Consider the given circuit in which three bulbs A, B and C are connected in series. Which bulbs will glow when the tip of the safety-pin (acting as the switch) touches the end Y?

A and B

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B and C

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A and C

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A, B and C

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Solution

The correct option is D A, B and C
When the tip of the safety-pin, being a good conductor of electricity (metal) touches the end Y, the switch is closed. The circuit is completed and the current starts flowing through the circuit. The current through each of the bulbs is the same as the bulbs are connected in series. So, all the bulbs will glow at the same time.

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