POST UTME RHEMA 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 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 angular velocity of the particle?
A. 2 rad/s
B. 4 rad/s
C. 6 rad/s
D. 8 rad/s
Question 2
A 100 V AC source is connected to a 50 Ω resistor. If the current through the resistor is 2 A, what is the power consumed by the resistor?
A. 200 W
B. 250 W
C. 300 W
D. 350 W
Question 3
A parallel-plate capacitor consists of two plates of area $A$ and separation $d$. If the capacitor is charged to a potential difference $V$, find the capaci\tance $C$.
A. \( \frac{\epsilon_0 A}{d} \)
B. \( \frac{\epsilon_0 d}{A} \)
C. \( \frac{A}{\epsilon_0 d} \)
D. \( \frac{d}{\epsilon_0 A} \)
Question 4
A projectile is launched from the ground with an initial velocity of 50 m/s at an angle of 60° above the horizontal. What is the maximum height reached by the projectile?
A. 25 m
B. 50 m
C. 75 m
D. 100 m
Question 5
A light ray passes through a prism and is re\fracted. If the angle of incidence is 40° and the angle of re\fraction is 30°, what is the angle of deviation?
Question 6
A 1000 Ω resistor is connected in series with a 2000 Ω resistor and a 3000 Ω resistor. What is the total resis\tance of the circuit?
A. 4000 Ω
B. 5000 Ω
C. 6000 Ω
D. 7000 Ω
Question 7
A magnetic field of magnitude $B$ is directed perp\endicular to a current-carrying wire of length $L$. If the current is $I$, find the force $F$ on the wire.
A. \( ILB \sin \theta \)
B. \( ILB \cos \theta \)
C. \( \frac{ILB}{\sin \theta} \)
D. \( \frac{ILB}{\cos \theta} \)
Question 8
A capacitor consists of two parallel plates separated by a dis\tance of 0.01 m. If the charge on each plate is 0.001 C, what is the capaci\tance of the capacitor?
A. 100 F
B. 1000 F
C. 10000 F
D. 100000 F
Question 9
A light ray passes from air into a glass of re\fractive index $n = 1.5$. If the angle of incidence is $30^\circ$, what is the angle of re\fraction?
A. 20^\circ
B. 30^\circ
C. 40^\circ
D. 50^\circ
Question 10
A 50 Hz AC voltage is applied across a 20 Ω resistor. What is the rms value of the current flowing through the resistor?
A. 2.5 A
B. 5.0 A
C. 7.5 A
D. 10 A
Question 11
A spring with spring cons\tant $k$ is stretched by a dis\tance $x$. The work done in stretching the spring is given by $W = \frac{1}{2} kx^2$. If the spring is stretched by a dis\tance of $2$ m, what is the work done?
A. 2 J
B. 4 J
C. 6 J
D. 8 J
Question 12
A sound wave with frequency $f$ is traveling through a medium with speed $v$. If the wave is reflected off a surface, what is the frequency of the reflected wave?
A. f
B. 2f
C. f/2
D. v/f
Question 13
A 2 kg block of ice at 0°C is placed in a 5°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), what is the time it takes for the ice to melt completely?
A. 10 minutes
B. 20 minutes
C. 30 minutes
D. 40 minutes
Question 14
A particle is projected from the origin with an initial velocity of 20 m/s at an angle of 60° above the horizontal. What is the time of flight of the particle?
A. 2 s
B. 4 s
C. 6 s
D. 8 s
Question 15
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 40°, what is the angle of deviation?
A. 20°
B. 30°
C. 40°
D. 50°

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