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Q.

An electric filament bulb can be worked from


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a

DC supply only

b

AC supply only

c

Battery supply only

d

All of the above 

answer is D.

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Detailed Solution

Concept: The main function of an electric filament bulb is to glow when an electric current is passed through it.
The only requirement for glowing of the electric filament in the electric bulb is the electric current. The electric current required to glow the bulb can be supplied from a DC supply, AC supply or battery supply .Therefore, the electric current can be worked from DC supply, AC supply and battery supply.
Hence, the correct option is 4 .
 
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