POST UTME LASU 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sound wave has a frequency of 200 Hz and a speed of 340 m/s. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.9 m
C. 2.1 m
D. 2.3 m
Question 2
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. 18°
B. 20°
C. 22°
D. 25°
Question 3
A block of mass 5 kg is attached to a horizontal spring with a force cons\tant of 200 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 4
A heat engine has an efficiency of 30%. If the input energy is 100 J, what is the output energy?
A. 30 J
B. 40 J
C. 50 J
D. 60 J
Question 5
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. If the block is displaced by 0.15 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 6
A simple harmonic motion has a maximum displacement of 5 m and a period of 2 s. What is the angular frequency?
A. 1 rad/s
B. 2 rad/s
C. 3 rad/s
D. 4 rad/s
Question 7
A 50 Hz AC voltage is applied to a circuit with a resis\tance of 10 Ω and an inductive reac\tance of 20 Ω. What is the impedance of the circuit?
A. 20 Ω
B. 22.36 Ω
C. 25 Ω
D. 30 Ω
Question 8
A measurement of 5.2 m is made with an uncertainty of 0.1 m. What is the relative uncertainty?
A. 0.02
B. 0.05
C. 0.1
D. 0.2
Question 9
A magnetic field of 0.5 T is applied to a current-carrying wire. If the current in the wire is 2 A, what is the force experienced by the wire?
A. 0.5 N
B. 1 N
C. 2 N
D. 5 N
Question 10
A parallel plate capacitor has a capaci\tance of 5 μF and is charged to a potential difference of 10 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?
A. 2.5 μF
B. 5.0 μF
C. 10.0 μF
D. 20.0 μF
Question 11
A 10 μF capacitor is charged to a potential difference of 20 V. If the capacitor is then connected to a 5 Ω resistor, what is the time cons\tant of the circuit?
A. 0.1 s
B. 0.5 s
C. 1.0 s
D. 2.0 s
Question 12
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle's angular velocity is 4 rad/s, what is its linear velocity?
A. 6 m/s
B. 8 m/s
C. 10 m/s
D. 12 m/s
Question 13
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8 nF, what is the dielectric cons\tant of the material between the plates?
A. 2.5
B. 3.2
C. 4.1
D. 5.6
Question 14
A block of mass 2 kg is attached to a horizontal, massless spring with a force cons\tant of 50 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, what is the angular frequency of the block?
A. 1.0 rad/s
B. 2.0 rad/s
C. 3.0 rad/s
D. 4.0 rad/s
Question 15
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. What is the magnitude of the centripetal acceleration?
A. 0.5 m/s^2
B. 1.2 m/s^2
C. 2.5 m/s^2
D. 4.8 m/s^2

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