POST UTME WELLSPRING UNIVERSITY 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A light ray 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 2
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. What is the magnitude of the net force acting on the particle?
A. 2 N
B. 4 N
C. 6 N
D. 8 N
Question 3
A 2.5 kg block of ice at 0°C is placed in a 10°C water bath. Assuming the specific heat capacity of ice is 2090 J/(kg°C) and the specific heat capacity of water is 4186 J/(kg°C), calculate the time it takes for the ice to melt completely.
A. 10 minutes
B. 20 minutes
C. 30 minutes
D. 40 minutes
Question 4
A 100.0 mL sample of a 0.50 M NaOH solution is mixed with a 100.0 mL sample of a 0.50 M HCl solution. What is the resulting pH of the solution?
A. 7.00
B. 7.50
C. 8.00
D. 9.00
Question 5
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. If the particle is subjected to a centripetal force $F_c = \frac{mv^2}{r}$, what is the work done by this force as the particle moves through an angle $\theta$?
A. \( W = \frac{1}{2}mv^2\( 1 - \cos\theta \ \) )
B. \( W = \frac{1}{2}mv^2\( 1 + \cos\theta \ \) )
C. \( W = mv^2\sin\theta \)
D. \( W = mv^2\cos\theta \)
Question 6
A magnetic field is produced by a current-carrying wire. If the current is 2 A and the length of the wire is 0.5 m, what is the magnitude of the magnetic field at a dis\tance of 0.2 m from the wire?
A. 0.01 T
B. 0.02 T
C. 0.03 T
D. 0.04 T
Question 7
A wave is described by the equation \( y = A\sin\( kx - omega t \ \) ). If the wave is traveling in the positive $x$-direction, what is the direction of the group velocity?
A. The group velocity is in the positive $x$-direction
B. The group velocity is in the negative $x$-direction
C. The group velocity is in the positive $y$-direction
D. The group velocity is in the negative $y$-direction
Question 8
A particle of mass $m$ is moving in a simple harmonic motion with a frequency $f$. If the particle is displaced by a dis\tance $x$ from its equilibrium position, what is the potential energy of the particle?
A. \( U = \frac{1}{2}momega^2x^2 \)
B. \( U = \frac{1}{2}momega^2x \)
C. \( U = momega^2x \)
D. \( U = \frac{1}{2}momega^2 \)
Question 9
A parallel plate capacitor has plates of area 0.04 m^2 and separation 2 mm. If the capaci\tance is 2.5 nF, what is the value of the dielectric cons\tant?
A. 1.6
B. 2.5
C. 3.2
D. 4.0
Question 10
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. Calculate the magnitude of the force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 11
A convex lens of focal length 20 cm forms an image of an object at a dis\tance of 30 cm. What is the magnification of the lens?
A. -1
B. -0.5
C. 0.5
D. 1
Question 12
A projectile is launched from the origin with an initial velocity $v_0$ at an angle $\theta$ above the horizontal. Assuming the only force acting on the projectile is gravity, what is the time of flight of the projectile?
A. \frac{2v_0 \sin \theta}{g}
B. \frac{v_0 \sin \theta}{g}
C. \frac{v_0 \cos \theta}{g}
D. \frac{2v_0 \cos \theta}{g}
Question 13
A gas is contained in a cylinder of volume $V$ with a movable piston. The gas is heated, cau\sing its temperature to increase by $\Delta T$. Assuming the gas is ideal and the piston is frictionless, what is the change in pressure of the gas?
A. \frac{nR\Delta T}{V}
B. \frac{n\Delta T}{V}
C. \frac{R\Delta T}{V}
D. \frac{nRT}{V}
Question 14
A capacitor is charged to a potential difference of 12 V. If the capaci\tance is 2.5 μF, what is the energy stored in the capacitor?
A. 0.03 J
B. 0.06 J
C. 0.09 J
D. 0.12 J
Question 15
A 2.0 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.20 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, calculate the maximum speed of the block as it passes through its equilibrium position.
A. 0.50 m/s
B. 1.00 m/s
C. 1.41 m/s
D. 2.00 m/s

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