Physics for IGCSE & O level - Electricity (Section 1)
1
Which of the following is the most common type of fuse?
Хариулт
(B)
Thermal Fuse
2
What happens to the current in a circuit if the voltage is held constant and the resistance is increased?
Хариулт
(B)
The current decreases.
3
What happens if the current flowing through a resistor increases?
Хариулт
(C)
The power dissipated by the resistor increases.
4
If the length of a wire is doubled, what happens to its resistance (assuming other factors are constant)?
Хариулт
(A)
Doubles
5
What is the purpose of the neutral wire in a three-core cable?
Хариулт
(A)
To provide a path for the current to return to the source.
6
What is the unit for measuring electrical power?
Хариулт
(D)
Watt
7
What is the name of the point where two or more components connect in a circuit?
Хариулт
(A)
Node
8
Which of the following is a unit of electrical energy?
Хариулт
(C)
Joule
9
What is the unit for measuring electrical charge?
Хариулт
(C)
Coulomb
10
What does the abbreviation LED stand for?
Хариулт
(A)
Light Emitting Diode
11
What is the effect of adding more resistors in series in a circuit?
Хариулт
(B)
The total resistance increases.
12
If two resistors are connected in parallel, and one resistor has a resistance of 10 ohms and the other has a resistance of 20 ohms, what is the total resistance?
Хариулт
(B)
6.67 ohms
13
What best describes electric charge?
Хариулт
(D)
Properties
14
What is measured in units of Watts?
Хариулт
(D)
Power
15
How does the length of a wire affect its resistance?
Хариулт
(C)
Longer wire, higher resistance
16
What is the unit for measuring electrical energy?
Хариулт
(C)
Joule
17
Which of the following would become charged by rubbing it with a dry, wool cloth?
Хариулт
(A)
PVC
18
In a parallel circuit, what happens to the total resistance if you add another resistor?
Хариулт
(A)
Decreases
19
What kind of materials are electrical conductors?
Хариулт
(A)
Metals
20
What is the role of a double insulated appliance?
Хариулт
(A)
It does not have an earth wire
21
What happens to the total resistance in a series circuit if a resistor is replaced with one of a higher resistance value?
Хариулт
(A)
The total resistance increases.
22
In an electric circuit, what is the function of an inductor?
Хариулт
(B)
To oppose changes in current
23
What is the relationship between current (I), voltage (V), and resistance (R) in a circuit?
Хариулт
(A)
V = I * R
24
In a circuit, the battery supplies energy which is transformed to the...
Хариулт
(A)
Lamp
25
What is the term for the number of times the direction of current changes per second?
Хариулт
(B)
Frequency
26
What are the two types of electric charge?
Хариулт
(A)
Positive and negative
27
What will happen if one of the lamps in the series circuit breaks?
Хариулт
(B)
All lamps will not light
28
What type of meter is used to measure current?
Хариулт
(C)
An ammeter
29
What are the advantages of arranging some circuits in series?
Хариулт
B
D
30
What is the relationship between the current and voltage in a resistor, according to Ohm's law?
Хариулт
(B)
They are directly proportional.
31
What happens to the brightness of a lightbulb if the voltage across it increases?
Хариулт
(B)
The bulb gets brighter.
32
Which circuit setup allows the full battery potential difference (p.d.) to reach each lamp?
Хариулт
(B)
Parallel
33
Which of the following is a feature of double insulation?
Хариулт
(C)
Provides two layers of insulation
34
How is the resistance of a conductor calculated?
Хариулт
(B)
R = V / I
35
What is the function of a transformer?
Хариулт
(B)
To change the voltage of an AC supply
36
What is the function of a variable resistor?
Хариулт
(B)
To change the current in the circuit.
37
Which of the following is used to step-up (increase) or step-down (decrease) voltage?
Хариулт
(C)
Transformer
38
Which of the following is a non-linear circuit element?
Хариулт
(C)
Diode
39
What is the equivalent resistance of two 2-ohm resistors connected in parallel?
Хариулт
(A)
1 ohm
40
How is the total current related in a parallel circuit?
Хариулт
(B)
The total current is the sum of the currents in each branch.
41
What is the purpose of using multiple parallel paths in a circuit?
Хариулт
(C)
To provide multiple current paths
42
What safety device is designed to protect appliances from overloads and short circuits?
Хариулт
(C)
Fuse
43
What does a light emitting diode (LED) do?
Хариулт
(A)
Emits light when a current flows through it.
44
Which component allows current to flow in only one direction?
Хариулт
(C)
Diode
45
Which of the following is a typical household appliance that uses a high current?
Хариулт
(B)
An electric iron
46
Which of the following is the unit for electrical charge?
Хариулт
(C)
Coulomb
47
Which component is designed to limit the current in a circuit?
Хариулт
(C)
A resistor
48
Which of the following components is a passive component?
Хариулт
(D)
Resistor
49
What is the purpose of a fuse in a circuit?
Хариулт
(B)
To protect the circuit from overcurrent
50
What is the main function of a capacitor in a circuit?
