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POST UTME KSU 2020 Physics | Objective

Are you preparing for POST UTME KSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8.0 µF, what is the value of the dielectric cons\tant?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 2

A particle of mass 2.0 kg is moving in a circular path of radius 3.0 m with a cons\tant speed of 4.0 m/s. What is the magnitude of the net force acting on the particle?

A. 8.0 N

B. 10.0 N

Correct C. 12.0 N

D. 15.0 N

Correct Answer: C

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Question 3

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°

Correct B. 25°

C. 30°

D. 35°

Correct Answer: B

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Question 4

A 100 W light bulb is connected to a 220 V power source. What is the current drawn by the bulb?

A. 0.25 A

B. 0.5 A

C. 0.75 A

Correct D. 1.0 A

Correct Answer: D

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Question 5

A gas occupies a volume of 2.0 L at a pressure of 1.0 atm. What is the pressure of the gas if its volume is reduced to 1.0 L?

A. 2.0 atm

B. 3.0 atm

C. 4.0 atm

Correct D. 5.0 atm

Correct Answer: D

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Question 6

A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. The particle is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the angular frequency of the particle's motion.

A. 5 rad/s

B. 10 rad/s

Correct C. 20 rad/s

D. 50 rad/s

Correct Answer: C

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Question 7

A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 1000 Bq, calculate the activity of the sample after 20 years.

A. 125 Bq

Correct B. 250 Bq

C. 500 Bq

D. 1000 Bq

Correct Answer: B

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Question 8

A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. If a voltage of 20 V is applied across the circuit, calculate the current flowing through the 5 Ω resistor.

Correct A. 0.5 A

B. 1 A

C. 2 A

D. 4 A

Correct Answer: A

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Question 9

A heat engine operates between a high-temperature reservoir at 500 K and a low-temperature reservoir at 300 K. If the engine has an efficiency of 30%, calculate the maximum possible work output of the engine.

A. 1000 J

B. 2000 J

Correct C. 3000 J

D. 4000 J

Correct Answer: C

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Question 10

A particle of mass 1 kg is moving in a circular path with a radius of 2 m. If the particle has a speed of 4 m/s, calculate the centripetal acceleration of the particle.

A. 1 m/s^2

B. 2 m/s^2

Correct C. 4 m/s^2

D. 8 m/s^2

Correct Answer: C

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Question 11

A radioactive sample of Uranium-238 undergoes \alpha decay. If the initial mass of the sample is 100 g, and the mass of the \alpha particle is 4 u, what is the mass of the daughter nucleus after 10 half-lives?

A. 36 g

B. 40 g

Correct C. 44 g

D. 48 g

Correct Answer: C

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Question 12

A sound wave with a frequency of 200 Hz is traveling through a medium with a speed of 340 m/s. What is the wavelength of the sound wave?

A. 1.7 m

Correct B. 1.8 m

C. 1.9 m

D. 2.0 m

Correct Answer: B

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Question 13

A capacitor consists of two parallel plates separated by a dis\tance of 2 mm. If the capaci\tance is 10 nF, what is the charge stored on the capacitor when a potential difference of 5 V is applied?

A. 50 nC

B. 60 nC

Correct C. 70 nC

D. 80 nC

Correct Answer: C

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Question 14

A circuit consists of a 10 Ω resistor and a 20 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, what is the current flowing through the circuit?

A. 0.6 A

B. 0.7 A

Correct C. 0.8 A

D. 0.9 A

Correct Answer: C

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Question 15

A lens with a focal length of 20 cm is used to form an image of an object placed 30 cm away from the lens. What is the magnification of the lens?

A. 0.5

Correct B. 0.6

C. 0.7

D. 0.8

Correct Answer: B

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Question 16

A radioactive sample emits \alpha particles with a half-life of 5 days. If the initial activity is 100 Bq, what is the activity after 15 days?

Correct A. 12.5 Bq

B. 25 Bq

C. 50 Bq

D. 100 Bq

Correct Answer: A

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Question 17

A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If a dielectric slab of thickness 2 mm and dielectric cons\tant 3 is inserted between the plates, what is the new capaci\tance?

A. 30 μF

B. 40 μF

Correct C. 50 μF

D. 60 μF

Correct Answer: C

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Question 18

A particle of mass 2 kg is moving in a circular path with a radius of 3 m and a speed of 4 m/s. What is the centripetal force acting on the particle?

A. 10 N

B. 20 N

Correct C. 30 N

D. 40 N

Correct Answer: C

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Question 19

A wave has a frequency of 100 Hz and a wavelength of 2 m. What is the speed of the wave?

A. 200 m/s

Correct B. 400 m/s

C. 600 m/s

D. 800 m/s

Correct Answer: B

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Question 20

A gas has a pressure of 100 kPa and a volume of 2 m^3. What is the temperature of the gas?

A. 300 K

B. 400 K

Correct C. 500 K

D. 600 K

Correct Answer: C

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Question 21

A sound wave with a frequency of 200 Hz is produced by 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

Correct B. 240 Hz

C. 260 Hz

D. 280 Hz

Correct Answer: B

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Question 22

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in parallel. Calculate the total resis\tance of the circuit.

A. 2 Ω

B. 3 Ω

Correct C. 4 Ω

D. 6 Ω

Correct Answer: C

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Question 23

A thermodynamic system undergoes a process from state A to state B. If the initial temperature is 300 K and the final temperature is 400 K, calculate the change in entropy.

A. 10 J/K

B. 20 J/K

Correct C. 30 J/K

D. 40 J/K

Correct Answer: C

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Question 24

A quantum particle has a wave function given by \psi(x) = Ae^{ikx}. If the particle is in a one-dimensional box of length L, calculate the normalization cons\tant A.

A. \sqrt{\frac{1}{L}}

Correct B. \sqrt{\frac{2}{L}}

C. \sqrt{\frac{3}{L}}

D. \sqrt{\frac{4}{L}}

Correct Answer: B

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Question 25

A circuit consists of a 9 V battery, a 2 Ω resistor, and a 3 Ω resistor connected in series. Calculate the total resis\tance of the circuit.

A. 3 Ω

B. 4 Ω

Correct C. 5 Ω

D. 6 Ω

Correct Answer: C

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