Wires `P` and `Q` have the same resistance at ordinary (room) temperature. When heated, resistance of `P` increases and that of `Q` decreases. We conclude that

When temperature of metal increases, does the resistance increases or decreases?

The resistance of a metal increases with a decrease in temperature.

Assertion (A) When a wire of aluminium and another wire of silicon are heated from room temperature to 80^(@)C , the conductivity of aluminium increases and that of silicon decreases. Reason (R) Aluminium has positive temperature coefficient of resistivity and silicon has negative temperature coefficient of resistivity.

What is the resistance between P and Q ?

What is the effective resistance between points P and Q?

The resistance across P and Q in the given figure is

The resistance across P and Q in the given figure is

The resistance across P and Q in the given figure is