The bulb in the given electrical circuit does not glow even after the switch is turned ON. Which of the following could be a possible reason for this?

Bulb is fused.

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Solution is non-electrolytic.

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Connections are faulty.

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Battery is weak.

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Solution

The correct option is D Battery is weak.
The bulb circuit dipped in liquid or solution may not glow when the switch is turned on because:

Bulb itself could be fused or damaged.

Some connections may be loose or faulty.

Electrolyte may not free charges.

Battery is weak, so the current is not strong enough to light the bulb.

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