Physics for IGCSE & O level - Electricity (Section 5)
1
What is the relationship between current and the number of parallel paths in a circuit?
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(B)
As the number of paths increases, the current increases
2
Which component is typically used to change the voltage of an AC supply?
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(C)
Transformer
3
What is a reed switch activated by?
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(C)
A magnet
4
Which of the following are correct about an appliance's power rating?
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A
B
C
5
What do charges do in a Van de Graaff generator?
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(B)
They become concentrated on the surface of a sphere
6
What are the components that constitute the basic circuit rules?
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A
B
C
7
What is the formula for calculating the total resistance of resistors in parallel?
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(B)
1/R_total = 1/R1 + 1/R2
8
Which of the following is a common example of a parallel circuit application?
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(C)
Household electrical wiring
9
In a series circuit, if one resistor has a voltage drop of 5V, and another has a voltage drop of 10V, what is the total voltage drop across both resistors?
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(C)
15V
10
Which statement best describes the role of a battery in a circuit?
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(C)
It provides the voltage (potential difference).
11
Which of the following describes a 'short circuit'?
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(B)
Low resistance and high current
12
What is the effect on the current in a circuit if the resistance is doubled while the voltage remains constant?
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(B)
Current halves
13
What is the frequency of the alternating current (AC) supply in most of Europe?
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(A)
50 Hz
14
What is the role of a live wire in a domestic electrical supply?
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(B)
It carries current to the appliance
15
What does the symbol 'Ω' represent in electrical circuits?
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(C)
Resistance
16
In a series circuit, if one component breaks, what happens to the rest of the circuit?
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(B)
The circuit stops working.
17
In a series circuit, if one component fails (breaks the circuit), what happens to the rest of the components?
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(B)
They also fail.
18
What is the unit of power?
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(C)
Watt
19
Which of the following are components of a simple circuit?
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A
B
C
D
20
If a lightbulb uses 100J of energy every second, what is its power?
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(A)
100 Watts
21
Which of the following is a symbol for a resistor?
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(D)
-///-
22
What are the parts of an atom?
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A
B
C
23
Which of the following is a source of AC electricity?
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(C)
A mains socket
24
In a circuit with a voltage source, a resistor, and a light bulb in series. If the resistance of the resistor increases, what happens to the brightness of the light bulb?
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(B)
The bulb will get dimmer.
25
How is resistance affected by material type?
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(C)
Different materials have varying resistance.
26
What is the standard voltage rating for a 3-pin plug in the UK?
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(C)
230V
27
Which of the following best describes the function of a variable resistor (rheostat)?
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(C)
To change the resistance in a circuit.
28
What happens to the overall resistance of a circuit if components are added in series?
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(B)
It increases
29
What is the purpose of the fuse in an electrical circuit?
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(C)
To break the circuit if the current exceeds a safe level.
30
What is the term for the opposition to the flow of electric current?
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(B)
Resistance
31
Which component opposes the flow of current in a circuit?
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(B)
Resistor
32
What is the unit used to measure resistance?
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(D)
Ohm
33
What is the effect of increasing the voltage in a circuit, assuming the resistance stays the same?
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(C)
The current increases
34
What component is used to block DC current and allow AC current to pass?
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(C)
Diode
35
In a parallel circuit, what is the same across all components?
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(A)
Voltage
36
Which of the following appliances is most likely to have a three-pin plug?
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(C)
A washing machine
37
If you plug a 1000W appliance into a 230V socket, how much current does it draw?
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(A)
4.35 A
38
What is a function of a fuse?
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(B)
To limit the current flow.
39
Which quantity is measured in Amperes (A)?
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(B)
Current
40
Which of the following is a unit of electrical power?
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(C)
Watt
41
What happens to the current in a series circuit if the voltage is increased and the resistance remains the same?
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(A)
The current increases
42
What are the units of voltage?
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(B)
Volts
43
What is the main purpose of an earth wire in an electrical appliance?
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(B)
To provide a path for fault current to flow to earth.
44
What is the effect of a double-insulated appliance regarding earthing?
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(B)
It does not require an earth wire.
45
What would be the consequence of a fuse having too high a current rating?
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(C)
The appliance could overheat and cause a fire.
46
Which of the following is a non-ohmic device?
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(C)
A diode
47
Which of the following factors does NOT affect the resistance of a wire?
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(D)
Weight
48
What is a key component in a simple circuit?
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(B)
Conductor
49
What happens to the current in a wire if the voltage is doubled and the resistance is halved?
