POST UTME REDEEMERS UNIVERSITY 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A heat engine operates between two temperatures of 500 K and 300 K. If the efficiency of the engine is 30%, calculate the work done by the engine in 10 minutes.
A. 1500 J
B. 3000 J
C. 4500 J
D. 6000 J
Question 2
A particle is moving in a circular path with a radius of 2 m. If the particle completes one revolution in 10 seconds, calculate the angular velocity of the particle.
A. 0.62 rad/s
B. 1.24 rad/s
C. 2.48 rad/s
D. 3.14 rad/s
Question 3
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. What is the equivalent resis\tance of the circuit?
A. 35 Ω
B. 40 Ω
C. 45 Ω
D. 50 Ω
Question 4
A block of metal is heated from 20°C to 80°C. What is the change in entropy of the block?
A. 0.1 J/K
B. 0.2 J/K
C. 0.3 J/K
D. 0.4 J/K
Question 5
A particle of mass 2 kg is moving in a circular path of radius 3 m with a cons\tant speed of 4 m/s. If the particle is subjected to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 6
A body of mass 10 kg is moving with a velocity of 5 m/s. If the body is subjected to a force of 20 N, calculate the acceleration (a) of the body.
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 7
A container of volume $V$ is filled with an ideal gas at temperature $T$. The gas is then compressed to a volume $V/2$ while keeping the temperature cons\tant. What is the change in internal energy of the gas?
A. $Delta U = 0$
B. $Delta U = nC_VDelta T$
C. $Delta U = nC_Vlnleft\( \frac{V}{V/2}\right \)$
D. $Delta U = nC_Vlnleft\( \frac{V/2}{V}\right \)$
Question 8
A capacitor of capaci\tance 10 μF is connected in series with a resistor of resis\tance 50 Ω. If the circuit is driven by a 100 Hz AC voltage source of maximum voltage 200 V, calculate the impedance of the circuit.
A. 53.04 Ω
B. 66.67 Ω
C. 80.30 Ω
D. 94.94 Ω
Question 9
A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. If the particle is subject to a centripetal force of 10 N, calculate the angular velocity of the particle.
A. 0.53 rad/s
B. 1.06 rad/s
C. 1.59 rad/s
D. 2.12 rad/s
Question 10
A gas is compressed from an initial volume of 2 L to a final volume of 1 L at a cons\tant temperature of 300 K. What is the work done on the gas?
A. 200 J
B. 400 J
C. 600 J
D. 800 J
Question 11
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If the projectile lands 10 seconds later, calculate the maximum height reached by the projectile.
A. 4.9 m
B. 9.8 m
C. 14.7 m
D. 19.6 m
Question 12
A current of 5 A flows through a resistor of 10 Ω for 2 seconds. What is the energy dissipated in the resistor?
A. 50 J
B. 100 J
C. 150 J
D. 200 J
Question 13
A magnetic field is produced by a current-carrying wire. If the current is 5 A and the length of the wire is 2 m, calculate the magnetic field strength (B) at a dis\tance of 1 m from the wire.
A. 0.1 T
B. 0.2 T
C. 0.3 T
D. 0.4 T
Question 14
A car travels from point A to point B with an average speed of 40 km/h. If the dis\tance between points A and B is 80 km, what is the time taken for the journey?
A. 2 h
B. 2.5 h
C. 3 h
D. 3.5 h
Question 15
A simple harmonic motion has a maximum displacement of 0.2 m and a period of 2 s. What is the angular frequency of the motion?
A. 1.57 rad/s
B. 3.14 rad/s
C. 4.71 rad/s
D. 6.28 rad/s

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