Choose the correct answer

combustion process in which a light is produced without the help of external heat
1. Rapid combustion
2. Spontaneous combustion
3. Explosion
4. Slow combustion
A form of combustion which takes place at low temperatures.
1. Rapid combustion
2. Spontaneous combustion
3. Explosion
4. Slow combustion
A combustion process in which a substance burns rapidly and produces heat and light with the help of external heat
1. Rapid combustion
2. Spontaneous combustion
3. Explosion
4. Slow combustion
There are unburnt vapours of the fuel and the colour is black and is least hot part.
1. The outer zone
2. The middle zone
3. The inner zone
4. Entire flame
A type of combustion in which a substance burns suddenly and produces heat, light and sound with the help of heat or pressure
1. Rapid combustion
2. Spontaneous combustion
3. Explosion
4. Slow combustion