POST UTME GREENFIELD UNIVERSITY 2024 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A parallel plate capacitor has a capaci\tance of 2 μF and is charged to a potential difference of 10 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?
A. 1 μF
B. 2 μF
C. 4 μF
D. 8 μF
Question 2
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 3
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 4
A wave has a frequency of 100 Hz and a wavelength of 0.5 m. If it is traveling through a medium with a speed of 200 m/s, what is its amplitude?
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 5
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 6
A 100 V AC supply is connected to a 50 Ω resistor. What is the current flowing through the resistor?
A. 2 A
B. 4 A
C. 6 A
D. 8 A
Question 7
A gas occupies a volume of 2 L at a pressure of 1 atm and a temperature of 300 K. Calculate the volume of the gas at a pressure of 2 atm and a temperature of 400 K.
A. 1 L
B. 2 L
C. 3 L
D. 4 L
Question 8
A force of 10 N acts on an object, cau\sing it to accelerate at a rate of 2 m/s^2. What is the mass of the object?
A. 2.5 kg
B. 5 kg
C. 10 kg
D. 20 kg
Question 9
A particle of mass $m$ is confined to a one-dimensional box of length $L$. The wave function of the particle is given by $psi(x) = \sqrt{\frac{2}{L}} \sinleft\( \frac{npi x}{L}\right \)$, where $n$ is a positive integer. What is the expectation value of the position of the particle?
A. 0
B. L/2
C. L
D. nπL/2
Question 10
A light ray passes from air into a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 25°
C. 30°
D. 35°
Question 11
A 100 Ω resistor is connected in series with a 50 Ω resistor and a 20 Ω resistor. What is the equivalent resis\tance of the circuit?
A. 170 Ω
B. 180 Ω
C. 190 Ω
D. 200 Ω
Question 12
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 13
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. 1.5 A
B. 2 A
C. 3 A
D. 4 A
Question 14
A radioactive sample of uranium-238 has a half-life of 4.5 billion years. If the initial activity of the sample is 100 Bq, what is the activity after 9 billion years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 15
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

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