# Basic Electrical Engineering MCQs Part 30

Basic Electrical Engineering MCQs Part 30

## With rise in temperature, the specific resistance of metallic conductor

With rise in temperature, the specific resistance of metallic conductor _________

1. Increases
2. Decreases
3. Remains the constants
4. None of these

Explanation:

The specific resistance of a metallic conductor increases with an increase in temperature. This is due to the fact that the thermal velocity of the free electrons increases as the temperature increases. This results in an increase in the number of collisions between the free electrons.

## With an increase in temperature, the resistance decreases in case of

With an increase in temperature, the resistance decreases in case of:

1. Copper
2. Silver
3. Carbon
4. None of these

## Unit of electrical charge in SI system is

SI Unit of electrical charge is:

1. Newton
2. Coulomb
3. Tesla
4. Watts

Explanation: Coulomb is defined as the charge carried by 6.24 X 1018 electrons.

If an electrically neutral/uncharged body has 6.24 X 1018 electrons removed, it will be left with a net positive charge of 1 coulomb. Simply saying Q = 1 C

## Specific resistance of a substance is measured in

Specific resistance of a substance is measured in

1. Ω/m
2. Ω-m
3. Ω/m2
4. m/Ω