Why does a bulb burst, which has been glowing for a long time after a drop of cold water has fallen on it?

It is because glass conducts electricity.

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It is because uneven cooling of the glass takes place.

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It is because water freezes the bulb.

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It is because glass conducts more heat.

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Solution

The correct option is B It is because uneven cooling of the glass takes place.
When the drop of water falls on a glowing electric bulb, the temperature of that part of that glass falls down immediately and that part of the glass shrinks. This sudden and uneven cooling effect on glass causes it to develop a crack and the bulb bursts out.

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