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Q.

A 25 watt, 220 volt bulb and a 100 watt, 220 volt bulb are connected in series across 440 volt line

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a

only 100 watt bulb will fuse

b

only 25 watt bulb will fuse

c

none of the bulb will fuse

d

both bulbs will fuse

answer is B.

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Detailed Solution

R=V2P;V=iR  their resistances are in the ration 4:1 and in series the potential is directly proportional to resistance so potential of 25 W will be more than 220 V so it will fuse.
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