POST UTME UNILAG 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A photon of energy 2.5 eV is incident on a metal surface with work function 1.8 eV. Determine the maximum kinetic energy of the photoelectron.
A. 0.1 eV
B. 0.2 eV
C. 0.3 eV
D. 0.4 eV
Question 2
A 5 μF capacitor is connected in series with a 10 kΩ resistor and a 20 V battery. What is the time cons\tant of the circuit?
A. 0.1 s
B. 0.2 s
C. 0.5 s
D. 1 s
Question 3
A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 100 Bq, what is the activity of the sample after 20 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 4
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. What is the magnitude of the centripetal force acting on the particle?
A. 8.0 N
B. 12.0 N
C. 16.0 N
D. 20.0 N
Question 5
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 6
A wave function is given by \psi(x) = Ae^{ikx}. If the wave function is normalized, what is the value of A?
A. 1
B. \sqrt{\frac{1}{2\pi}}
C. \sqrt{\frac{1}{\pi}}
D. \sqrt{\frac{2}{\pi}}
Question 7
A block of mass 5.0 kg is attached to a horizontal spring with a force cons\tant of 200 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 8
A uniform magnetic field of 2 T is applied to a coil of wire with 100 turns. If the coil has an area of 0.1 m^2, what is the magnitude of the magnetic flux through the coil?
A. 0.2 Wb
B. 0.4 Wb
C. 0.6 Wb
D. 0.8 Wb
Question 9
A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. What is the magnitude of the centripetal force acting on the particle?
A. 8 N
B. 12 N
C. 16 N
D. 20 N
Question 10
A 2 kg block is attached to a horizontal spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.1 m from its equilibrium position, what is the magnitude of the force exerted by the spring on the block?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 11
A uniform magnetic field of strength 2.0 T is directed along the z-axis. A current of 5.0 A flows through a straight wire of length 0.5 m, placed along the x-axis. What is the magnitude of the magnetic force experienced by the wire?
A. 0.25 N
B. 0.5 N
C. 1.0 N
D. 1.5 N
Question 12
A particle of charge 5 C is moving with a velocity of 2 m/s in a magnetic field of strength 1 T. If the particle is subjected to a force of 10 N, what is the direction of the magnetic field?
A. Clockwise
B. Counterclockwise
C. Into the page
D. Out of the page
Question 13
A wave of wavelength 0.5 m and frequency 10 Hz is propagating in a medium with speed 20 m/s. Determine the amplitude of the wave.
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 14
A ray of light passes through a prism and is re\fracted. If the angle of incidence is 30° and the angle of re\fraction is 20°, what is the angle of deviation?
A. 10°
B. 20°
C. 30°
D. 40°
Question 15
A parallel-plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 12 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?
A. 20 μF
B. 15 μF
C. 10 μF
D. 5 μF

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