The variation of current $(i)$ and voltage $(V)$ in a conductor is shown in the diagram below. The resistance of the conductor is ........... $\Omega$.

The current in a metallic conductor is plotted against voltage at two different temperatures $T_1$ and $T_2$. Which of the following is correct?

What conclusion can you draw from the following observations on a resistor made of alloy manganin?

$I (A)$	$V (V)$	$I (A)$	$V (V)$
$0.2$	$3.94$	$3.0$	$59.2$
$0.4$	$7.87$	$4.0$	$78.8$
$0.6$	$11.8$	$5.0$	$98.6$
$0.8$	$15.7$	$6.0$	$118.5$
$1.0$	$19.7$	$7.0$	$138.2$
$2.0$	$39.4$	$8.0$	$158.0$

An electric wire is connected across a cell of $e.m.f.$ $E$. The current $I$ is measured by an ammeter of resistance $R$. According to Ohm's law,which of the following relations is correct?

If the resistance of a wire is $50\,\Omega$,the graph between $\log\ V$ and $\log\ I$ is........

Which of the following graphs represents an ohmic resistance?