# Basic Electrical Engineering MCQs Part 31

Basic Electrical Engineering MCQs Part 31

## The quantity of charge that needs to be delivered by a battery having potential difference of 12 V for doing a work of 240 J

The quantity of charge that needs to be delivered by a battery having potential difference of 12 V for doing a work of 240 J:

1. 1 C
2. 5 C
3. 10 C
4. 20 C

Explanation

Q = W/V = 240 / 12 = 20 C

## An electric kettle is marked 2000 W, 200 V. The resistance of coil is

An electric kettle is marked 2000 W, 200 V. The resistance of coil is:

1. 0.2 Ω
2. 20 Ω
3. 200 Ω
4. 400 Ω

Formula:

P = V2/R or R = V2/P

R = (200)2/2000 = 20 Ω

## Charge on one electron is

Charge on one electron is:

1. 1.602 * 10-19
2. 1.592 * 10-39
3. 1.295 * 10-12
4. 1.874 * 10-3

Correct answer: 1. 1.602 * 10-19

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

Writing in the form of equation:

1 C = 6.24 * 1018  electrons

Or 1 electron = 1C/6.24 * 1018   = 1.602 * 10-19 C

## Which of following is a scalar quantity

Which of following is a scalar quantity:

1. Electrical field
2. Electric potential
3. Electric displacement density
4. Electric Force
5. All of these