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Q.

Observe the following circuits carefully. In which circuit will the bulb glow?


(i)                 coal.PNG


(ii)               eraser.PNG


(iii)            nail.PNG


(iv)             spoon.PNG


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a

Bulb will glow in (iii) and (iv)

b

Bulb will glow in (i) and (ii)

c

Bulb will glow in (iii) and (ii)

d

Bulb will glow in (iv) and (iii) 

answer is A.

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Detailed Solution

      spoon.PNG       Good conductors of electricity will let the electricity pass through them. Piece of coal and eraser are the poor conductors of electricity. Iron nail and steel spoon are the good conductors of electricity. When coal and eraser are connected in the circuit, electricity does not pass through them. Thus, the bulb will glow in (iii) and (iv).
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