POST UTME BABCOCK UNIVERSITY 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A circuit consists of a 12 Ω resistor, a 20 Ω resistor, and a 30 Ω resistor connected in series. What is the total resis\tance of the circuit?
A. ( 62 ) Ω
B. ( 72 ) Ω
C. ( 82 ) Ω
D. ( 92 ) Ω
Question 2
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 subject to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 12 m/s^2
B. 16 m/s^2
C. 20 m/s^2
D. 24 m/s^2
Question 3
A magnetic field of 0.5 T is applied to a coil of 100 turns and a radius of 0.1 m. If the coil is rotated by 90 degrees, what is the induced emf?
A. 0.5 V
B. 1 V
C. 2 V
D. 5 V
Question 4
A block of mass 5 kg is placed on a frictionless surface and subjected to a horizontal force of 10 N. If the block is initially at rest, what is the acceleration of the block?
A. 2 m/s^2
B. 3 m/s^2
C. 4 m/s^2
D. 5 m/s^2
Question 5
A heat engine operates between a temperature of 500 K and a temperature of 300 K. If the efficiency of the engine is 30%, what is the work done by the engine?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 6
A ray of light passes through a prism and is re\fracted. If the angle of incidence is 30° and the angle of re\fraction is 40°, calculate the angle of deviation.
A. -10°
B. 10°
C. 20°
D. 30°
Question 7
A parallel plate capacitor has a capaci\tance of 2 μF and is charged to a potential difference of 10 V. If a dielectric slab of thickness 2 mm and dielectric cons\tant 3 is inserted between the plates, what is the new capaci\tance?
A. 4 μF
B. 6 μF
C. 8 μF
D. 10 μF
Question 8
A block of mass 5 kg is placed on a frictionless surface and attached to a horizontal spring with a force cons\tant of 200 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 9
A parallel plate capacitor has plates of area 0.04 m^2 and separation 2 mm. The capaci\tance is 1.6 nF. If a potential difference of 10 V is applied across the plates, calculate the charge stored on the capacitor.
A. 1.6 x 10^-8 C
B. 1.6 x 10^-7 C
C. 1.6 x 10^-9 C
D. 1.6 x 10^-6 C
Question 10
A parallel plate capacitor consists of two plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the capaci\tance of the capacitor is 10^-6 F, what is the charge on the plates when a potential difference of 10 V is applied across them?
A. 10^-5 C
B. 10^-4 C
C. 10^-3 C
D. 10^-2 C
Question 11
A thermodynamic system undergoes a process from state A to state B. The initial temperature is 300 K and the final temperature is 400 K. If the change in entropy is 50 J/K, calculate the heat absorbed by the system.
A. 20000 J
B. 25000 J
C. 30000 J
D. 35000 J
Question 12
A quantum particle has a wave function given by ψ(x) = Ae^\( -αx^2 \). What is the probability of finding the particle between x = 0 and x = 1?
A. 0.5
B. 0.6
C. 0.7
D. 0.8
Question 13
A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. If the particle is subjected to a centripetal acceleration of 1 m/s^2, what is the magnitude of the force acting on the particle?
A. 5 N
B. 6 N
C. 7 N
D. 8 N
Question 14
A 100 μF capacitor is charged to a potential difference of 10 V. What is the charge on the capacitor?
A. ( 1.0 ) C
B. ( 2.0 ) C
C. ( 3.0 ) C
D. ( 4.0 ) C
Question 15
A parallel plate capacitor has a capaci\tance of 5 μF and is charged to a potential difference of 20 V. If a dielectric slab of thickness 4 mm and dielectric cons\tant 5 is inserted between the plates, what is the new capaci\tance?
A. 10 μF
B. 15 μF
C. 20 μF
D. 25 μF

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