1
1 mark
1 markThis is the circuit symbol for which component?
A fuse
A buzzer
A transistor
A relay
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Electric Circuits (Cambridge O Level Physics)
Exam Questions
3 hours36 questions21 mark
1 markWhich of the following circuit symbols is for a thermistor?
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31 mark
1 markWhich diagram shows the correct symbol for a diode, and the correct direction of current moving through it?
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11 mark
1 markThe diagram shows two resistors connected in series with a battery.
What is the current through the battery?
1.5 A
150 A
0.67 A
15 A
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21 mark
1 markA book shop owner sets up the circuit below, but they find that the lamp is too dim.
What change can be made to the circuit to increase the brightness of the bulb?
Putting another resistor in parallel with the battery.
Putting a resistor in parallel with the bulb.
Putting another resistor in series with the resistor.
Putting another resistor in parallel with the resistor.
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31 mark
1 markWhich electrical symbol represents a fuse?
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41 mark
1 markThree identical resistors are joined in series to a battery.
Voltmeter Q reads 8.0 V.
What is the reading on voltmeter P and what is the e.m.f. of the battery?
| Reading on P/V | E.m.f. of battery /V | |
| A | 4.0 | 8.0 |
| B | 4.0 | 12 |
| C | 8.0 | 8.0 |
| D | 8.0 | 12 |
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11 mark
1 markA 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 |
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21 mark
1 markA student sets up four circuits containing diodes. These circuits are shown below.
Which of the circuits will produce a rectified current through the bulb?
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31 mark
1 markTwo resistors are connected in parallel.
What is the combined resistance of the combination?
20 Ω
4.8 Ω
0.21 Ω
1.5 Ω
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41 mark
1 markTwo resistors are connected in parallel.
The current through the top resistor is 2.0 A.
What is the reading on the ammeter?
6.0 A
2.0 A
4.0 A
3.5 A
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51 mark
1 markA 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?
2.0 V
6.0 V
4.0 V
8.0 V
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61 mark
1 mark
Which of the following statements about the current in ammeters X, Y and Z is correct?
The current through X equals the current through Y + the current through Z.
The current through X is equal to the current through Z.
The current through X is equal to the current through Y.
The current through Y is greater than the current through Z.
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71 mark
1 mark
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?
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81 mark
1 markA 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?
P → Q → R
Q → P → R
Q → R → P
P → R → Q
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91 mark
1 markA 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?
They have the same current flowing through them.
They have the same potential difference across them.
They can be switched on and off individually.
If one bulb blows, the other will continue to work.
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