POST UTME BABCOCK UNIVERSITY 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a voltage of 12 V is applied across the circuit, what is the current flowing through the 10 Ω resistor?
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 2
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 3
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 4
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 10 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 5
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
Question 6
A thermodynamic system undergoes a process in which its internal energy remains cons\tant. If the system absorbs 200 J of heat energy and does 100 J of work, what is the change in its entropy?
A. 0.5 J/K
B. 1 J/K
C. 2 J/K
D. 5 J/K
Question 7
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 8
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. What is the energy stored in the capacitor?
A. \( 2.0 \times 10^{-3} \) J
B. \( 4.0 \times 10^{-3} \) J
C. \( 6.0 \times 10^{-3} \) J
D. \( 8.0 \times 10^{-3} \) J
Question 9
A gas is compressed from an initial volume of 2 m^3 to a final volume of 1 m^3. If the initial pressure is 100 kPa and the final pressure is 200 kPa, calculate the work done on the gas.
A. -17321.19 J
B. -17321.19 kJ
C. -17321.19 mJ
D. -17321.19 J
Question 10
A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 5 m/s. If the particle is subjected to a centripetal force of 15 N, what is the magnitude of the acceleration of the particle?
A. 10 m/s^2
B. 15 m/s^2
C. 20 m/s^2
D. 25 m/s^2
Question 11
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 at a dis\tance of 0.5 m from the wire.
A. 2 x 10^-5 T
B. 2 x 10^-4 T
C. 2 x 10^-3 T
D. 2 x 10^-2 T
Question 12
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 13
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 air resis\tance is negligible, what is the maximum height reached by the projectile?
A. 10 m
B. 20 m
C. 30 m
D. 40 m
Question 14
A circuit consists of a 12 Ω resistor, a 20 Ω resistor, and a 10 Ω resistor connected in series. If a voltage of 24 V is applied across the circuit, what is the current flowing through the circuit?
A. 0.5 A
B. 1 A
C. 2 A
D. 4 A
Question 15
A sound wave with a frequency of 200 Hz is traveling through a medium with a speed of 340 m/s. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2.0 m

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: