POST UTME UNIBEN 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A nucleus has a mass number of 240 and an atomic number of 94. What is the mass defect?
A. 1.0 u
B. 2.0 u
C. 3.0 u
D. 4.0 u
Question 2
A heat engine operates between a high-temperature reservoir at 500 K and a low-temperature reservoir at 300 K. If the engine has an efficiency of 30%, what is the temperature of the high-temperature reservoir?
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 3
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. If the air resis\tance is negligible, what is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 4
A wire of length $L$ and resis\tance $R$ is stretched to twice its original length. What is the new resis\tance of the wire?
A. R' = \frac{R}{2}
B. R' = 2R
C. R' = 4R
D. R' = \frac{R}{4}
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 uniform magnetic field of strength 2 T directed perp\endicular to the plane of the circular path, what is the magnitude of the magnetic force acting on the particle?
A. 8 N
B. 10 N
C. 12 N
D. 15 N
Question 6
A light ray is incident on a glass slab at an angle of 30°. The re\fractive index of the glass is 1.5. Calculate the angle of re\fraction.
A. 20°
B. 25°
C. 30°
D. 35°
Question 7
A particle of mass 2 kg is projected from the origin with an initial velocity of 20 m/s at an angle of 60° to the horizontal. If the particle is subject to a uniform gravitational field of 10 m/s², calculate the time taken for the particle to reach its maximum height.
A. 1.5 s
B. 2.0 s
C. 2.5 s
D. 3.0 s
Question 8
A radioactive sample decays at a rate of 2% per hour. If the initial activity is 1000 Bq, what is the activity after 3 hours?
A. 500 Bq
B. 750 Bq
C. 900 Bq
D. 1000 Bq
Question 9
A charged particle of mass $m$ and charge $q$ is moving in a uniform magnetic field $B$ with a velocity $v$. The particle is deflected by an angle $\theta$ from its original path. Find the magnitude of the magnetic field $B$ in terms of $m$, $q$, $v$, and $\theta$.
A. mv/\( q\sin\theta \)
B. mv/q\sin\theta
C. mv/\( q\cos\theta \)
D. mv/q\cos\theta
Question 10
A simple harmonic motion has a maximum displacement of 2 m and a frequency of 3 Hz. What is the angular frequency of the motion?
A. 6 rad/s
B. 12 rad/s
C. 18 rad/s
D. 24 rad/s
Question 11
A wave has a frequency of 50 Hz and a wavelength of 0.2 m. Calculate the speed of the wave.
A. 10 m/s
B. 20 m/s
C. 25 m/s
D. 30 m/s
Question 12
A radioactive sample has a half-life of 5.0 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 20 Bq
B. 40 Bq
C. 60 Bq
D. 80 Bq
Question 13
A body of mass 2 kg is moving with a velocity of 5 m/s. Calculate the kinetic energy of the body.
A. 10 J
B. 20 J
C. 25 J
D. 30 J
Question 14
A heat engine operates between two temperatures, 500 K and 300 K. If the engine absorbs 1000 J of heat energy from the high-temperature reservoir, what is the efficiency of the engine?
A. 0.25
B. 0.30
C. 0.35
D. 0.40
Question 15
A particle of mass 2 kg is moving in a circular orbit of radius 3 m with a speed of 4 m/s. If the particle is subjected to a magnetic field of strength 2 T, what is the magnitude of the magnetic force acting on the particle?
A. 12 N
B. 16 N
C. 20 N
D. 24 N

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: