Assertion: The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased.

Reason: On increasing the temperature, conductivity of metallic wire decreases.

$\mathrm{I} - \mathrm{V}$ graphs for two different electrical appliances $P$ and $Q$ are shown in the diagram. If ${\mathrm{R}}_{\mathrm{P}}$ and $R_{\mathrm{Q}}$ be the resistances of the devices, then

In the given circuit, the current through $2 \mathrm{\Omega }$ resistor is

The effective resistance between $P$ and $Q$ for the following network is