POST UTME GREENFIELD UNIVERSITY 2024 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A capacitor of capaci\tance 2 μF is connected to a 12 V battery. What is the charge stored on the capacitor?
A. 24 μC
B. 48 μC
C. 96 μC
D. 192 μC
Question 2
A magnetic field of 0.5 T is directed perp\endicular to a current-carrying wire of length 2 m. If the current in the wire is 5 A, what is the magnitude of the force on the wire?
A. 0.1 N
B. 0.5 N
C. 1 N
D. 5 N
Question 3
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. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 4
A particle of mass 1 kg is moving in a circular path with a radius of 2 m. If the particle has a velocity of 5 m/s, what is the centripetal acceleration of the particle?
A. 1 m/s^2
B. 2 m/s^2
C. 3 m/s^2
D. 4 m/s^2
Question 5
A 10 Ω resistor is connected in parallel with a 20 Ω resistor. What is the equivalent resis\tance of the circuit?
A. 5 Ω
B. 10 Ω
C. 15 Ω
D. 20 Ω
Question 6
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. If the current in the circuit is 2 A, what is the potential difference across the 6 Ω resistor?
A. 8 V
B. 12 V
C. 16 V
D. 20 V
Question 7
A vector $mathbf{a}$ has a magnitude of 5 units and points in the direction of the positive x-axis. A vector $mathbf{b}$ has a magnitude of 3 units and points in the direction of the positive y-axis. What is the magnitude of the sum of the two vectors?
A. 4 units
B. 5 units
C. 6 units
D. 8 units
Question 8
A 2 kg block of ice at 0°C is placed in a 10°C water bath. Assuming the specific heat capacity of ice is 2090 J/kg°C and the specific heat capacity of water is 4186 J/kg°C, calculate the time it takes for the ice to melt completely.
A. 10 minutes
B. 20 minutes
C. 30 minutes
D. 40 minutes
Question 9
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. Find the focal length of the combination.
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
Question 10
A circuit consists of a 12 V battery, a 4 Ω resistor, and an inductor with an induc\tance of 2 H. The circuit is connected to a switch that is closed at time $t=0$. What is the current in the circuit at time $t=10$ ms?
A. 0.5 A
B. 1 A
C. 2 A
D. 4 A
Question 11
A magnetic field of strength 0.5 T is directed along the z-axis. What is the magnetic flux through a circular loop of radius 0.2 m and area 0.1 m^2?
A. 0.05 Wb
B. 0.1 Wb
C. 0.15 Wb
D. 0.2 Wb
Question 12
A sound wave with a frequency of 200 Hz has a speed of 340 m/s. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2.0 m
Question 13
A light ray passes from air into a glass slab of thickness 5 cm and re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 30°
C. 40°
D. 50°
Question 14
A 2.5 kg block of ice at 0°C is placed in a 10°C water bath. Assuming the specific heat capacity of ice is 2090 J/kg°C and the specific heat capacity of water is 4186 J/kg°C, calculate the time it takes for the ice to melt completely.
A. 10 minutes
B. 20 minutes
C. 30 minutes
D. 40 minutes
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. Calculate the magnitude of the centripetal force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N

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