POST UTME AAUA 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 angular velocity of the particle?
A. 2 rad/s
B. 4 rad/s
C. 6 rad/s
D. 8 rad/s
Question 2
A heat engine operates between two temperatures of 500 K and 300 K. If the engine has an efficiency of 30%, what is the temperature of the hot reservoir?
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 3
A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. What is the speed of the sound wave?
A. 100 m/s
B. 200 m/s
C. 300 m/s
D. 400 m/s
Question 4
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 force of 9 N, what is the angular velocity of the particle?
A. 1.5 rad/s
B. 3 rad/s
C. 4.5 rad/s
D. 6 rad/s
Question 5
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial pressure is 1.2 atm, what is the final pressure?
A. 1.5 atm
B. 2.0 atm
C. 2.5 atm
D. 3.0 atm
Question 6
A wave with a frequency of 50 Hz and a wavelength of 0.5 m is traveling through a medium. If the wave has a speed of 20 m/s, determine the amplitude of the wave.
A. 0.01 m
B. 0.1 m
C. 0.5 m
D. 1.0 m
Question 7
A radioactive sample has a half-life of 10 years. If the initial activity is 100Bq, what is the activity after 20 years?
A. 12.5Bq
B. 25Bq
C. 50Bq
D. 100Bq
Question 8
A uniform solid sphere of mass 2 kg and radius 0.1 m is partially submerged in a liquid of density 1000 kg/m^3. If the sphere is in equilibrium, what is the pressure at the bottom of the sphere?
A. 2000 Pa
B. 1000 Pa
C. 500 Pa
D. 2500 Pa
Question 9
A 2kg block is attached to a horizontal spring with a force cons\tant of 100N/m. If the block is displaced by 0.1m from its equilibrium position, what is the potential energy stored in the spring?
A. 1J
B. 2J
C. 5J
D. 10J
Question 10
A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across the plates, calculate the energy stored in the capacitor.
A. 0.1 J
B. 0.2 J
C. 0.4 J
D. 0.8 J
Question 11
A heat engine operates between two reservoirs at temperatures 500 K and 300 K. If the engine absorbs 200 J of heat from the high-temperature reservoir, what is the efficiency of the engine?
A. 0.25
B. 0.30
C. 0.35
D. 0.40
Question 12
A body of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. What is the magnitude of the centripetal acceleration?
A. v^2/r
B. v/r
C. r/v
D. v^2
Question 13
A magnetic field of 0.5 T is applied to a current-carrying wire. If the current in the wire is 2 A, what is the force experienced by the wire?
A. 0.5 N
B. 1 N
C. 2 N
D. 5 N
Question 14
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. What is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 15
A particle of mass 1 kg is moving in a circular path with a radius of 2 m. If the particle has a speed of 4 m/s, calculate the centripetal acceleration.
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2

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