POST UTME EKSU 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 10 V battery is connected to a 2 Ω resistor in series with a 4 Ω resistor. What is the current flowing through the 2 Ω resistor?
A. 1.5 A
B. 2 A
C. 2.5 A
D. 3 A
Question 2
A gas is heated from 300 K to 400 K. If the volume of the gas is doubled, what is the new pressure of the gas?
A. 1.5 atm
B. 2 atm
C. 3 atm
D. 4 atm
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. What is the magnitude of the force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 4
A gas expands from 1.0 L to 2.0 L against a cons\tant external pressure of 2.0 atm. Calculate the work done by the gas.
A. 4 J
B. 8 J
C. 16 J
D. 32 J
Question 5
A particle of mass 1.0 kg is moving in a circular path with a radius of 2.0 m. If the particle has a speed of 4.0 m/s, calculate the centripetal force acting on the particle.
A. 5.0 N
B. 10 N
C. 20 N
D. 40 N
Question 6
A capacitor is connected in series with a 10 Ω resistor and a 120 V AC source. What is the current through the capacitor?
A. 2.5 A
B. 5.0 A
C. 7.5 A
D. 10 A
Question 7
A lens has a focal length of 20 cm. An object is placed 30 cm from the lens. What is the image dis\tance?
A. -60 cm
B. -40 cm
C. -20 cm
D. 10 cm
Question 8
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 voltage across the 6 Ω resistor?
A. 6 V
B. 8 V
C. 10 V
D. 12 V
Question 9
A gas is compressed from an initial volume of 10 L to a final volume of 5 L at a cons\tant temperature of 300 K. If the initial pressure is 2 atm, what is the final pressure?
A. 1 atm
B. 2 atm
C. 3 atm
D. 4 atm
Question 10
A gas is enclosed in a container at a cons\tant temperature. The volume of the gas is doubled. What is the effect on the pressure of the gas?
A. The pressure increases by a factor of 2
B. The pressure remains the same
C. The pressure decreases by a factor of 2
D. The pressure increases by a factor of 4
Question 11
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial volume is 2.5 L, what is the final volume?
A. 3.33 L
B. 4.17 L
C. 5.00 L
D. 6.25 L
Question 12
A radioactive sample has a half-life of 5 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 13
A radioactive sample has a half-life of 5 years. If the initial activity is 1000 Bq, what is the activity after 15 years?
A. 125 Bq
B. 250 Bq
C. 500 Bq
D. 1000 Bq
Question 14
A 100 W light bulb is connected to a 220 V AC source. Calculate the current flowing through the bulb.
A. 0.5 A
B. 1 A
C. 2 A
D. 5 A
Question 15
A heat engine operates between a high-temperature reservoir at 500 K and a low-temperature reservoir at 300 K. If the engine produces 100 J of work per cycle, what is the efficiency of the engine?
A. 20%
B. 30%
C. 40%
D. 50%

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