ESE-2018 Electrical Engineering Quiz 1

The fuse material used in electrical lines must have which one of the following properties?

The materials not having negative temperature coefficient of resistivity are

The resistivity of a metal is a function of temperature because

The free electrons in a metal follow the kinetic theory of gases and the following statements are made about their properties:
1) The velocity of all the electrons is equal.
2) The electron have a velocity distribution ranging from zero to infinity.
3) The average velocity of electron gas is proportional to (T = temperature).
4) The maximum velocity of electrons is proportional to T.
Which of these statements are correct?

Assertion (A): Good conductors do not show superconductivity.
Reason (R): Electron-phonon interaction that leads to formation of Cooper pairs is weak in good conductors.