Electricity and Magnetism Practice Questions
Matric (South Africa) · Matric Physical Sciences · 134 free MCQs with instant results and detailed explanations.
134
Total
32
Easy
83
Medium
19
Hard
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Sample Questions from Electricity and Magnetism
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Q1
Easy
What component is used to store electrical energy in an electric circuit?
A.
Resistor
B.
Capacitor
C.
Inductor
D.
Transistor
Show Answer & Explanation
Correct Answer: B
A capacitor stores electrical energy in an electric field, making it essential for various applications in circuits, unlike resistors which dissipate energy.
Q2
Easy
In a circuit with a 12V battery and a resistor of 4 ohms, what is the current flowing through the circuit?
A.
3 A
B.
12 A
C.
48 A
D.
2 A
Show Answer & Explanation
Correct Answer: A
Using Ohm's Law (V = IR), where V is voltage, I is current, and R is resistance, we calculate I = V/R = 12V/4ฮฉ = 3A.
Q3
Easy
What is the unit of electric current?
A.
Coulomb
B.
Ohm
C.
Ampere
D.
Volt
Show Answer & Explanation
Correct Answer: C
The unit of electric current is the Ampere (A), which measures the flow of electric charge per unit time.
Q4
Medium
What is the direction of the magnetic field around a straight conductor carrying current when viewed from one end?
A.
Clockwise
B.
Counterclockwise
C.
North to South
D.
South to North
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Correct Answer: B
Using the right-hand rule, if the thumb points in the direction of the current, the fingers curl in the direction of the magnetic field. Thus, it forms a counterclockwise direction when viewed from the current's entry point.
Q5
Medium
Two resistors of 6 ohms and 12 ohms are connected in series. What is the total resistance in the circuit?
A.
6 ohms
B.
18 ohms
C.
8 ohms
D.
12 ohms
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Correct Answer: B
In a series circuit, the total resistance is the sum of individual resistances. Therefore, R_total = R1 + R2 = 6ฮฉ + 12ฮฉ = 18ฮฉ.
Q6
Medium
If the electric field strength is 5 N/C and the distance from the source charge is 10 m, what is the potential difference at that point?
A.
50 V
B.
5 V
C.
500 V
D.
0.5 V
Show Answer & Explanation
Correct Answer: A
The potential difference (V) is calculated by the formula V = E * d, where E is the electric field strength and d is the distance. Here, V = 5 N/C * 10 m = 50 V.
Q7
Medium
What happens to the resistance of a wire if its length is doubled while keeping its material and cross-sectional area constant?
A.
It remains the same
B.
It doubles
C.
It halves
D.
It quadruples
Show Answer & Explanation
Correct Answer: B
Resistance (R) is directly proportional to the length (L) of the wire. Thus, if the length is doubled, the resistance also doubles, assuming the material and area remain constant.
Q8
Hard
A magnet is moved towards a stationary coil of wire. What phenomenon occurs in the coil as a result of the changing magnetic field?
A.
Pumping effect
B.
Electromagnetic induction
C.
Magnetic flux leakage
D.
Magnetostatic equilibrium
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Correct Answer: B
As the magnet approaches the coil, the changing magnetic field induces an electromotive force (EMF) in the coil, leading to electromagnetic induction.
Q9
Hard
A circuit consists of a 12 V battery, a resistor of 4 ฮฉ, and a capacitor of 10 ยตF connected in series. What is the time constant of the circuit?
A.
40 ms
B.
4 ms
C.
10 ms
D.
12 ms
Show Answer & Explanation
Correct Answer: A
The time constant (ฯ) for an RC circuit is given by ฯ = R ร C. Here, R = 4 ฮฉ and C = 10 ยตF (10 ร 10^-6 F). Thus, ฯ = 4 ร (10 ร 10^-6) = 40 ร 10^-6 seconds, which is 40 ms.
Q10
Hard
A copper wire of length 100 m and cross-sectional area 1 mmยฒ is used to connect a battery. If the resistivity of copper is 1.68 x 10^-8 ฮฉยทm, what is the resistance of the wire?
A.
0.168 ฮฉ
B.
1.68 ฮฉ
C.
10.68 ฮฉ
D.
0.0168 ฮฉ
Show Answer & Explanation
Correct Answer: A
The resistance (R) can be calculated using the formula R = ฯ * (L/A), where ฯ is the resistivity, L is the length, and A is the cross-sectional area. Substituting the values gives R = (1.68 x 10^-8) * (100 / (1 x 10^-6)) = 0.168 ฮฉ.
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Electricity and Magnetism โ Matric (South Africa) Matric Physical Sciences Practice Questions Online
This page contains 134 practice MCQs for the chapter Electricity and Magnetism in Matric (South Africa) Matric Physical Sciences. The questions are organized by difficulty โ 32 easy, 83 medium, 19 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.