POST UTME DELSU 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A magnetic field is produced by a current-carrying wire. If the current is increased by a factor of 2, what happens to the magnetic field?
A. The magnetic field increases by a factor of 2
B. The magnetic field increases by a factor of 4
C. The magnetic field remains the same
D. The magnetic field decreases by a factor of 2
Question 2
A gas is heated from 20°C to 50°C. If the initial volume is 2 L, what is the final volume?
A. 2.5 L
B. 3 L
C. 3.5 L
D. 4 L
Question 3
A 5 μF capacitor is connected in series with a 10 kΩ resistor. If a voltage of 12 V is applied across the circuit, what is the time cons\tant of the circuit?
A. 0.2 s
B. 0.5 s
C. 1.0 s
D. 2.0 s
Question 4
A heat engine operates between the temperatures of 300 K and 400 K. If it has an efficiency of 30%, what is the work done by the engine?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 5
A solid cylindrical rod of radius 0.05 m and length 1.5 m is made of a material with Young's modulus of 2.0 x 10^11 Pa. If a force of 50 N is applied \tangentially to the rod, what is the angular displacement of the rod?
A. 0.01 rad
B. 0.02 rad
C. 0.03 rad
D. 0.04 rad
Question 6
A heat engine operates between two temperatures of 500 K and 300 K. If the engine absorbs 1000 J of heat from the high-temperature reservoir, what is the efficiency of the engine?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 7
A capacitor of capaci\tance 20 μF is connected in parallel with a resistor of resis\tance 15 Ω. If a voltage of 75 V is applied across the circuit, what is the current flowing through the resistor?
A. 2.5 A
B. 5 A
C. 10 A
D. 15 A
Question 8
A magnetic field of strength 0.5 T is applied to a current-carrying wire of length 2 m. If the wire carries a current of 5 A, what is the force exerted on the wire?
A. 2.5 N
B. 5 N
C. 10 N
D. 20 N
Question 9
A sound wave with a frequency of 200 Hz has a maximum displacement of 0.5 mm. What is the amplitude of the wave?
A. 0.5 mm
B. 0.5 mm
C. 0.5 mm
D. 0.5 mm
Question 10
A capacitor of capaci\tance 10 μF is connected in series with a resistor of resis\tance 20 Ω. If a voltage of 50 V is applied across the circuit, what is the current flowing through the circuit?
A. 0.25 A
B. 0.5 A
C. 1 A
D. 2 A
Question 11
A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. What is the magnitude of the centripetal force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 12
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. 8 m/s^2
B. 12 m/s^2
C. 16 m/s^2
D. 20 m/s^2
Question 13
A particle of mass 3 kg is moving in a circular path with a radius of 0.5 m. The particle has a velocity of 10 m/s. Assuming the particle is subject to a centripetal force, calculate the magnitude of the centripetal force.
A. \frac{mv^2}{r}
B. \frac{2mv^2}{r}
C. \frac{mv^2}{2r}
D. \frac{mv^2}{4r}
Question 14
A spring with a spring cons\tant of 100 N/m is stretched by 2 m. What is the potential energy stored in the spring?
A. 100 J
B. 200 J
C. 400 J
D. 600 J
Question 15
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. 8 m/s^2
B. 16 m/s^2
C. 32 m/s^2
D. 64 m/s^2

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