Electricity Practice Questions
Thanaweya Amma (Egypt) · Thanaweya Physics · 130 free MCQs with instant results and detailed explanations.
130
Total
23
Easy
85
Medium
22
Hard
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Sample Questions from Electricity
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Q1
Easy
If a resistor of 5 ohms is connected across a 10V battery, what is the current flowing through the resistor?
A.
0.5 A
B.
2 A
C.
5 A
D.
10 A
Show Answer & Explanation
Correct Answer: B
Using Ohm's Law (V = IR), the current can be calculated as I = V/R = 10V / 5ฮฉ = 2A.
Q2
Easy
What happens to the resistance of a conductor as its temperature increases?
A.
Resistance decreases
B.
Resistance remains constant
C.
Resistance increases
D.
Resistance becomes negative
Show Answer & Explanation
Correct Answer: C
As the temperature of a conductor increases, its resistance typically increases due to increased vibrations of atoms, impeding electron flow.
Q3
Easy
What happens to the electric resistance of a conductor when its temperature increases?
A.
It decreases
B.
It remains the same
C.
It increases
D.
It fluctuates
Show Answer & Explanation
Correct Answer: C
In most conductors, an increase in temperature leads to increased resistance due to higher atomic vibrations.
Q4
Medium
What happens to the resistance of a conductor if its temperature is increased?
A.
Resistance decreases
B.
Resistance increases
C.
Resistance remains constant
D.
Resistance fluctuates randomly
Show Answer & Explanation
Correct Answer: B
As the temperature of a conductor increases, the atoms vibrate more, causing more collisions with the charge carriers, which increases resistance.
Q5
Medium
If two resistors, 3ฮฉ and 6ฮฉ, are connected in series, what is the total resistance?
A.
3ฮฉ
B.
6ฮฉ
C.
9ฮฉ
D.
12ฮฉ
Show Answer & Explanation
Correct Answer: C
In a series connection, the total resistance is the sum of the individual resistances: R_total = R1 + R2 = 3ฮฉ + 6ฮฉ = 9ฮฉ.
Q6
Medium
What is the role of a capacitor in an AC circuit?
A.
To store electrical energy
B.
To increase resistance
C.
To convert AC to DC
D.
To decrease current
Show Answer & Explanation
Correct Answer: A
A capacitor stores electrical energy in an electric field when connected to a voltage source, allowing it to release energy when needed in AC circuits.
Q7
Medium
If the voltage across a resistor is doubled, what happens to the power dissipated by the resistor?
A.
It doubles
B.
It triples
C.
It quadruples
D.
It remains the same
Show Answer & Explanation
Correct Answer: C
Power in a resistor is given by P = V^2/R. If voltage (V) is doubled, power becomes P' = (2V)^2/R = 4V^2/R, which is quadrupled.
Q8
Hard
A 1000-watt heater is operated for 3 hours. How much electrical energy is consumed in kilowatt-hours (kWh)?
A.
3 kWh
B.
5 kWh
C.
4 kWh
D.
2 kWh
Show Answer & Explanation
Correct Answer: A
Energy consumed (in kWh) is calculated by multiplying the power (in kW) by the time (in hours). The heater uses 1 kW and runs for 3 hours, so Energy = 1 kW * 3 hours = 3 kWh.
Q9
Hard
A copper wire has a resistance of 10 ฮฉ at 20ยฐC. If the temperature coefficient of resistance for copper is 0.004 ฮฑ/ยฐC, what will be the resistance of the wire at 80ยฐC?
A.
12 ฮฉ
B.
14 ฮฉ
C.
10 ฮฉ
D.
16 ฮฉ
Show Answer & Explanation
Correct Answer: A
The resistance increases with temperature. Using the formula R_t = R_0(1 + ฮฑ(T - T_0)), where R_0 is the resistance at T_0, ฮฑ is the temperature coefficient, T is the new temperature, we find that R_80 = 10(1 + 0.004(80 - 20)) = 12 ฮฉ.
Q10
Hard
A circuit consists of a 12V battery connected to two resistors, R1 = 4ฮฉ and R2 = 6ฮฉ in parallel. What is the total current flowing in the circuit?
A.
2A
B.
4A
C.
6A
D.
8A
Show Answer & Explanation
Correct Answer: C
In a parallel circuit, the total resistance (R_total) is calculated using the formula 1/R_total = 1/R1 + 1/R2. Thus, 1/R_total = 1/4 + 1/6, which gives R_total = 2.4ฮฉ. Using Ohm's law (I = V/R), the total current I = 12V / 2.4ฮฉ = 5A.
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Electricity โ Thanaweya Amma (Egypt) Thanaweya Physics Practice Questions Online
This page contains 130 practice MCQs for the chapter Electricity in Thanaweya Amma (Egypt) Thanaweya Physics. The questions are organized by difficulty โ 23 easy, 85 medium, 22 hard โ so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.