Question

In which of the following circuit diagrams given below, does the electric bulb show a glow ?

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The correct option is D

Explanation of correct options:

Option D

1. Silver is a good conductor of electricity so the circuit is completed.
2. Hence the current will flow and the bulb will glow.

Explanation of incorrect options:

Option A

1. Here the circuit is connected with silk thread.
2. Silk thread is a poor conductor of electricity.
3. Therefore, the bulb will not glow.

Option B

1. Here also the circuit is connected with silk thread which is a poor conductor of electricity.
2. So the circuit will not glow.

Option C

The circuit is not closed, it is kept open, so the bulb will not bulb.

Hence, option D is correct.