Question

In the circuit shown in the figure, when the switch is moved to ‘ON’ position,

• A. bulb A will glow first
• B. the bulb B will glow first
• C. bulb C will glow first
• D. all bulbs will glow together

Answer 1

The correct option is D

all bulbs will glow together

Explanation for Correct Option:

Option (D):

1. In order for the bulbs to glow, the current must form a closed loop.
2. The current must travel from the positive to negative terminal passing through all the bulbs along the way.
3. Hence, all bulbs will glow together as soon as the current completes the circuit.

Explanation for Incorrect Option:

Option (A):

1. When current enters only the bulb A, the circuit is not complete.
2. Hence, bulb A will not glow first.

Option (B):

1. When current enters only the bulb B, the circuit is not complete.
2. Hence, bulb B will not glow first.

Option (C):

1. When current enters only the bulb C, the circuit is not complete.
2. Hence, bulb C will not glow first.

Hence, option (D) is the correct answer.