POST UTME COVENANT UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2 kg block of ice at 0°C is placed in a 5°C water bath. Assuming the specific heat capacity of ice is 2090 J/(kg·K) and the specific heat capacity of water is 4186 J/(kg·K), calculate the time it takes for the ice to melt completely.
A. 10 minutes
B. 20 minutes
C. 30 minutes
D. 40 minutes
Question 2
A particle of mass 2 kg is attached to a spring with spring cons\tant 100 N/m. It is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the angular frequency of the particle's motion.
A. 1 rad/s
B. 2 rad/s
C. 5 rad/s
D. 10 rad/s
Question 3
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
Question 4
A body of mass 3 kg is moving in a circular path of radius 2 m with a cons\tant speed of 5 m/s. If the body is subjected to a centripetal force of 15 N, what is the magnitude of the acceleration of the body?
A. 6 m/s^2
B. 8 m/s^2
C. 10 m/s^2
D. 12 m/s^2
Question 5
A 10 V battery is connected to a 100 Ω resistor. What is the current flowing through the resistor?
A. 0.1 A
B. 0.2 A
C. 0.3 A
D. 0.4 A
Question 6
A beam of light is incident on a surface at an angle of 30°. If the reflected light is at an angle of 60° to the normal, calculate the angle of incidence.
A. 30°
B. 45°
C. 60°
D. 90°
Question 7
A circuit consists of a 9 V battery, a 2 Ω resistor, and a 3 Ω resistor connected in parallel. What is the current flowing through the 2 Ω resistor?
A. 2 A
B. 3 A
C. 4 A
D. 5 A
Question 8
A magnetic field of 0.5 T is applied to a coil of 100 turns and a radius of 0.2 m. If the current in the coil is 2 A, what is the magnitude of the torque experienced by the coil?
A. 0.1 Nm
B. 0.2 Nm
C. 0.3 Nm
D. 0.4 Nm
Question 9
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 10
A 100 Ω resistor is connected in series with a 200 Ω resistor. If a current of 2 A flows through the circuit, what is the potential difference across the 200 Ω resistor?
A. 100 V
B. 200 V
C. 400 V
D. 600 V
Question 11
A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across it, what is the charge stored on each plate?
A. 20 μC
B. 40 μC
C. 80 μC
D. 100 μC
Question 12
A block of mass 5 kg is susp\ended from a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position, what is the force exerted by the spring on the block?
A. 10 N
B. 20 N
C. 50 N
D. 100 N
Question 13
A magnetic field of 0.5 T is directed perp\endicular to the plane of a circular loop of wire with a radius of 0.1 m. If the loop is carrying a current of 2 A, calculate the magnitude of the magnetic moment of the loop.
A. 0.1 A m^2
B. 0.2 A m^2
C. 0.5 A m^2
D. 1 A m^2
Question 14
A nucleus of mass number $A$ and atomic number $Z$ undergoes \beta decay, emitting an electron of energy $E$. Find the energy $Q$ released in the decay.
A. E
B. -E
C. E + \frac{E}{A}
D. -E + \frac{E}{A}
Question 15
A particle of mass 0.5 kg is moving in a circular path of radius 2 m with a cons\tant speed of 4 m/s. If the particle is subject to a centripetal force of 10 N, calculate the angle between the force and the radius vector.
A. 30°
B. 45°
C. 60°
D. 90°

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