POST UTME LEAD CITY UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sound wave with frequency 200 Hz is traveling through a medium with speed 340 m/s. If the amplitude of the wave is 0.01 m, calculate the intensity of the wave.
A. 10^-3 W/m^2
B. 10^-2 W/m^2
C. 10^-1 W/m^2
D. 1 W/m^2
Question 2
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 3
A gas at 200 K has a volume of 1.5 L. If the temperature is increased to 400 K, what is the new volume of the gas, assuming the number of moles remains cons\tant?
A. 3.125 L
B. 4.0 L
C. 5.0 L
D. 6.25 L
Question 4
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 5
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 6
A radioactive sample of Δₗ emits Δₗα particles with a half-life of 3.8 × 10¹ years. If the initial activity is 1.2 × 10¹ Bq, what is the activity after 1.2 × 10¹ years?
A. 4.8 × 10¹ Bq
B. 2.4 × 10¹ Bq
C. 1.2 × 10¹ Bq
D. 6.0 × 10¹ Bq
Question 7
A sound wave with a frequency of 200 Hz is traveling through a medium with a speed of 340 m/s. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.7 cm
C. 1.7 mm
D. 1.7 km
Question 8
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 9
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 10
A 5 kg object is moving in a circular path with a radius of 2 m and a speed of 4 m/s. If the object is subjected to a cons\tant force of 10 N, what is the acceleration of the object?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 11
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle has a speed of 4 m/s, calculate the centripetal force acting on the particle.
A. 12 N
B. 24 N
C. 36 N
D. 48 N
Question 12
A 2 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 0.5 m/s
B. 1 m/s
C. 2 m/s
D. 5 m/s
Question 13
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If the air resis\tance is negligible, calculate the maximum height reached by the projectile.
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 14
A body of mass 2 kg is placed on a spring with a spring cons\tant of 100 N/m. If the body is displaced by 0.2 m from its equilibrium position, what is the potential energy stored in the spring?
A. 2 J
B. 4 J
C. 6 J
D. 8 J
Question 15
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

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