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