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Q.

A bulb is connected first with dc and then ac of same voltage then it will shine brightly with  

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a

Brightness will be in ratio 1/1.4

b

AC

c

DC

d

Equally with both

answer is D.

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Detailed Solution

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Brightness Pconsumed1R  for Bulb,  Rac=Rdc, so brightness will be equal in both the cases.   

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