POST UTME BABCOCK UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?
A. 50 Bq
B. 25 Bq
C. 12.5 Bq
D. 6.25 Bq
Question 2
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 3
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 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 magnetic field is produced by a current-carrying wire. If the current is 2 A and the length of the wire is 10 cm, what is the magnitude of the magnetic field at a dis\tance of 5 cm from the wire?
A. 0.1 T
B. 0.2 T
C. 0.3 T
D. 0.4 T
Question 6
A lens has a focal length of 20 cm. If an object is placed 30 cm from the lens, what is the magnification of the image formed?
A. 1
B. 2
C. 3
D. 4
Question 7
A 100 W light bulb is connected to a 120 V power source. If the bulb is turned on for 2 hours, calculate the total energy consumed by the bulb.
A. 2.4 kWh
B. 4.8 kWh
C. 6.0 kWh
D. 8.0 kWh
Question 8
A sound wave has a frequency of 200 Hz and a speed of 340 m/s. What is the wavelength of the sound wave?
A. 0.5 m
B. 1 m
C. 1.5 m
D. 2 m
Question 9
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. If the air resis\tance is negligible, what is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 10
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 11
A wire of resis\tance 5 Ω is connected in parallel with a wire of resis\tance 10 Ω. If a voltage of 15 V is applied across the circuit, what is the total current flowing through the circuit?
A. 3 A
B. 4 A
C. 5 A
D. 6 A
Question 12
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 13
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 14
A particle of mass 0.5 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, calculate the maximum speed of the particle.
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 15
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

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: