Question

An electric bulb is connected to a cell through a switch as shown in figure. When the switch is turned ON, the bulb does not glow. Identify the incorrect reason for this.

• A.
  The bulb may be fused.
• B.
  The cell may be a used one.
• C. Connecting wires may be made up of silver.
• D.
  Loose connections between terminals of cell.

Answer 1

The correct option is C Connecting wires may be made up of silver.

When the switch is brought to the ‘ON’ position, the bulb does not glow. There could be the following reasons for it:
(i) Loose connections between terminals of cell, bulb or switch.
(ii) Connecting wires may be broken.
(iii) The cell may be a used one.
(iv) The bulb may be fused.

Wires used in an electric circuit are made up of conductors. Silver is a good conductor of electricity. If the conducting wire is made up of silver, it will allow the electricity to flow in the circuit and help the bulb to glow. So it cannot be the reason for bulb to not glow.