POST UTME UNN 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
A gas at temperature 300 K expands from 1 L to 2 L against a cons\tant external pressure of 2 atm. Assuming the gas is ideal, calculate the work done by the gas.
A. -1.38 kJ
B. -1.73 kJ
C. -2.09 kJ
D. -2.45 kJ
Question 3
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial volume is 2.00 L, what is the final volume?
A. 2.00 L
B. 4.00 L
C. 6.00 L
D. 8.00 L
Question 4
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 magnitude of the acceleration of the particle?
A. \frac{v^2}{r}
B. \frac{mv^2}{r}
C. \frac{v}{r}
D. \frac{m}{r}
Question 5
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8.0 x 10^-10 F, what is the charge on the plates when the potential difference between them is 100 V?
A. 4.0 x 10^-8 C
B. 8.0 x 10^-8 C
C. 1.6 x 10^-7 C
D. 3.2 x 10^-7 C
Question 6
A parallel plate capacitor has a capaci\tance of $C = 2 \mu F$. If a potential difference of $V = 10 V$ is applied across the plates, what is the charge stored on the capacitor?
A. 20 \mu C
B. 40 \mu C
C. 60 \mu C
D. 80 \mu C
Question 7
A particle of mass 1.00 kg is moving in a straight line with a velocity of 5.00 m/s. If the particle is subjected to a force of 10.0 N, what is the acceleration of the particle?
A. 1.00 m/s^2
B. 2.00 m/s^2
C. 3.00 m/s^2
D. 4.00 m/s^2
Question 8
A circuit consists of a resistor $R = 10 \Omega$ and an inductor $L = 5 H$ in series. If a voltage source of $V = 20 V$ is applied across the circuit, what is the current flowing through the circuit?
A. 2 A
B. 4 A
C. 6 A
D. 8 A
Question 9
A beam of light passes through a prism and is re\fracted. If the angle of incidence is 30° and the angle of re\fraction is 20°, what is the angle of deviation?
A. 10°
B. 20°
C. 30°
D. 40°
Question 10
A 5 kg block is moving in a circular path with a cons\tant speed of 4 m/s. If the radius of the path is 3 m, calculate the magnitude of the centripetal force.
A. 4 N
B. 6 N
C. 8 N
D. 10 N
Question 11
A light ray passes through a prism with an angle of incidence of 30° and an angle of re\fraction of 20°. Find the angle of deviation.
A. 10°
B. 20°
C. 30°
D. 40°
Question 12
A block of mass 5 kg is placed on a horizontal, frictionless surface. A horizontal force of 10 N is applied to the block. Calculate the acceleration of the block.
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 13
A radioactive sample has an initial activity of 100 Bq. If the half-life of the sample is 10 minutes, what is the activity of the sample after 20 minutes?
A. 50 Bq
B. 25 Bq
C. 12.5 Bq
D. 6.25 Bq
Question 14
A 5 kg block is attached to a horizontal spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, find the maximum speed of the block.
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
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. What is the magnitude of the force acting on the particle?
A. 8 N
B. 12 N
C. 16 N
D. 20 N

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