POST UTME CALEB UNIVERSITY 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A light wave with a frequency of 5 x 10^14 Hz and a wavelength of 600 nm is incident on a metal surface. If the work function of the metal is 2.5 eV, calculate the maximum kinetic energy of the photoelectrons.
A. 1.5 eV
B. 2.5 eV
C. 3.5 eV
D. 4.5 eV
Question 2
A sound wave with a frequency of 200 Hz has a wavelength of 1.5 m. What is the speed of the sound wave?
A. 300 m/s
B. 600 m/s
C. 1200 m/s
D. 2400 m/s
Question 3
A light source is placed 2 m away from a convex lens of focal length 0.5 m. If the object is moved 1 m closer to the lens, what is the new image dis\tance?
A. 1.5 m
B. 2.5 m
C. 3.5 m
D. 4.5 m
Question 4
A heat engine operates between two temperatures 300 K and 600 K. If the efficiency of the engine is 30%, what is the work done by the engine per cycle?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 5
A solid sphere of radius R is made of a material with Young's modulus Y. If a force F is applied \tangentially to the sphere's surface, the resulting displacement of the sphere's center is given by the equation \( Delta r = \frac{FR}{3pi Y} \). What is the percentage increase in the sphere's volume due to this displacement?
A. 1%
B. 3%
C. 5%
D. 10%
Question 6
A simple harmonic motion has a maximum displacement of 2 m and a period of 4 s. What is the angular frequency of the motion?
A. 0.5 rad/s
B. 1.0 rad/s
C. 1.5 rad/s
D. 2.0 rad/s
Question 7
A heat engine operates between a temperature of 500 K and a temperature of 300 K. If the engine has an efficiency of 30%, what is the maximum possible work output?
A. 100 J
B. 200 J
C. 400 J
D. 600 J
Question 8
A convex lens has a focal length of 20 cm. If an object is placed 30 cm in front of the lens, what is the image dis\tance?
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
Question 9
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 subject to a centripetal force of 10 N, calculate the time period of the particle.
A. 2 s
B. 3 s
C. 4 s
D. 5 s
Question 10
A 5 kg block is moving on a frictionless surface with a velocity of 2 m/s. If a force of 10 N is applied to the block, calculate the acceleration of the block.
A. 1 m/s^2
B. 2 m/s^2
C. 3 m/s^2
D. 4 m/s^2
Question 11
A 2.5 mH inductor is connected in series with a 10 Ω resistor and a 20 V AC source. If the frequency of the source is 50 Hz, calculate the impedance of the circuit.
A. 10 Ω
B. 20 Ω
C. 30 Ω
D. 40 Ω
Question 12
A 2 μF capacitor is connected in series with a 10 Ω resistor and a 20 V AC source. If the frequency of the source is 50 Hz, calculate the reac\tance of the capacitor.
A. 10 Ω
B. 20 Ω
C. 30 Ω
D. 40 Ω
Question 13
A magnetic field of 0.5 T is applied to a coil of 100 turns and a radius of 0.2 m. If the current flowing through the coil is 2 A, calculate the torque experienced by the coil.
A. 0.2 Nm
B. 0.3 Nm
C. 0.4 Nm
D. 0.5 Nm
Question 14
A vector has a magnitude of 5 units and makes an angle of 60° with the x-axis. If the vector is rotated by 30° clockwise, what is the new angle with the x-axis?
A. 30°
B. 45°
C. 60°
D. 75°
Question 15
A radioactive sample has a half-life of 5 years. If the initial activity of the sample is 100 Bq, calculate the activity of the sample after 10 years.
A. 20 Bq
B. 30 Bq
C. 40 Bq
D. 50 Bq

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