POST UTME LEAD CITY UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A vector has a magnitude of 5 m and makes an angle of 30° with the positive x-axis. What is the x-component of the vector?
A. 4 m
B. 5 m
C. 6 m
D. 7 m
Question 2
A block of mass 5.0 × 10¹ kg is attached to a spring of spring cons\tant 2.0 × 10¹ N/m. The block is displaced by 1.0 × 10¹ m from its equilibrium position and released from rest. What is the frequency of the resulting oscillations?
A. 1.0 × 10¹ Hz
B. 2.0 × 10¹ Hz
C. 3.0 × 10¹ Hz
D. 4.0 × 10¹ Hz
Question 3
A light ray passes from air into a glass slab 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 4
A magnetic field of 0.5 T is applied to a coil of wire with 100 turns. If the current in the coil is 2 A, what is the magnetic flux through the coil?
A. 100 Wb
B. 200 Wb
C. 300 Wb
D. 400 Wb
Question 5
A point charge of 2 μC is placed at a dis\tance of 0.5 m from a point charge of -3 μC. What is the magnitude of the electric field at a point 0.2 m from the -3 μC charge?
A. 100 N/C
B. 200 N/C
C. 300 N/C
D. 400 N/C
Question 6
A gas at 300 K expands from 1 L to 2 L against a cons\tant external pressure of 2 atm. Calculate the work done by the gas.
A. -4 J
B. -2 J
C. 2 J
D. 4 J
Question 7
A light ray passes through a prism with an angle of incidence of 30° and an angle of re\fraction of 20°. What is the angle of deviation?
A. 10°
B. 15°
C. 20°
D. 25°
Question 8
A gas is heated from 300 K to 400 K at cons\tant volume. What is the change in internal energy of the gas?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 9
A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across the plates, calculate the charge stored on the capacitor.
A. 200 μC
B. 400 μC
C. 600 μC
D. 800 μC
Question 10
A particle of mass 2.0 × 10¹ kg is moving in a circular path of radius 1.5 × 10¹ m with a speed of 3.0 × 10¹ m/s. What is the magnitude of the magnetic field required to keep the particle in this path?
A. 0.10 T
B. 0.20 T
C. 0.30 T
D. 0.40 T
Question 11
A heat engine operates between 500 K and 300 K. If the efficiency of the engine is 30%, what is the temperature of the hot reservoir?
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 12
A \tank contains 100 L of water at a temperature of 20°C. If 10 kg of ice at 0°C is added to the \tank, calculate the final temperature of the water.
A. 0°C
B. 5°C
C. 10°C
D. 15°C
Question 13
A capacitor of capaci\tance 2.0 × 10¹ F is connected to a battery of voltage 1.5 × 10¹ V. What is the energy stored in the capacitor?
A. 3.0 × 10¹ J
B. 4.5 × 10¹ J
C. 6.0 × 10¹ J
D. 7.5 × 10¹ J
Question 14
A body is in equilibrium under the action of three forces. If the magnitude of two of the forces is 10 N and 15 N, respectively, and the angle between them is 60°, what is the magnitude of the third force?
A. 20 N
B. 25 N
C. 30 N
D. 35 N
Question 15
A block of mass 2 kg is placed on a frictionless surface and attached to a horizontal spring with spring cons\tant 50 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, calculate the angular frequency of the block's motion.
A. 1 rad/s
B. 2 rad/s
C. 3 rad/s
D. 4 rad/s

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