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4.3 Electric Circuits & Electrical Safety
Question Paper
Course CIE IGCSE Physics
Section 4. Electricity & Magnetism
Topic 4.3 Electric Circuits & Electrical Safety
Difficulty Hard
Time allowed: 20
Score: /10
Percentage: /100
Page 1 of 8
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Question 1
A homeowner buys a security light that switches on automatically when it gets dark.
The security light contains the circuit, shown below.
When it gets dark, what happens to the resistance of the LDR, and what happens to the potential difference across the LDR?
Resistance of LDR p.d. across LDR
A increases increases
B decreases increases
C increases decreases
D decreases decreases
[1 mark]
Page 2 of 8
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Question 2
A student sets up four circuits containing diodes. These circuits are shown below.
Which of the circuits will produce a rectified current through the bulb?
[1 mark]
Question 3
Two resistors are connected in parallel.
What is the combined resistance of the combination?
A. 20 Ω
B. 4.8 Ω
C. 0.21 Ω
D. 1.5 Ω
[1 mark]
Page 3 of 8
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Question 4
Two resistors are connected in parallel.
The current through the top resistor is 2.0 A.
What is the reading on the ammeter?
A. 6.0 A
B. 2.0 A
C. 4.0 A
D. 3.5 A
[1 mark]
Page 4 of 8
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Question 5
A 10 Ω and a 30 Ω resistor are connected in series, as shown in the diagram below, making a potential divider circuit.
What would be the reading on the voltmeter?
A. 2.0 V
B. 6.0 V
C. 4.0 V
D. 8.0 V
[1 mark]
Page 5 of 8
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Question 6
Which of the following statements about the current in ammeters X, Y and Z is correct?
A. The current through X equals the current through Y + the current through Z.
B. The current through X is equal to the current through Z.
C. The current through X is equal to the current through Y.
D. The current through Y is greater than the current through Z.
[1 mark]
Question 7
All the light bulbs in the diagrams above are identical. Each one is rated as
‘10 W 230 V’.
In which of the diagrams are all the bulbs working at their normal brightness?
[1 mark]
Page 6 of 8
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Question 8
A student connects together some identical resistors in three different combinations, as shown in the diagram.
Which of the answers below shows the correct order of the combinations from the lowest resistance to the highest?
A. P → Q → R
B. Q → P → R
C. Q → R → P
D. P → R → Q
[1 mark]
Question 9
A teacher writes a set of notes about two non-identical bulbs which are connected in parallel.
He makes one mistake. Which of the statements below is incorrect?
A. They have the same current flowing through them.
B. They have the same potential difference across them.
C. They can be switched on and off individually.
D. If one bulb blows, the other will continue to work.
[1 mark]
Page 7 of 8
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Question 10
A person wants to install a circuit breaker to protect themselves and their lawnmower from too much current.
Under normal operating conditions, the lawnmower carries 4 A of current.
The manufacturer provides the graph below with the circuit breaker.
What will happen when the current is 4 A, and what will happen if the current rises to 14 A?
4A 14 A
A circuit does not break circuit does not break
B circuit does not break circuit breaks quickly
C circuit breaks quickly circuit does not break
D circuit breaks quickly circuit breaks quickly
[1 mark]
Page 8 of 8
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