorrect statement.
Insufficient supply of oxygen results in complete combustion.
In sufficient supply of oxygen results in incomplete combustion.
Sufficient supply of oxygen results in complete combustion.
Both b & c
Burning of coal and diesel releases _____________ gas
Hydrogen
Sulfur dioxide
Carbon
Hydrogen peroxide
When combustion occurs, unburnt carbon particles are produced. These particles are harmful, as they cause
Respiratory problems
Digestion problems
Heat problems
Skin problems
Increased percentage of carbon dioxide in air has been linked to __________
Increased Rain
Global warming
Earthquake
Forest fire
Combustion is nothing but _________ of fuels.
Burning
Heating
Lighting
Reaction
Oxides of sulfur and nitrogen dissolve in rain water and form acids such rain is called__________
Acid rain
Chemical rain
Fuels
