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Physics for IGCSE & O level - Electricity (Section 6)

1
How does the current split in a parallel circuit?
Answer
(B)
It splits at each junction.
2
Which factor determines the amount of current flowing through a conductor?
Answer
(A)
Voltage and resistance
3
What factors affect the resistance of a wire?
Answer
A
B
C
D
4
What kind of charge does a battery's positive terminal have?
Answer
(B)
Positive
5
If you want the current to split and continue through different paths what circuit configuration would you use?
Answer
(B)
Parallel
6
What is the frequency of the mains electricity in the United States?
Answer
(B)
60 Hz
7
What is an advantage of parallel circuits compared to series circuits?
Answer
(B)
All components share the same voltage.
8
If an appliance is rated at 230V and 1000W, what is the current it draws?
Answer
(B)
4.35 A
9
Which of the following best describes how the brightness of a bulb is affected by the current passing through it?
Answer
(C)
Brightness increases with increasing current.
10
What is the relationship between p.d. and current in a metallic conductor?
Answer
(A)
Directly proportional
11
What happens if a series circuit is broken?
Answer
(C)
Current will stop
12
If a 12 V battery provides 2 A of current, how much power is being supplied?
Answer
(C)
24 W
13
If you want to increase the brightness of the lamps, should the lamps be connected in series or parallel?
Answer
(B)
Parallel
14
Which of the following best describes a double insulated appliance?
Answer
(C)
It has extra insulation to prevent electric shock.
15
If two resistors are connected in series, and one resistor is 10 ohms and the other is 20 ohms, what is the total resistance?
Answer
(C)
30 ohms
16
If you have a 12V battery and connect a 2-ohm resistor to it, what is the current flowing through the resistor?
Answer
(A)
6 A
17
How does increasing the cross-sectional area of a wire affect its resistance?
Answer
(B)
Decreases resistance
18
Which of these can be used as a fire alarm?
Answer
(A)
A reed switch
19
What is the function of a capacitor in a circuit?
Answer
(B)
To store electrical energy
20
What is the correct unit of charge?
Answer
(C)
Coulomb
21
What does 'AC' stand for in the context of electricity?
Answer
(A)
Alternating Current
22
What type of charge does an object have after rubbing?
Answer
(D)
Depends on the material
23
Which of these affects the resistance of a wire?
Answer
A
B
C
24
What is the name given to the space around a charged object, where another charge would feel a force?
Answer
(B)
Electric field
25
What are some circuit components listed below?
Answer
(D)
All of the above
26
What is the function of a switch in an electrical circuit?
Answer
(C)
To control the flow of current
27
What type of charge is transferred during electrostatic charging?
Answer
(C)
Electrons
28
What are the typical colors used for live, neutral, and earth wires in the UK?
Answer
(C)
Brown, blue, green/yellow
29
What happens when you rub a polythene rod with a cloth?
Answer
(C)
The rod gains negative charge.
30
What type of switch is activated by a magnetic field?
Answer
(C)
Reed switch
31
In a series circuit with three resistors, what is the total resistance?
Answer
(A)
The sum of the individual resistances.
32
What does the power rating of an appliance indicate?
Answer
(C)
The rate at which it consumes energy.
33
What are some applications of electrostatic charge?
Answer
A
B
C
34
In an AC circuit, what is the role of the neutral wire?
Answer
(A)
Provides a path for the flow of current back to the source
35
What is the function of a rectifier?
Answer
(C)
To change alternating current to direct current
36
In a parallel circuit, what happens to the current if a component is removed?
Answer
(A)
The total current in the circuit decreases
37
What does a light-dependent resistor do?
Answer
(B)
Changes resistance based on light
38
What happens to the power dissipated by a resistor if the voltage across it is doubled?
Answer
(C)
The power quadruples
39
What is the SI unit for electric charge?
Answer
(C)
Coulomb
40
What are the two types of electric charge?
Answer
(C)
Positive and Negative
41
What is the purpose of a fuse in a circuit?
Answer
(B)
To prevent overcurrent
42
Which of the following is a component that allows current to flow in only one direction?
Answer
(C)
Diode
43
What unit is used to measure electric current?
Answer
(C)
Ampere
44
What are the components in series?
Answer
(A)
the current is the same
45
What happens to the total resistance of a circuit when you add a resistor in series?
Answer
(A)
It increases.
46
What will happen if you connect the two terminals of a battery with a wire?
Answer
(B)
The battery will get hot and the wire will get hot.
47
If a fuse blows in a circuit, what does this indicate?
Answer
(B)
The current is too high
48
What is the definition of potential difference (p.d.)?
Answer
(C)
The work done per unit charge
49
Which of the following is a unit of electrical energy?
Answer
(D)
Kilowatt-hour
50
What is the equivalent resistance of two 2-ohm resistors in parallel?
Answer
(A)
1 ohm