POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A charged particle moves through a uniform magnetic field. If the particle's velocity is 5 m/s, the magnetic field strength is 0.5 T, and the charge of the particle is 2 x 10^-19 C, what is the force exerted on the particle?
A. 1 x 10^-15 N
B. 5 x 10^-15 N
C. 1 x 10^-14 N
D. 5 x 10^-14 N
Question 2
A block of mass 5 kg is attached to a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, determine the maximum velocity of the block.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 3
A particle of mass 0.5 kg is moving in a circular path of radius 2 m with a cons\tant speed of 4 m/s. If the particle is subject to a centripetal force of 10 N, determine the angle between the force and the radius vector.
A. 30°
B. 45°
C. 60°
D. 75°
Question 4
A capacitor of capaci\tance 10 μF is connected in parallel with a resistor of resis\tance 20 Ω. If a voltage of 30 V is applied across the circuit, what is the current flowing through the circuit?
A. 1.5 A
B. 2.5 A
C. 3.5 A
D. 4.5 A
Question 5
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the circuit?
A. 1.5 A
B. 2 A
C. 3 A
D. 4 A
Question 6
A radioactive sample of Uranium-238 undergoes \alpha decay, emitting an \alpha particle. If the initial mass of the sample is 200 g, and the mass of the \alpha particle is 4 u, what is the mass of the daughter nucleus after the decay?
A. 196 g
B. 198 g
C. 200 g
D. 202 g
Question 7
A coil of wire of radius 0.05 m is placed in a magnetic field of strength 0.2 T. If the coil has 100 turns and a resis\tance of 10 Ω, what is the induced emf in the coil when the magnetic flux through it changes at a rate of 0.1 Wb/s?
A. -10 V
B. -20 V
C. -30 V
D. -40 V
Question 8
A gas is contained in a cylinder of volume $V$ and is heated from temperature $T_1$ to $T_2$. If the gas is ideal and the process is isothermal, what is the change in the internal energy of the gas?
A. \Delta U = 0
B. \Delta U = nC_V\( T_2 - T_1 \)
C. \Delta U = nC_P\( T_2 - T_1 \)
D. \Delta U = nR\( T_2 - T_1 \)
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 subjected to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 6 m/s^2
B. 12 m/s^2
C. 18 m/s^2
D. 24 m/s^2
Question 10
A spring with a spring cons\tant of 100 N/m is stretched by 2 meters. What is the potential energy stored in the spring?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 11
A wire of length $L$ and cross-sectional area $A$ is stretched by a force $F$. If the Young's modulus of the wire is $Y$, what is the strain in the wire?
A. \frac{FL}{AY}
B. \frac{FA}{LY}
C. \frac{FL}{2AY}
D. \frac{FA}{2LY}
Question 12
A block of mass 10 kg is placed on a frictionless surface. A horizontal force of 20 N is applied to the block, cau\sing it to accelerate. What is the acceleration of the block?
A. 0.5 m/s^2
B. 1 m/s^2
C. 2 m/s^2
D. 5 m/s^2
Question 13
A 12 V battery is connected in series with a 4 Ω resistor and a 6 Ω resistor. If the current through the circuit is 2 A, determine the voltage across the 6 Ω resistor.
A. 8 V
B. 12 V
C. 16 V
D. 20 V
Question 14
A gas at a pressure of 2 atm and a temperature of 300 K is allowed to expand to a volume of 10 m^3. If the gas is ideal, determine the final pressure of the gas.
A. 1 atm
B. 1.5 atm
C. 2 atm
D. 2.5 atm
Question 15
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. 400 m/s
D. 800 m/s

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