| ASSERTION: Bulbs always fuse when they are switched off. |
| REASON: When the bulb is switched off at that instant the resistance of the bulb increases. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: D
Solution :
Actually the bulbs fuse when they are switched on. As the bulb is switched on it lights up. Its temperature increases. This happens very quickly. After many cycles, the filament of the bulb become thin and the bulb is at the verge of burning out. When such a bulb is switched on its initial resistance being low, there will be a sudden, rush of current as a result of which the filament burns out.
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