POST UTME NILE UNIVERSITY 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A capacitor consists of two parallel plates of area $A$ and separation $d$. If the plates are charged to a potential difference $V$, what is the capaci\tance $C$ in terms of $A$, $d$, and $V$?
A. \frac{A \epsilon_0}{d}
B. \frac{A d}{\epsilon_0}
C. \frac{\epsilon_0}{A d}
D. \frac{A d^2}{\epsilon_0}
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°, calculate the angle of re\fraction in degrees.
A. 20°
B. 30°
C. 40°
D. 50°
Question 3
A 10 μF capacitor is connected in series with a 5 Ω resistor and a 20 V battery. What is the time cons\tant of the circuit?
A. 0.5 s
B. 1 s
C. 2 s
D. 5 s
Question 4
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 angle between the velocity vector and the radius vector at the ins\tant when the particle is at the top of its circular path?
A. 90°
B. 45°
C. 60°
D. 30°
Question 5
A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm in front of it. Calculate the magnification of the image.
A. 0.5
B. 1
C. 2
D. 3
Question 6
A block of mass 2 kg is placed on a horizontal, frictionless surface. A horizontal force of 10 N is applied to the block. If the block starts from rest, what is its velocity after 2 seconds?
A. 5 m/s
B. 10 m/s
C. 20 m/s
D. 25 m/s
Question 7
A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm from the lens. What is the magnification of the image?
A. 0.5
B. 1
C. 2
D. 4
Question 8
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 force?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 9
A light ray passes through a prism and is re\fracted at an angle of 30°. If the angle of incidence is 20°, what is the angle of re\fraction?
A. 10°
B. 20°
C. 30°
D. 40°
Question 10
A 2.5 mH inductor and a 3.5 mF capacitor are connected in series across a 12 V AC source. If the frequency of the source is 50 Hz, calculate the impedance of the circuit.
A. 10 Ω
B. 15 Ω
C. 20 Ω
D. 25 Ω
Question 11
A block of mass 10 kg is attached to a horizontal spring with a spring cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position and released from rest, calculate its maximum velocity in m/s.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 12
A heat engine operates between a source at 500 K and a \sink at 300 K. If the efficiency of the engine is 30%, what is the temperature of the source?
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 13
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If it is subject to a centripetal force of 10 N, what is its angular velocity?
A. 0.5 rad/s
B. 1 rad/s
C. 2 rad/s
D. 5 rad/s
Question 14
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. The particle is displaced by 0.1 m from its equilibrium position and released from rest. What is the angular frequency of the resulting simple harmonic motion?
A. 10 rad/s
B. 20 rad/s
C. 30 rad/s
D. 40 rad/s
Question 15
A uniform magnetic field of magnitude 2 T is directed along the z-axis. A current of 5 A flows in a circular loop of radius 0.2 m, placed in the x-y plane. What is the magnitude of the magnetic moment of the loop?
A. 0.1 A m^2
B. 0.2 A m^2
C. 0.3 A m^2
D. 0.4 A m^2

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