POST UTME REDEEMERS UNIVERSITY 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A wave has a frequency of 50 Hz and a wavelength of 0.1 m. What is the speed of the wave?
A. 2 m/s
B. 5 m/s
C. 10 m/s
D. 20 m/s
Question 2
A sound wave with a frequency of 200 Hz and an amplitude of 0.5 m is traveling through a medium with a speed of 340 m/s. If the wave is reflected from a rigid wall, what is the intensity of the reflected wave?
A. 100 W/m^2
B. 200 W/m^2
C. 300 W/m^2
D. 400 W/m^2
Question 3
A radioactive sample decays at a rate of 0.5% per hour. If the initial activity is 1000 Bq, calculate the activity after 2 hours.
A. 900 Bq
B. 950 Bq
C. 1000 Bq
D. 1050 Bq
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 magnitude of the acceleration of the particle?
A. 6 m/s^2
B. 12 m/s^2
C. 18 m/s^2
D. 24 m/s^2
Question 5
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 acting on the particle?
A. 10 N
B. 12 N
C. 14 N
D. 16 N
Question 6
A ray of light passes from air into a glass 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 7
A particle of mass 3 kg is moving in a circular path of radius 4 m with a cons\tant speed of 5 m/s. If the particle is subject to a centripetal force of 15 N, what is the magnitude of the acceleration of the particle?
A. 12 m/s^2
B. 15 m/s^2
C. 18 m/s^2
D. 20 m/s^2
Question 8
A gas is heated from 20°C to 80°C at cons\tant volume. If the initial pressure is 1 atm, what is the final pressure?
A. 2 atm
B. 3 atm
C. 4 atm
D. 5 atm
Question 9
A sound wave has a frequency of 200 Hz and an amplitude of 0.2 m. What is the intensity of the sound wave?
A. 0.10 W/m²
B. 0.20 W/m²
C. 0.30 W/m²
D. 0.40 W/m²
Question 10
A sound wave with a frequency of 200 Hz and a wavelength of 1.5 m is traveling through a medium. If the speed of the wave is 300 m/s, what is the amplitude of the wave?
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 11
A block of mass 5 kg is attached to a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position, calculate the force exerted by the spring.
A. 20 N
B. 40 N
C. 60 N
D. 80 N
Question 12
A car travels from rest to a speed of 25 m/s in 10 s. If the car is subjected to a cons\tant acceleration of 2 m/s^2, what is the dis\tance traveled by the car?
A. 50 m
B. 100 m
C. 150 m
D. 200 m
Question 13
A light ray is incident on a concave mirror at a dis\tance of 10 cm from the mirror. If the focal length of the mirror is 5 cm, calculate the position of the image.
A. 20 cm
B. 30 cm
C. 40 cm
D. 50 cm
Question 14
A lens of focal length 20 cm is used to form an image of an object placed 30 cm away from the lens. What is the magnification of the lens?
A. -1
B. -2
C. -3
D. -4
Question 15
A circuit consists of a resistor $R$, an inductor $L$, and a capacitor $C$ connected in series. If the circuit is driven by an alternating current source with a frequency of $f$, what is the impedance of the circuit?
A. \( R + jomega L + \frac{1}{jomega C} \)
B. \( R + jomega L - \frac{1}{jomega C} \)
C. \( R - jomega L + \frac{1}{jomega C} \)
D. \( R - jomega L - \frac{1}{jomega C} \)

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