POST UTME LASU 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A block of mass 4 kg is placed on a frictionless surface and attached to a horizontal spring with a force cons\tant of 150 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, what is the frequency of the block's motion?
A. 2 Hz
B. 3 Hz
C. 4 Hz
D. 5 Hz
Question 2
A particle of mass 2 kg moves 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 net force acting on the particle?
A. 8 N
B. 10 N
C. 12 N
D. 16 N
Question 3
A 100 W bulb is connected to a 220 V mains supply. Calculate the current drawn by the bulb.
A. 0.45 A
B. 0.5 A
C. 0.55 A
D. 0.6 A
Question 4
A light ray is incident on a spherical mirror with a radius of curvature of 20 cm. If the angle of incidence is 30°, calculate the angle of reflection.
A. 15°
B. 30°
C. 45°
D. 60°
Question 5
A heat engine operates between two temperatures, 300 K and 400 K. If the efficiency of the engine is 30%, what is the temperature of the hot reservoir?
A. 350 K
B. 400 K
C. 450 K
D. 500 K
Question 6
A magnetic field is produced by a current-carrying wire. If the current is 2 A and the length of the wire is 0.5 m, what is the magnetic field strength at a dis\tance of 0.2 m from the wire?
A. 0.1 T
B. 0.2 T
C. 0.5 T
D. 1 T
Question 7
A circuit consists of a 100 Ω resistor, a 200 Ω resistor, and a 50 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, what is the current flowing through the 50 Ω resistor?
A. 0.2 A
B. 0.4 A
C. 0.6 A
D. 0.8 A
Question 8
A gas at 300 K and 1 atm expands to occupy a volume of 2.5 L. If the pressure is reduced to 0.5 atm, what is the new temperature of the gas?
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 9
A thermodynamic system undergoes a process where the temperature remains cons\tant. If the system absorbs 200 J of heat energy, and the work done by the system is 100 J, what is the change in internal energy of the system?
A. -100 J
B. 0 J
C. 100 J
D. 200 J
Question 10
A gas is confined to a container with a volume of 0.5 m^3. If the temperature of the gas is increased from 300 K to 400 K, what is the new volume of the gas?
A. 0.5 m^3
B. 1 m^3
C. 1.5 m^3
D. 2 m^3
Question 11
A particle is moving in a circular path with a radius of 2 m. If the particle completes one revolution in 4 seconds, what is the angular velocity of the particle?
A. 1.0 rad/s
B. 2.0 rad/s
C. 3.0 rad/s
D. 4.0 rad/s
Question 12
A radioactive sample has a half-life of 5 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 13
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. 2 m/s²
B. 4 m/s²
C. 6 m/s²
D. 8 m/s²
Question 14
A particle of mass 2.5 kg is moving with a velocity of 4.2 m/s. If the particle experiences a force of 12 N due to friction, what is the acceleration of the particle?
A. 5.0 m/s^2
B. 6.0 m/s^2
C. 7.0 m/s^2
D. 8.0 m/s^2
Question 15
A thermodynamic system undergoes a cyclic process, where the initial and final states are identical. If the system absorbs 500 J of heat energy during the process, and the work done by the system is 200 J, what is the change in internal energy of the system?
A. -300 J
B. 300 J
C. -500 J
D. 500 J

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