POST UTME WELLSPRING UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A circuit consists of a 10 Ω resistor and a 20 Ω resistor connected in parallel. If a voltage of 12 V is applied across the circuit, calculate the current drawn by the 10 Ω resistor.
A. 0.5 A
B. 1.0 A
C. 1.5 A
D. 2.0 A
Question 2
A wave is traveling through a medium. If the frequency of the wave is doubled, what happens to the wavelength?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Increases by a factor of 8
D. Remains the same
Question 3
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 30 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, calculate the current flowing through the circuit.
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 4
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 2.5 x 10^-10 F, what is the charge stored when the potential difference is 100 V?
A. 1.25 x 10^-7 C
B. 2.5 x 10^-7 C
C. 5.0 x 10^-7 C
D. 1.0 x 10^-6 C
Question 5
A capacitor of capaci\tance 10^-6 F is charged to a potential difference of 100 V. If it is connected to a resistor of resis\tance 1000 ohms, what is the time cons\tant?
A. 0.01 s
B. 0.1 s
C. 1.0 s
D. 10 s
Question 6
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60 degrees above the horizontal. Assuming a cons\tant acceleration due to gravity of 9.8 m/s^2, calculate the time of flight of the projectile.
A. 2 s
B. 4 s
C. 6 s
D. 8 s
Question 7
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. The capaci\tance is 2.5 x 10^-10 F. If a potential difference of 10 V is applied across the plates, calculate the charge stored on the capacitor.
A. 1.25 x 10^-9 C
B. 2.5 x 10^-9 C
C. 5 x 10^-9 C
D. 7.5 x 10^-9 C
Question 8
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
Question 9
A block of mass 2 kg is attached to a horizontal spring with spring cons\tant 100 N/m. The block is displaced by 0.1 m from its equilibrium position and released from rest. Calculate the maximum speed of the block.
A. 0.5 m/s
B. 1 m/s
C. 1.5 m/s
D. 2 m/s
Question 10
A radioactive sample decays from 100 g to 50 g in 10 days. Assuming a first-order decay process, calculate the half-life of the sample.
A. 5 days
B. 10 days
C. 15 days
D. 20 days
Question 11
A capacitor is connected to a power source. If the frequency of the power source is doubled, what happens to the current through the capacitor?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Increases by a factor of 8
D. Remains the same
Question 12
A heat engine operates between the temperatures 300 K and 600 K. If it has an efficiency of 30%, what is the maximum possible work output?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 13
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^-6 F, what is the charge stored when the potential difference between the plates is 10 V?
A. 4.0 x 10^-5 C
B. 8.0 x 10^-5 C
C. 1.6 x 10^-4 C
D. 3.2 x 10^-4 C
Question 14
A gas is enclosed in a container with a movable piston. The gas is heated from 300 K to 400 K at cons\tant volume. What is the ratio of the final pressure to the initial pressure?
A. 1:1
B. 1:2
C. 2:1
D. 3:1
Question 15
A 2 kg block is attached to 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 potential energy stored in the spring?
A. 2 J
B. 4 J
C. 6 J
D. 8 J

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