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. 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?

power

potential difference

current

electromotive force

2. A cell is connected to a resistor.

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

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

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

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

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

3. A battery containing 1200 C of charge is connected to a circuit. What is the time taken to discharge the battery if the current in the circuit is 6 A?

200 seconds

200 hours

2 hours

20.0 seconds

4. A $24 \, \Omega$ resistor is to be connected in series with a 12 V battery.

What is the power loss in the resistor?

24 W

0.5 W

6 W

12 W

5. X and Y are lamps with filaments made from the same material.

The filament of lamp X is thicker and shorter than that of lamp Y.

When connected to the mains and switched on, which is the brighter lamp and which lamp has the larger resistance?

C

D

B

A

6. Which diagram correctly shows the electric field lines between two point charges?

D

B

C

A

7. A small heater operates at 12 V, 2 A.

How much energy will it use when it is run for 5 minutes?

7200 J

30 J

1800 J

120 J

8. A $1.0 \, \Omega$ resistor and a $2.0 \, \Omega$ resistor are connected in series across a 12 V D.C. supply.

What is the current in the circuit?

12 A

6.0 A

4.0 A

0.25 A

9. 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 current flows to earth and the fuse is not affected

The metal case becomes very hot

The fuse melts and switches off the circuit

10. In an a.c. electric circuit in a house, the switch for any device is always connected to the 'live' lead. Why is this?

The device will be shorted if the switch is in the earth lead.

The device can never be switch off if the switch is in the neutral lead.

No current ever flows in the neutral lead of the device.

The device can only be isolated (made safe) if the switch is in the live lead.

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