POST UTME BABCOCK UNIVERSITY 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle has a speed of 4 m/s, what is the magnitude of the centripetal acceleration?
A. 0.5 m/s^2
B. 1 m/s^2
C. 2 m/s^2
D. 4 m/s^2
Question 2
A ray of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 25°
C. 30°
D. 35°
Question 3
A particle of mass $m$ is moving in a circular orbit of radius $r$ with a cons\tant speed $v$. The particle is subject to a centripetal force $F_c = \frac{mv^2}{r}$. If the particle's speed is doubled, what is the new centripetal force required to maintain the circular orbit?
A. 4\frac{mv^2}{r}
B. \frac{2mv^2}{r}
C. \frac{mv^2}{2r}
D. \frac{mv^2}{4r}
Question 4
A light source is placed at a dis\tance $d$ from a convex lens of focal length $f$. If the light source is moved to a dis\tance $2d$ from the lens, what is the new image dis\tance?
A. \frac{2f}{3}
B. \frac{3f}{2}
C. \frac{4f}{3}
D. \frac{5f}{4}
Question 5
A heat engine operates between two temperatures of 500 K and 300 K. If the engine has an efficiency of 30%, what is the temperature of the hot reservoir?
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 6
A 10 μC charge is placed at the center of a circular loop of radius 2 m. If the loop is made of a material with a magnetic permeability of 4π × 10^\( -7 \) H/m, what is the magnetic field at the center of the loop?
A. 1 × 10^\( -6 \) T
B. 2 × 10^\( -6 \) T
C. 4 × 10^\( -6 \) T
D. 6 × 10^\( -6 \) T
Question 7
A 5 kg block is moving with a velocity of 2 m/s on a frictionless surface. If a force of 10 N is applied in the opposite direction, calculate the acceleration of the block.
A. 0.5 m/s^2
B. 1 m/s^2
C. 1.5 m/s^2
D. 2 m/s^2
Question 8
A charged particle of mass 1 kg and charge 2 C is moving in a circular path of radius 1 m with a speed of 5 m/s. Find the magnetic field strength.
A. 0.1 T
B. 0.2 T
C. 0.3 T
D. 0.4 T
Question 9
A 100 W light bulb is connected to a 220 V power source. Calculate the current flowing through the bulb.
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 10
A block of mass 5 kg is placed on a frictionless surface and attached to a horizontal spring with a force cons\tant of 20 N/m. If the block is displaced by 2 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 11
A wave has a frequency of 100 Hz and a wavelength of 2 m. Find the speed of the wave.
A. 200 m/s
B. 300 m/s
C. 400 m/s
D. 500 m/s
Question 12
A radioactive sample has a half-life of 2 years. If the initial activity is 100 Bq, what is the activity after 4 years?
A. 25 Bq
B. 50 Bq
C. 75 Bq
D. 100 Bq
Question 13
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. 8 m/s^2
C. 10 m/s^2
D. 12 m/s^2
Question 14
A point charge of +2 μC is placed at the center of a spherical conductor of radius 0.1 m. Calculate the electric flux through the surface of the sphere.
A. 0 Nm^2/C
B. 2π × 10^-7 Nm^2/C
C. 4π × 10^-7 Nm^2/C
D. 6π × 10^-7 Nm^2/C
Question 15
A magnetic field of 0.5 T is applied to a current-carrying wire of length 2 m. If the current is 5 A, what is the magnitude of the force on the wire?
A. 0.25 N
B. 0.5 N
C. 1 N
D. 2 N

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