Question

In the given circuit, the bulb is glowing. If the iron nail shown in the circuit is replaced by one of the substances given in the options, in which case the bulb will not glow?

• A. Wood
• B. Gold
• C. Silver
• D. Copper

Answer 1

The correct option is A Wood

Metals are good conductors of electricity and hence when the iron nail is replaced by another metal, the bulb will glow.
However, if the iron nail is replaced by a non-metal, which generally does conduct electricity, the bulb will stop glowing.
Hence, the bulb will not glow if it is replaced by wood.