In the circuit shown, the current drawn by the cell is

In the metre bridge experiment, the null point is obtained at $N.$ The value of unknown resistance $X$ will be

Which of the following materials obeys the nature of given voltage-current $(V-I)$ graph under constant temperature?

The equivalent resistance between the points A and B is

In the given circuit, total power consumed is $200 \mathrm{W}$. The value of resistance $R$ is

The emf of a cell is $1.6 \mathrm{V}$. On connecting external $15\Omega$ resistance across the cell, the terminal potential difference falls to $1.5 \mathrm{V}$. The internal resistance of the cell is