POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. Calculate the magnitude of the centripetal force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 2
A gas at a pressure of 2 atm and temperature of 300 K is allowed to expand to a volume of 5 L. Calculate the work done by the gas during the expansion.
A. -10 J
B. -20 J
C. -30 J
D. -40 J
Question 3
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 30 Ω resistor connected in series. If a voltage of 120 V is applied across the circuit, what is the current flowing through the circuit?
A. 2 A
B. 3 A
C. 4 A
D. 5 A
Question 4
A 100 W light bulb is connected to a 120 V power source. Find the current flowing through the bulb.
A. 0.8 A
B. 1.2 A
C. 1.5 A
D. 2 A
Question 5
A block of mass 5 kg is placed on a horizontal surface. A force of 20 N is applied to the block, cau\sing it to accelerate at 2 m/s^2. What is the coefficient of friction between the block and the surface?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 6
A 240 V AC supply is connected to a 20 Ω resistor. Calculate the rms value of the current flowing through the resistor.
A. 12 A
B. 15 A
C. 20 A
D. 25 A
Question 7
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. If air resis\tance is neglected, what is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 8
A uniform magnetic field of magnitude 2 T is directed along the positive z-axis. A current of 5 A flows in a circular loop of radius 0.1 m, placed in the x-y plane. Calculate the magnitude of the magnetic moment of the loop.
A. 0.1 A m^2
B. 0.5 A m^2
C. 1 A m^2
D. 5 A m^2
Question 9
A wave of frequency 50 Hz and amplitude 0.2 m is traveling along a string. If the wave is reflected from a fixed \end, what is the magnitude of the resulting s\tanding wave?
A. 0.4 m
B. 0.6 m
C. 0.8 m
D. 1.0 m
Question 10
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. 10 N
B. 12 N
C. 8 N
D. 6 N
Question 11
A nucleus of mass number 240 and atomic number 94 undergoes \alpha decay. What is the mass number of the daughter nucleus?
A. 232
B. 236
C. 240
D. 244
Question 12
A 5 mH inductor is connected in series with a 10 Ω resistor and a 20 V battery. If the initial current is 0 A, find the current at t = 2 s.
A. 4 A
B. 6 A
C. 8 A
D. 10 A
Question 13
A 100 W light bulb is connected to a 220 V power source. If the bulb is used for 5 hours a day, what is the total energy consumed by the bulb in a month?
A. 120 kWh
B. 150 kWh
C. 180 kWh
D. 200 kWh
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 force of 12 N, what is the magnitude of the acceleration of the particle?
A. 10 m/s^2
B. 12 m/s^2
C. 15 m/s^2
D. 20 m/s^2
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. Find the magnitude of the force acting on the particle.
A. 10 N
B. 12 N
C. 15 N
D. 20 N

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