In which reaction, a large amount of gas is formed?
Combustion
Explosion
Burning
Oxidation
Certain substances burn rapidly and produces heat and light. Such combustion is known as
Slow combustion
Rapid combustion
Good combustion
Complete combustion
How heat and light are produced in Sun?
Nuclear reaction
Substitution reaction
Thermal cracking
The amount of heat energy produced on complete combustion of 1kg of a fuel is called its
Calorific value
Efficiency
Heat capacity
Specific heat capacity
Which of the following helps to putting out the fire in soda-acid fire extinguisher?
CO2
CO2+H2O
H2O
H2+H2O
The heat supplied to the paper cup is transferred to water by
Conduction
Convection
Insulation
In foam type fire extinguisher, which of the following products are formed?
2Al(OH)3 + 6H2O + 3NaSO4
2Al(OH)3 + 6CO + 3NaSO4
2Al(OH)3 + 6O2 + 3Na2SO4
2Al(OH)3 + 6CO2 + 3Na2S04
Which of the following is an ideal fuel?
Coal
LPG
Petrol
None of these
The substances which have very low ignition temperature and can easily catch fire with a flame are called
Conducting substances
Flammable substances
Inflammable substances
Non conducting substances
Which of the following poisonous gas is produced as a result of incomplete combustion?
Carbon monoxide
Carbon dioxide
Oxygen
Hydrogen
