POST UTME UNN 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a nuclear reactor, the fission of ΔU-235 releases 200 MeV of energy per reaction. If 1 MeV is equivalent to 1.602 × 10⁻⁹ J, calculate the total energy released per reaction in joules.
A. 3.204 × 10⁻⁹ J
B. 3.204 × 10⁸ J
C. 3.204 × 10⁺ J
D. 3.204 × 10⁻ J
Question 2
A sound wave with a frequency of 200 Hz is emitted from a source moving towards a stationary observer. If the speed of sound in air is 343 m/s, what is the apparent frequency heard by the observer?
A. 220 Hz
B. 200 Hz
C. 180 Hz
D. 160 Hz
Question 3
A 5 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position and released from rest, calculate the maximum speed of the block.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 4
A wave has a frequency of 200 Hz and a wavelength of 0.5 m. What is the speed of the wave?
A. 100 m/s
B. 200 m/s
C. 300 m/s
D. 400 m/s
Question 5
A 2 kg object is moving in a circular path with a radius of 3 m. If the object has a speed of 4 m/s, calculate the centripetal acceleration.
A. 2 m/s⁻⁹
B. 4 m/s⁻⁹
C. 6 m/s⁻⁹
D. 8 m/s⁻⁹
Question 6
A gas at 300 K expands from 1.00 L to 2.00 L against a cons\tant external pressure of 1.00 atm. Calculate the work done by the gas.
A. -1.00 J
B. -0.500 J
C. +1.00 J
D. +0.500 J
Question 7
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle is moving at a speed of 4 m/s, what is the magnitude of the centripetal force acting on the particle?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 8
A circuit consists of a 10 Ω resistor and a 20 Ω resistor connected in series. A voltage of 20 V is applied across the circuit. Determine the current flowing through the circuit.
A. 0.5 A
B. 1.0 A
C. 1.5 A
D. 2.0 A
Question 9
A magnetic field is produced by a current-carrying wire. If the current is increased by a factor of 2, what happens to the magnetic field?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Remains the same
D. Decreases by a factor of 2
Question 10
A 5 kg block is moving with a velocity of 2 m/s on a frictionless surface. What is the kinetic energy of the block?
A. 10 J
B. 20 J
C. 30 J
D. 40 J
Question 11
A car is traveling at a speed of 30 m/s when it encounters a curve with a radius of 50 m. If the car is subject to a centripetal force of 500 N, what is the magnitude of the acceleration of the car?
A. 10 m/s^2
B. 20 m/s^2
C. 30 m/s^2
D. 40 m/s^2
Question 12
A charged particle of mass 1 kg and charge 2 C is moving in a magnetic field of strength 5 T. If the particle is moving at a speed of 3 m/s, what is the magnitude of the force acting on the particle?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 13
A wave has a frequency of 100 Hz and a wavelength of 0.2 m. What is the speed of the wave?
A. 20 m/s
B. 40 m/s
C. 60 m/s
D. 80 m/s
Question 14
A capacitor consists of two parallel plates separated by a dis\tance of 2 mm. If the capaci\tance of the capacitor is 10 μF, what is the charge stored on the capacitor when a potential difference of 5 V is applied across it?
A. 50 μC
B. 60 μC
C. 70 μC
D. 80 μC
Question 15
A 20 Ω resistor is connected in series with a 10 Ω resistor and a 5 Ω resistor. If a 12 V battery is connected across the circuit, what is the current flowing through the 20 Ω resistor?
A. 0.3 A
B. 0.4 A
C. 0.5 A
D. 0.6 A

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