POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A radioactive sample decays at a rate of 5% per hour. If the initial activity is 100 Bq, what is the activity after 2 hours?
A. 50 Bq
B. 75 Bq
C. 90 Bq
D. 95 Bq
Question 2
A magnetic field of 0.5 T is applied to a current-carrying wire of length 2.0 m. If the current in the wire is 3.0 A, what is the magnitude of the force experienced by the wire?
A. 0.15 N
B. 0.30 N
C. 0.45 N
D. 0.60 N
Question 3
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the circuit?
A. 1 A
B. 2 A
C. 3 A
D. 4 A
Question 4
A sound wave with a frequency of 200 Hz is traveling through a medium with a speed of 340 m/s. If the wavelength of the sound wave is 1.7 m, what is the amplitude of the wave?
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 5
A heat engine operates between a high-temperature reservoir at 500 K and a low-temperature reservoir at 300 K. If the engine produces 100 J of work per cycle, what is the efficiency of the engine?
A. 0.25
B. 0.30
C. 0.35
D. 0.40
Question 6
A particle of mass 2 kg is moving in a circular orbit of radius 3 m with a speed of 4 m/s. If the particle is subjected to a centripetal force of 10 N, what is the angular velocity of the particle?
A. 2 rad/s
B. 4 rad/s
C. 6 rad/s
D. 8 rad/s
Question 7
A particle of mass 1.0 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.5 m from its equilibrium position, what is the magnitude of the force exerted by the spring on the particle?
A. 25 N
B. 50 N
C. 75 N
D. 100 N
Question 8
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. If the particle is subjected to a centripetal force $F_c = \frac{mv^2}{r}$, what is the acceleration of the particle?
A. \frac{v^2}{r}
B. \frac{2v^2}{r}
C. \frac{mv^2}{r^2}
D. \frac{mv^2}{r}
Question 9
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 10
A circuit consists of a resistor $R = 10 Omega$, an inductor $L = 5 H$, and a capacitor $C = 0.1 F$. If the circuit is driven by a voltage source $V = 10 V$, what is the impedance of the circuit?
A. 15 Omega
B. 20 Omega
C. 25 Omega
D. 30 Omega
Question 11
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If the projectile lands 10 m away from the launch point, what is the time of flight?
A. 1 s
B. 2 s
C. 3 s
D. 4 s
Question 12
A heat engine operates between two temperatures, $T_1 = 300 K$ and $T_2 = 200 K$. If the engine produces 100 J of work per cycle, what is the efficiency of the engine?
A. 20%
B. 30%
C. 40%
D. 50%
Question 13
A radioactive sample decays from 100 Bq to 50 Bq in 10 minutes. What is the half-life of the sample?
A. 5 min
B. 10 min
C. 15 min
D. 20 min
Question 14
A photon of energy 2.0 eV is incident on a metal surface with a work function of 1.5 eV. What is the maximum kinetic energy of the electron emitted?
A. 0.5 eV
B. 1.0 eV
C. 1.5 eV
D. 2.0 eV
Question 15
A gas is contained in a cylinder of volume 2.0 L at a pressure of 1.0 atm. If the gas is heated to a temperature of 300 K, what is the new volume of the gas?
A. 2.5 L
B. 3.0 L
C. 3.5 L
D. 4.0 L

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