Question

Which of the following has been placed in the wrong column?

Spontaneous combustion

Rapid combustion

(a) forest fires
(b) petrol in a fuel tank catching fire
(c) bomb explosions
(d) firecrackers

Answer 1

(b) petrol in a fuel tank catching fire

It is an example of rapid combustion and not of spontaneous combustion. This is because petrol catches fire only when heat is supplied externally. It cannot catch fire on its own.