Electricity Practice Questions
SPM (Malaysia) · SPM Physics · 126 free MCQs with instant results and detailed explanations.
126
Total
25
Easy
78
Medium
23
Hard
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Sample Questions from Electricity
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Q1
Easy
If a circuit has a resistance of 10 ohms and a current of 2 amperes, what is the voltage across the circuit?
A.
5 Volts
B.
10 Volts
C.
20 Volts
D.
15 Volts
Show Answer & Explanation
Correct Answer: C
Using Ohm's law (V = I ร R), the voltage is calculated as V = 2 A ร 10 ฮฉ = 20 Volts.
Q2
Easy
Which of the following materials is considered a good conductor of electricity?
A.
Wood
B.
Copper
C.
Rubber
D.
Plastic
Show Answer & Explanation
Correct Answer: B
Copper is a good conductor of electricity, facilitating the flow of electric current efficiently.
Q3
Easy
If a circuit has a voltage of 12V and a resistance of 4ฮฉ, what is the current flowing through the circuit?
A.
3 Amperes
B.
12 Amperes
C.
48 Amperes
D.
0.33 Amperes
Show Answer & Explanation
Correct Answer: A
Using Ohm's Law (V = IR), where V is voltage, I is current, and R is resistance, we can rearrange it to find I = V/R. Thus, I = 12V / 4ฮฉ = 3 Amperes.
Q4
Medium
What happens to the resistance of a conductor if its length is doubled while keeping the material and temperature constant?
A.
It doubles.
B.
It halves.
C.
It remains the same.
D.
It quadruples.
Show Answer & Explanation
Correct Answer: A
Resistance is directly proportional to length; thus, doubling the length results in double the resistance.
Q5
Medium
A 12 V battery is connected in series with a resistor of 4 ohms. What is the current flowing through the circuit?
A.
3 A
B.
12 A
C.
0.33 A
D.
4 A
Show Answer & Explanation
Correct Answer: A
Using Ohm's law (I = V/R), with V = 12 V and R = 4 ohms, the current I = 12/4 = 3 A.
Q6
Medium
Two resistors, 6 ohms and 12 ohms, are connected in parallel. What is the equivalent resistance?
A.
4 ohms
B.
8 ohms
C.
2 ohms
D.
1.5 ohms
Show Answer & Explanation
Correct Answer: A
For parallel resistors, the formula is 1/R_eq = 1/R1 + 1/R2; thus, 1/R_eq = 1/6 + 1/12 = 1/4, leading to R_eq = 4 ohms.
Q7
Medium
What is the effect on the total current in a circuit if an additional resistor is added in series?
A.
Total current increases.
B.
Total current decreases.
C.
Total current remains the same.
D.
Total current fluctuates.
Show Answer & Explanation
Correct Answer: B
Adding a resistor in series increases total resistance, thereby decreasing total current, according to Ohm's law.
Q8
Hard
A circuit contains two resistors, R1 = 4 ฮฉ and R2 = 6 ฮฉ, connected in series. What is the total resistance of the circuit?
A.
10 ฮฉ
B.
24 ฮฉ
C.
2.4 ฮฉ
D.
12 ฮฉ
Show Answer & Explanation
Correct Answer: A
In a series circuit, the total resistance is simply the sum of the individual resistances. Here, R_total = R1 + R2 = 4 ฮฉ + 6 ฮฉ = 10 ฮฉ.
Q9
Hard
A capacitor of capacitance 5 ยตF is charged to a voltage of 12 V. What is the energy stored in the capacitor?
A.
0.36 mJ
B.
0.72 mJ
C.
1.20 mJ
D.
2.40 mJ
Show Answer & Explanation
Correct Answer: A
The energy (E) stored in a capacitor is calculated using the formula E = 0.5 * C * V^2. Here, E = 0.5 * 5 x 10^-6 F * (12 V)^2 = 0.36 mJ.
Q10
Hard
In a parallel circuit with three resistors of 6ฮฉ, 12ฮฉ, and 18ฮฉ, what is the equivalent resistance of the circuit?
A.
3ฮฉ
B.
4ฮฉ
C.
5ฮฉ
D.
6ฮฉ
Show Answer & Explanation
Correct Answer: B
For resistors in parallel, the formula is 1/R_eq = 1/R1 + 1/R2 + 1/R3. This gives 1/R_eq = 1/6 + 1/12 + 1/18. Calculating this, we find R_eq = 4ฮฉ, which is the equivalent resistance of the circuit.
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Electricity โ SPM (Malaysia) SPM Physics Practice Questions Online
This page contains 126 practice MCQs for the chapter Electricity in SPM (Malaysia) SPM Physics. The questions are organized by difficulty โ 25 easy, 78 medium, 23 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.