Free Physics Examination Questions and Answers for SS3

These Physics question and answers were pulled from our book ( Physics questions for SS3); Compiled to serve as a reference material to help teachers draw up test and exam questions faster. It could also help students assess their level of exam preparation. Each sample question includes correct answers.
[su_note note_color=”#fcf2e0″]Note that Questions are based on the NERDC curriculum (UBE compliant)[/su_note]

Sample Physics Exam Questions and Answers

ALTERNATING CURRENT
1. The peak voltage in an r.m.s. circuit is 2.0V and the resistance of the circuit is 3.0Ω. Find the peak current flowing.
A. 0.666A.
B. 1.5A.
C. 2.43A.
D. 1.333A
[su_accordion][su_spoiler title=”See the Answer” open=”no” style=”default” icon=”plus” anchor=”” class=””]The correct answer is A

Explanation: Io = Vo/R.[/su_spoiler]

2. In the circuit transistor diagram shown, the terminals P, Q and R represent __________.

A. BASE, EMITTER, COLLECTOR
B. BASE, COLLECTOR, EMITTER
C. EMITTER, BASE, COLLECTOR
D. COLLECTOR, EMITTER, BASE

[su_accordion][su_spoiler title=”See the Answer” open=”no” style=”default” icon=”plus” anchor=”” class=””]The correct answer is C.[/su_spoiler]

3. The resistance in a series R-C circuit is 5W. If the impedance of the circuit is 13 Ω, calculate the
reactance of the capacitor.
A. 18Ω
B. 16 Ω
C. 14 Ω
D. 12 Ω

[su_accordion][su_spoiler title=”See the Answer” open=”no” style=”default” icon=”plus” anchor=”” class=””]The correct answer is D

Explanation:.[/su_spoiler]

4. An RLC circuit with R = 60Ω, L = 0.2H, C = 40mF and f = 392.86Hz experiences the passage of an a.c. with peak value 0.1A. Obtain the value of the current vector, VC.
A. 10.0V.
B. 15.0V.
C. 18.4V.
D. 12.0V.

[su_accordion][su_spoiler title=”See the Answer” open=”no” style=”default” icon=”plus” anchor=”” class=””]The correct answer is A

Explanation:VC = Io × XC = 0.1 × 100 = 10.0V.[/su_spoiler]

5. Which of the following diagram represents correctly an n-p-n transistor?
A.
B.
C.
D.

[su_accordion][su_spoiler title=”See the Answer” open=”no” style=”default” icon=”plus” anchor=”” class=””]The correct answer is B [/su_spoiler]

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ELECTRIC FIELDS
1. Two plates capacitors are separated by a distance of 0.5m in a field at 107N/C.
[Take 1⁄4πeo = 9.05 × 109m/f].
Determine the power generated by the circuit.
A. 1.25 x 106W.
B. 26.73 x 104W.
C. 39.22 x 107W.
D. 1.38 x 108W

[su_accordion][su_spoiler title=”See the Answer” open=”no” style=”default” icon=”plus” anchor=”” class=””]The correct answer is D

Explanation:Power, P = IV.[/su_spoiler]

2. Two plates capacitors are separated by a distance of 0.5m in a field at 107N/C.
[Take 1⁄4πeo = 9.05 × 109m/f].
What is the current that could be generated if the system of circuit is left over a period of 10-5sec?
A. 10-3A.
B. 2.5×10-2A.
C. 27.62A.
D. 3.52A.

[su_accordion][su_spoiler title=”See the Answer” open=”no” style=”default” icon=”plus” anchor=”” class=””]The correct answer is C

Explanation:Current, I = Charge, q/time taken.[/su_spoiler]

3. A current of 21A is passed through a 20m length of two conducting wire placed 125cm apart. Determine the force of attraction between the wires assuming the current is flowing in the direction.
[TAKE the force constant to be 2 x 10-7].
A. 1.33 x 10-5N
B. 4.5 x 10-5N
C. 7.1 x 10-4N
D. 6.4 x 10-4N

[su_accordion][su_spoiler title=”See the Answer” open=”no” style=”default” icon=”plus” anchor=”” class=””]The correct answer is D

Explanation:current A = 21A, L = 20m Length wire = 125cm = 1.25m
Let the required force = F
F = 2 x 10 -7 x I2
L/d = 2 x 10-7 x 20m x 212/1.25
[/su_spoiler]

4. Two plates capacitors are separated by a distance of 0.5m in a field at 107N/C.
[Take 1⁄4πeo = 9.05 × 109m/f].
Obtain the possible resistance that could be applied across the capacitors.
A. 320.056KΩ.
B. 22.056KΩ.
C. 520KΩ.
D. 362.056KΩ

[su_accordion][su_spoiler title=”See the Answer” open=”no” style=”default” icon=”plus” anchor=”” class=””]The correct answer is D

Explanation:Resistance, R = V/I.[/su_spoiler]

5. In the given circuit shown, the cell P has an e.m.f of 1.5V and an unknown internal resistance, r while the cell Q has an e.m.f. 2.0V and an internal resistance 1. If the ammeter reads 50mA, then R equals _______.

A. 3.0W
B. 4.0W
C. 5.5W
D. 2.0W

[su_accordion][su_spoiler title=”See the Answer” open=”no” style=”default” icon=”plus” anchor=”” class=””]The correct answer is D

Explanation:[/su_spoiler]

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