A burning candle when placed in an enclosed jar immediately gets extinguished. This is because
The supply of CO2 is cut off
The supply of O2 is cut off
The supply of N2 is cut off
Both b &c
Which of the following gases cause acid rain?
I. Ammonia
II. Hydrogen
III. Oxides of Nitrogen
IV. Sulphur dioxide
I and II only
II and IV only
III and IV only
All of these
In foam type extinguisher______ is present in bottle.
NaHCO3
Al2(SO4)3
Al(OH)3
Na25O4
Mark the corret statement.
Different substances catch fire at the same temperature.
Different substances catch fire at different temperatures
Same substances can catch fire at different temperatures.
None of these
Increased percentage of carbon dioxide in air has been linked to __________
Increased Rain
Global warming
Earthquake
Forest fire
Bio gas is a secondary fuel obtained from .
Coal
Animal dung
Petrol
Wood
Which zone is the hottest part in a candle flame?
Innermost zone
Middle zone
Outermost zone
Wax zone
_________ fuels gets exhausted over a period of time.
Non-renewable
Renewable
Primary
Secondary
Which of the following are requirements for producing fire?
Oxygen and heat
Fuel and oxygen
Fuel, oxygen and heat
Fuel and heat
Which one of these is/are essentials of a fire?
Heat
Fuel
Oxygen