The variations of resistivity $\rho$ with absolute temperature T for three different materials $\mathrm{X}, \mathrm{Y}$ and Z are shown in the graph below. Identify the materials $\mathrm{X}, \mathrm{Y}$ and Z .

Given, a current carrying wire of non-uniform cross-section, which of the following is constant throughout the length of wire?

The graph between variation of resistance of a metal wire as a function of its diameter keeping other parameters like length and temperature constant is

Two similar galvanometers are covered into an ammeter and a milliammeter. The shunt resistance of ammeter as compared to the shunt resistance of milliammeter will be