Practice MCQs For For Static Electricity, Current Electricity, D.C. Circuits and Practical Electric Circuitry

This quiz contains practice questions for GCE ‘O’ level topics: Static Electricity, Current Electricity, D.C. Circuits and Practical Electric Circuitry. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish to contribute questions to this quiz, please contact us.

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1. Which of the following statements correctly interpret the meaning of 3 A?

3 C of charge flowing through a point in 1 second.

3 C of charge flowing through a point.

3 V of electricity causing 1 C of charge to flow.

3 V of electricity across $1 \, \Omega$ of resistance.

2. Which of the following devices' main purpose is NOT to provide safety to users of electricity?

Fuse.

Earth leakage circuit breaker.

Transformer.

Miniature circuit breaker.

3. The case of an electric fan is earthed. The plug to the fan contains a 5 A fuse. There is a current of 4 A when the fan works normally.

The cable to the fan becomes so worn that the live wire makes electrical contact with the metal case.

What happens?

The metal case becomes live and dangerous

The fuse melts and switches off the circuit

The current flows to earth and the fuse is not affected

The metal case becomes very hot

4. A resistor has 3 A current flowing through it. How much charge has flown through the resistor in 4 seconds?

6 C

18 C

12 C

3 C

5. A cell is connected to a resistor.

What is the e.m.f. of the cell equal to?

The power produced in the circuit for each unit of charge that passes.

The work done in the circuit for each unit of current.

The potential difference across the resistor for each unit of current.

The work done in the circuit for each unit of charge that passes.

6. A wire of length l and cross-sectional area A has a resistance R. The same amount of material is used to make a wire twice as long.

What is the resistance of the new wire?

R

$\frac{R}{4}$

$\frac{R}{2}$

2R

4R

7. Diagram 1 shows a resistor with resistance R connected to a battery, an ammeter and a voltmeter.

The ammeter reading is $A_{1}$ and the voltmeter reading is $V_{1}$.

A 3 identical resistors are now connected with the first resistor, as shown in diagram 2.

What are the ammeter (A) and voltmeter (V) readings in the circuit shown in diagram 2?

 

(Hint: Current only flows when there is a potential difference.)

$A = \frac{1}{4} A_{1}$ ; $V = \frac{1}{2} V_{1}$

A = 0 ; $V = \frac{1}{2} V_{1}$

$A = A_{1}$ ; $V = \frac{1}{2} V_{1}$

$A = \frac{1}{2} A_{1}$ ; $V = V_{1}$

8. Which factors will both increase the resistance of a wire in a circuit?

	Size of wire	Temperature of wire
A	Longer	Lower
B	Shorter	Lower
C	Thicker	Higher
D	Thinner	Higher

B

A

C

D

9. An electrical quantity is defined as 'the energy converted by a source in driving a unit charge round a complete circuit.'

What is this quantity called?

potential difference

power

current

electromotive force

10. The diagram shows a voltmeter adapted to measure a range from 0 - 100 mV. The voltmeter is measuring the potential difference in a circuit.

What is the reading on the voltmeter?

0.6 mV

60 mV

0.06 mV

6 mV

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