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

Correct answer: 1. Increases

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

Correct answer: 3. Carbon

Unit of electrical charge in SI system is

SI Unit of electrical charge is:

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

Correct answer: 2. Coulomb

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

Correct answer: 2. Ω-m

A substance having number of valence electrons less than 4 is usually

A substance having number of valence electrons less than 4 is usually

1. An insulator
2. A semiconductor
3. A conductor
4. None of the above

Correct answer: 3. A conductor

See complete list of Basic Electrical Engineering MCQs