POST UTME BABCOCK UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length -5 cm. What is the focal length of the combination?
A. 5 cm
B. 10 cm
C. 15 cm
D. 20 cm
Question 2
A \tank contains 100 L of water at a temperature of 20°C. If 10 kg of ice at 0°C is added to the \tank, what is the final temperature of the water?
A. 0°C
B. 5°C
C. 10°C
D. 15°C
Question 3
A gas expands from an initial volume of 2 L to a final volume of 5 L against an external pressure of 2 atm. If the gas is ideal and the process is isothermal, what is the work done by the gas?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 4
A capacitor of capaci\tance 5 μF is connected in series with a resistor of resis\tance 10 Ω. If a voltage of 20 V is applied across the circuit, what is the current flowing through the circuit?
A. 2 mA
B. 4 mA
C. 6 mA
D. 8 mA
Question 5
A particle of mass 2.0 kg is moving in a circular path of radius 3.0 m with a cons\tant speed of 4.0 m/s. If the particle is subject to a centripetal force of 10.0 N, what is the magnitude of the acceleration of the particle?
A. 12.0 m/s^2
B. 8.0 m/s^2
C. 6.0 m/s^2
D. 4.0 m/s^2
Question 6
A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across it, what is the energy stored in the capacitor?
A. 0.2 J
B. 0.4 J
C. 0.6 J
D. 0.8 J
Question 7
A gas is confined to a cylinder of volume 0.02 m^3. If the gas is heated, cau\sing its temperature to increase by 10 K, what is the magnitude of the change in pressure?
A. 50 Pa
B. 100 Pa
C. 150 Pa
D. 200 Pa
Question 8
A wave with a frequency of 50 Hz and a wavelength of 2.0 m is traveling through a medium. If the wave is reflected off a wall, calculate the frequency of the reflected wave.
A. 25 Hz
B. 50 Hz
C. 75 Hz
D. 100 Hz
Question 9
A capacitor consists of two parallel plates, each of area 0.02 m^2, separated by a dis\tance of 0.005 m. If the capaci\tance of the capacitor is 100 nF, what is the magnitude of the electric field between the plates?
A. 2000 V/m
B. 1000 V/m
C. 500 V/m
D. 250 V/m
Question 10
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 force?
A. 8 N
B. 12 N
C. 16 N
D. 24 N
Question 11
A radioactive sample has an initial activity of 100 Bq. If the half-life of the sample is 10 minutes, what is the activity after 20 minutes?
A. 25 Bq
B. 50 Bq
C. 75 Bq
D. 100 Bq
Question 12
A circuit consists of a 12 V battery, a 4 ohm resistor, and a 6 ohm resistor connected in series. What is the total resis\tance of the circuit?
A. 10 ohms
B. 12 ohms
C. 14 ohms
D. 16 ohms
Question 13
A coil of wire consists of 50 turns, each with an area of 0.005 m^2. If the coil is placed in a magnetic field of magnitude 0.2 T, what is the magnitude of the induced emf?
A. 0.5 V
B. 1.0 V
C. 1.5 V
D. 2.0 V
Question 14
A particle of mass 1.0 kg is moving in a circular path of radius 2.0 m with a cons\tant speed of 3.0 m/s. If the particle is subject to a centripetal force of 5.0 N, what is the magnitude of the acceleration of the particle?
A. 10.0 m/s^2
B. 8.0 m/s^2
C. 6.0 m/s^2
D. 4.0 m/s^2
Question 15
A 2.0 μF capacitor is connected in series with a 3.0 kΩ resistor and a 9.0 V battery. If the switch is closed at t = 0, calculate the charge on the capacitor after 5.0 ms.
A. 0.018 C
B. 0.036 C
C. 0.054 C
D. 0.072 C

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