Electricity Practice Questions
HSC/SSC (Bangladesh) · HSC Physics · 136 free MCQs with instant results and detailed explanations.
136
Total
28
Easy
84
Medium
24
Hard
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Sample Questions from Electricity
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Q1
Easy
If a resistor has a resistance of 5 ohms and a current of 2 amperes flows through it, what is the voltage across the resistor?
A.
10 Volts
B.
5 Volts
C.
2 Volts
D.
15 Volts
Show Answer & Explanation
Correct Answer: A
According to Ohm's Law (V = I * R), the voltage (V) across a resistor can be calculated by multiplying the current (I) by the resistance (R). So, V = 2A * 5ฮฉ = 10V.
Q2
Easy
If a circuit has a voltage of 12V and a resistance of 4ฮฉ, what is the current flowing in the circuit?
A.
3 A
B.
4 A
C.
12 A
D.
48 A
Show Answer & Explanation
Correct Answer: A
Using Ohm's Law (V = I ร R), we can rearrange it to find current, I = V / R. Therefore, I = 12V / 4ฮฉ = 3 A.
Q3
Easy
Which of the following devices converts electrical energy into mechanical energy?
A.
Transformer
B.
Generator
C.
Motor
D.
Capacitor
Show Answer & Explanation
Correct Answer: C
An electric motor converts electrical energy into mechanical energy by utilizing electromagnetic forces to create motion.
Q4
Medium
What happens to the resistance of a conductor when its temperature increases?
A.
Resistance decreases
B.
Resistance increases
C.
Resistance remains constant
D.
Resistance fluctuates
Show Answer & Explanation
Correct Answer: B
As the temperature of a conductor increases, the atoms vibrate more vigorously, which increases the chances of collisions between free electrons and the atoms, leading to an increase in resistance.
Q5
Medium
In a series circuit with two resistors of 6ฮฉ and 3ฮฉ, what is the total resistance?
A.
9ฮฉ
B.
18ฮฉ
C.
2ฮฉ
D.
3ฮฉ
Show Answer & Explanation
Correct Answer: A
In a series circuit, the total resistance (R_total) is the sum of the individual resistances. Therefore, R_total = R1 + R2 = 6ฮฉ + 3ฮฉ = 9ฮฉ.
Q6
Medium
What is the effect of connecting a capacitor in parallel with a resistor in a DC circuit?
A.
Increases current indefinitely
B.
Stores charge and blocks direct current
C.
Short-circuits the resistor
D.
Decreases voltage across the resistor
Show Answer & Explanation
Correct Answer: B
When a capacitor is connected in parallel to a resistor in a DC circuit, it charges up to the supply voltage and blocks the direct current after being fully charged, effectively storing energy.
Q7
Medium
A resistor of 5 ohms is connected in series with a 10 ohm resistor. What is the total resistance in the circuit?
A.
15 ohms
B.
5 ohms
C.
10 ohms
D.
25 ohms
Show Answer & Explanation
Correct Answer: A
In a series circuit, the total resistance is the sum of individual resistances. Here, 5 ohms + 10 ohms = 15 ohms.
Q8
Hard
A circuit consists of a 12 V battery connected in series with a 4 ฮฉ resistor and a 2 ฮฉ resistor. What is the total current flowing through the circuit?
A.
2 A
B.
3 A
C.
4 A
D.
6 A
Show Answer & Explanation
Correct Answer: A
The total resistance in the circuit is 4 ฮฉ + 2 ฮฉ = 6 ฮฉ. According to Ohm's Law (V = IR), the total current I can be calculated as I = V/R = 12 V / 6 ฮฉ = 2 A.
Q9
Hard
Two capacitors, C1 = 3 ฮผF and C2 = 6 ฮผF, are connected in parallel. What is the total capacitance of the combination?
A.
2 ฮผF
B.
3 ฮผF
C.
9 ฮผF
D.
18 ฮผF
Show Answer & Explanation
Correct Answer: C
For capacitors in parallel, the total capacitance is the sum of the individual capacitances: C_total = C1 + C2 = 3 ฮผF + 6 ฮผF = 9 ฮผF.
Q10
Hard
A circuit consists of a 12V battery connected in series with a 4ฮฉ resistor and a 6ฮฉ resistor. What is the current flowing through the circuit?
A.
0.8 A
B.
1.2 A
C.
2.0 A
D.
1.0 A
Show Answer & Explanation
Correct Answer: B
Using Ohm's Law, the total resistance in the series circuit is 4ฮฉ + 6ฮฉ = 10ฮฉ. The current can be calculated using I = V/R, where V = 12V and R = 10ฮฉ, giving I = 12V / 10ฮฉ = 1.2 A.
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Electricity โ HSC/SSC (Bangladesh) HSC Physics Practice Questions Online
This page contains 136 practice MCQs for the chapter Electricity in HSC/SSC (Bangladesh) HSC Physics. The questions are organized by difficulty โ 28 easy, 84 medium, 24 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.