Questions in Current Electricity

Select	Question
	The positive temperature coefficient of resistance is for
	The fact that the conductance of some metals rises to infinity at some temperature below a few Kelvin is called
	Dimensions of a block are $1\,cm \times 1\,cm \times 100\,cm$. If specific resistance of its material is $3 \times {10^{ - 7}}ohm - m$, then the resistance between the opposite rectangular faces is
	Dimensions of a block are $1\,cm \times 1\,cm \times 100\,cm$. If specific resistance of its material is $3 \times {10^{ - 7}}ohm - m$, then the resistance between the square faces is
	There is a current of 20 amperes in a copper wire of ${10^{ - 6}}$ square metre area of cross-section. If the number of free electrons per cubic metre is ${10^{29}}$, then the drift velocity is
	The electric intensity $E$, current density $j$ and specific resistance $k$ are related to each other by the relation
	The resistance of a wire of uniform diameter $d$ and length $L$ is $R$. The resistance of another wire of the same material but diameter and length $4L$ will be
	There is a current of 1.344 amp in a copper wire whose area of cross-section normal to the length of the wire is 1$m{m^2}$. If the number of free electrons per $c{m^3}$ is $8.4 \times {10^{22}}$, then the drift velocity would be
	It is easier to start a car engine on a hot day than on a cold day. This is because the internal resistance of the car battery
	5 amperes of current is passed through a metallic conductor. The charge flowing in one minute in coulombs will be