The conductivity of a conductor decreases with temperature because,on heating:

$A$ wire of a certain material is stretched slowly by $10\%$. Its new resistance and specific resistance become respectively:

Arrange the following materials in increasing order of their resistivity: Nichrome,Copper,Germanium,Silicon.

Resistance of a wire is $8 \Omega$. It is drawn in such a way that it experiences a longitudinal strain of $400 \%$. The final resistance of the wire is (in $\Omega$)

Which of the following graphs represents the variation of resistivity ( $\rho$ ) with temperature $(T)$ for copper?

The resistance of a rectangular block of copper of dimensions $2 \,mm \times 2 \,mm \times 5 \,m$ between two square faces is $0.02 \,\Omega$. What is the resistivity of copper?