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. A voltmeter with finite resistance is used to measure the potential difference across a resistor in a circuit. The measured reading of the voltmeter is _________.

Not possible to tell without further information.

Greater than the actual potential difference.

Equal to the actual potential difference.

Smaller than the actual potential difference.

2. 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?

6 mV

60 mV

0.6 mV

0.06 mV

3. A plug connected to a table lamp contains a 3 A fuse. The fuse is needed

to increase the resistance of the circuit

to protect the wiring from overheating

to reduce the voltage across the lamp

to make it easier for the current to flow

4. An electric heater consists of a heating element mounted on a metal reflector. The reflector is connected to earth.

Where should the switch for the heating element be connected?

between the neutral wire and the heating element

between the earth wire and the reflector

between the live wire and the neutral wire

between the live wire and the heating element

5. A combined bathroom unit of a heater and a lamp is controlled by one switch. The unit contains a 2 kW heater and a 100 W lamp. In one week, the lamp uses 1 kWh of electrical energy.

How much electrical energy is used by the heater alone?

10 kWh

20 kWh

2 kWh

4 kWh

6. Two insulated metal spheres X and Y are initially in contact. While a positively charged rod is near X, the spheres are moved apart. After this action X has a negative charge.

The charge on Y will be:

negative and smaller than that on X.

negative and the same size as that on X.

positive and smaller than that on X.

positive and the same size as that on X.

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

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

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.

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

8. 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 very hot

The fuse melts and switches off the circuit

The metal case becomes live and dangerous

The current flows to earth and the fuse is not affected

9. What is electric current?

rate of flow of power.

rate of change of resistance.

rate of flow of charge.

rate of change of voltage.

10. An electric kettle is plugged in and switched on. The fuse in the plug blows immediately.

Which single fault could cause this?

The live wire and neutral wire connections in the plug are swapped around.

The live wire touches the metal case of the kettle.

The wires connected to the plug are too thin.

The earth wire is not connected to the kettle.

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