Combustion and Flame

Which has highest ignition temperature than any other from the following?
1. Wood
2. Kerosene
3. Water
4. Plastic
Which one of the following gases is used in combustion?
1. Hydrogen
2. Nitrogen
3. Oxygen
4. Carbon dioxide
The burning of LPG is an example of
1. Rapid combustion
2. Sponatneous combustion
3. slow combustion
4. explosion
Which of the following is not a fossil fuel?
1. Coal
2. Petroleum
3. Natural gas
4. Water gas
Burning of coal in a closed room produces
1. carbon dioxide
2. carbon monoxide
3. nitrogen oxide
4. oxygen
Which is non-renewable source of energy?
1. Natural gas
2. Wind energy
3. Mechanical energy
4. Tidal energy
Substances that catches fire are
1. acids
2. bases
3. combustible
4. burners
Which zone represents partial combustion?
1. Middle zone
2. Lower zone
3. Inner zone
4. Outer zone
The temperature at which the subsatnces burns is called
1. melting
2. boiling temperature
3. kindling temperature
4. evaporation
When we blow off candle it extinguishes because
1. we exhale carbon dioxide
2. we exhale oxygen
3. we exhale with pressure
4. we spit water in every breathe