POST UTME GREENFIELD UNIVERSITY 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sound wave with a frequency of 200 Hz is emitted from a source moving towards a stationary observer. If the speed of sound in air is 343 m/s, calculate the apparent frequency heard by the observer.
A. 220 Hz
B. 240 Hz
C. 260 Hz
D. 280 Hz
Question 2
A magnetic field of 0.5 T is applied to a current-carrying wire of length 1 m. If the current is 2 A, what is the force experienced by the wire?
A. 0.5 N
B. 1 N
C. 1.5 N
D. 2 N
Question 3
A radioactive sample decays at a rate of 0.05% per hour. If the initial mass of the sample is 100 g, what is the mass of the sample after 5 hours?
A. 90.25 g
B. 95.25 g
C. 98.75 g
D. 99.75 g
Question 4
A gas occupies a volume of 2 m³ at a pressure of 1 atm. What is the pressure of the gas if its volume is reduced to 1 m³?
A. 2 atm
B. 3 atm
C. 4 atm
D. 5 atm
Question 5
A particle of mass 1 kg is moving in a circular path of radius 0.5 m with a speed of 2 m/s. If the particle is subjected to a centripetal force of 10 N, calculate the angular velocity of the particle.
A. 10 rad/s
B. 20 rad/s
C. 30 rad/s
D. 40 rad/s
Question 6
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. 8 m/s^2
B. 12 m/s^2
C. 16 m/s^2
D. 20 m/s^2
Question 7
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial volume is 2 L, what is the final volume?
A. 2.5 L
B. 3 L
C. 3.5 L
D. 4 L
Question 8
A photon of wavelength 500 nm is incident on a metal surface. If the work function of the metal is 2 eV, calculate the maximum kinetic energy of the emitted electron.
A. 1.78 eV
B. 2.78 eV
C. 3.78 eV
D. 4.78 eV
Question 9
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. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 10
A radioactive sample has a half-life of 5 years. If the initial activity is 1000 Bq, calculate the activity after 20 years.
A. 100 Bq
B. 200 Bq
C. 400 Bq
D. 800 Bq
Question 11
A gas is contained in a cylinder of volume 2.5 L at a temperature of 300 K. If the gas is heated to 400 K, what is the new volume of the gas, assuming the pressure remains cons\tant?
A. 3.75 L
B. 4.5 L
C. 5.25 L
D. 6.0 L
Question 12
A parallel plate capacitor consists of two plates, each of area 0.01 m^2, separated by a dis\tance of 0.001 m. If the capaci\tance is 10 nF, calculate the charge stored when the potential difference between the plates is 5 V.
A. 50 nC
B. 100 nC
C. 200 nC
D. 500 nC
Question 13
A particle of mass 2.0 kg is moving in a circular path of radius 3.0 m with a cons\tant speed of 4.0 m/s. What is the magnitude of the centripetal acceleration?
A. 0.5 m/s²
B. 1.0 m/s²
C. 2.0 m/s²
D. 4.0 m/s²
Question 14
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 acceleration of 2 m/s^2, what is the magnitude of the force acting on the particle?
A. 8 N
B. 10 N
C. 12 N
D. 16 N
Question 15
A wave has a frequency of 50 Hz and a wavelength of 0.2 m. What is the speed of the wave?
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s

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