In the figure all bulbs are identical. The bulb that lights most brilliantly is

1 only

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2 only

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2 and 4

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1 and 5

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Solution

The correct option is D 1 and 5
Intensity of bulb is proportional to current passing through that bulb.
Current in bulb $1$ and $5$ will be the most as current in bulb $3, 4$ and $2$ will get divided.
So that bulb that light most brilliantly is $1$ and $5$ .

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In the figure all bulbs are identical. The bulb that lights most brilliantly is

The correct option is D 1 and 5Intensity of bulb is proportional to current passing through that bulb.Current in bulb 1 and 5 will be the most as current in bulb 3,4 and 2 will get divided.So that bulb that light most brilliantly is 1 and 5.

The correct option is D 1 and 5
Intensity of bulb is proportional to current passing through that bulb.
Current in bulb $1$ and $5$ will be the most as current in bulb $3, 4$ and $2$ will get divided.
So that bulb that light most brilliantly is $1$ and $5$ .