Question

5.When a drop of water falls on a glowing electric bulb, it bursts. Why? (1m)

Answer 1

Dear student,
When a drop of water falls on a hot glass bulb there is a sudden drop of temperature on the spot where the water drop hits. This decrease in temperature makes the glass to contract. The stress developed on the site of contraction is responsible for the cracking of the glass bulb.
Regards