POST UTME UNIOSUN 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A current of 2 A flows through a resistor of 4 Ω. What is the power dissipated in the resistor?
A. 16 W
B. 8 W
C. 4 W
D. 2 W
Question 2
A 12 V battery is connected to a 4 Ω resistor. What is the current flowing through the resistor?
A. 1 A
B. 2 A
C. 3 A
D. 4 A
Question 3
A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?
A. 25 Bq
B. 50 Bq
C. 75 Bq
D. 100 Bq
Question 4
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 angular velocity of the particle?
A. 2 rad/s
B. 4 rad/s
C. 6 rad/s
D. 8 rad/s
Question 5
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance.
A. 1.6 x 10^-10 F
B. 2.4 x 10^-10 F
C. 3.2 x 10^-10 F
D. 4.0 x 10^-10 F
Question 6
A parallel plate capacitor has plates of area $A$ and separation $d$. The capaci\tance is given by $C = \frac{epsilon_0 A}{d}$. If the area of the plates is doubled and the separation is halved, what is the new capaci\tance?
A. 4C
B. 2C
C. C
D. C/2
Question 7
A 2.5 V battery is connected in series with a 10 Ω resistor and a 5 μF capacitor. If the capacitor is initially uncharged, what is the time cons\tant of the circuit?
A. 1 ms
B. 10 ms
C. 100 ms
D. 1 s
Question 8
A particle of mass 0.2 kg is moving in a circular path of radius 0.5 m with a speed of 2 m/s. If the particle is subject to a centripetal force of 10 N, calculate the acceleration of the particle.
A. 5.0 m/s^2
B. 6.0 m/s^2
C. 7.0 m/s^2
D. 8.0 m/s^2
Question 9
A gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the temperature is increased by 20°C, what is the new volume?
A. 3.0 L
B. 3.5 L
C. 4.0 L
D. 4.5 L
Question 10
A nucleus of mass number 240 and atomic number 94 undergoes \alpha decay. If the daughter nucleus has a mass number of 228, calculate the energy released in the decay.
A. 1.23 x 10^\( -12 \) J
B. 1.45 x 10^\( -12 \) J
C. 1.67 x 10^\( -12 \) J
D. 1.89 x 10^\( -12 \) J
Question 11
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 net force acting on the particle?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 12
A particle of mass 0.5 kg is attached to a spring with spring cons\tant 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, calculate the maximum speed of the particle.
A. 1.0 m/s
B. 1.4 m/s
C. 1.8 m/s
D. 2.2 m/s
Question 13
A sound wave with a frequency of 200 Hz is emitted from a source moving towards a stationary observer. If the speed of sound in air is 343 m/s, calculate the apparent frequency heard by the observer.
A. 220 Hz
B. 240 Hz
C. 260 Hz
D. 280 Hz
Question 14
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. If the circuit is closed, calculate the current in the circuit.
A. 1.5 A
B. 2.0 A
C. 2.5 A
D. 3.0 A
Question 15
A block of mass 5 kg is moving in a straight line with a velocity of 10 m/s. If the block is subjected to a force of 20 N, what is 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

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