POST UTME NILE UNIVERSITY 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A photon of wavelength 400 nm is incident on a metal surface. If the work function of the metal is 2.5 eV, what is the maximum kinetic energy of the emitted electron?
A. 1.25 eV
B. 2.5 eV
C. 3.75 eV
D. 5.0 eV
Question 2
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. 1.0
C. 2.0
D. -1.0
Question 3
A thermodynamic system is in equilibrium at 300 K. If 100 J of heat is added to the system, what is the change in entropy?
A. 0.3 J/K
B. 0.6 J/K
C. 1.0 J/K
D. 1.5 J/K
Question 4
A block of mass 5 kg is susp\ended from a spring with a spring cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position and released, 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 5
A block of mass $m$ is attached to a horizontal, massless spring with force cons\tant $k$. If the block is displaced by a dis\tance $x$ from its equilibrium position and released from rest, what is the angular frequency of the resulting simple harmonic motion?
A. \( \sqrt{\frac{k}{m}} \)
B. \( \frac{k}{m} \)
C. \( \frac{m}{k} \)
D. \( \frac{1}{\sqrt{km}} \)
Question 6
A 5 μF capacitor is connected in parallel with a 10 kΩ resistor. If the voltage across the capacitor is 100 V, find the charge on the capacitor.
A. 0.5 μC
B. 1.0 μC
C. 1.5 μC
D. 2.0 μC
Question 7
A 2.5 mH inductor is connected in series with a 10 Ω resistor and a 20 V battery. If the initial current is 0 A, find the current after 0.1 s.
A. 0.5 A
B. 1.0 A
C. 1.5 A
D. 2.0 A
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 uniform magnetic field of 2 T, what is the magnitude of the magnetic force acting on the particle?
A. 0.8 N
B. 1.2 N
C. 1.6 N
D. 2.4 N
Question 9
A particle is moving in a circular path with radius 2 m and period 4 s. Calculate the magnitude of the centripetal acceleration.
A. 1.59 m/s^2
B. 1.60 m/s^2
C. 1.61 m/s^2
D. 1.62 m/s^2
Question 10
A pressure gauge reads 200 kPa. If the atmospheric pressure is 101.3 kPa, what is the gauge pressure?
A. 99.7 kPa
B. 100.3 kPa
C. 101.3 kPa
D. 200 kPa
Question 11
A uniform magnetic field of magnitude 2 T is directed along the z-axis. A current of 5 A flows through a wire loop of radius 0.1 m placed in the x-y plane. Calculate the magnitude of the magnetic moment of the loop.
A. 0.1 A m^2
B. 0.5 A m^2
C. 1 A m^2
D. 5 A m^2
Question 12
A sound wave with frequency 200 Hz and amplitude 0.01 m is traveling through a medium with speed 343 m/s. Calculate the wavelength of the wave.
A. 1.71 m
B. 1.72 m
C. 1.73 m
D. 1.74 m
Question 13
A 2.5 μF capacitor is connected in parallel with a 5 kΩ resistor. If the voltage across the capacitor is 50 V, find the charge on the capacitor.
A. 0.25 μC
B. 0.5 μC
C. 0.75 μC
D. 1.0 μC
Question 14
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the circuit?
A. 1 A
B. 2 A
C. 3 A
D. 4 A
Question 15
A 10 Ω resistor is connected in series with a 20 V battery. If the current is 0.5 A, find the power dissipated by the resistor.
A. 5 W
B. 10 W
C. 15 W
D. 20 W

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