Electrical wires are usually made by copper. Which properties of copper make it a suitable choice-

I) High electrical conductivity
II) Sonority
III) Ductility
IV) Metallic lustre

The potential difference between the two ends of a conductor is $V$, and the current flowing through the conductor is $I$. At a constant temperature, which of the following statement is true for the conductor?

In the given circuit the voltmeter reads 5V. The resistance of the voltmeter in Ohm is.

Following figures shows graph of $I-V$. Which graph is correct according to Ohm's law?

For a cell, a graph is plotted between the potential difference $V$ across the terminals of the cell and current $I$ drawn from the cell (see fig.) The emf and internal resistance of the cell are $E$ and $r$ respectively, then :

Which of the units given below is the SI unit of resistance?

The resistance of rheostat shown in the figure is $0-30 \mathrm{\Omega }$, Neglecting the resistance of ammeter and connecting wire the minimum and maximum currents through the ammeter will be

What is a superconductor?

Consider an infinite grid with square cells. The resistance between two adjacent joints is $R.$ Find the net resistance $R_{net}$ of the whole grid between two points A & B.

$\mathrm{V}-\mathrm{I}$ graph for parallel and series combinations for two identical resistors are as shown in figure.Which graph represents parallel combination?