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POST UTME RHEMA UNIVERSITY 2022 Physics | Objective

Are you preparing for POST UTME RHEMA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 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 a capaci\tance of 10 μF. If a potential difference of 20 V is applied across the plates, calculate the charge stored on the capacitor.

A. 0.2 C

Correct B. 0.4 C

C. 0.6 C

D. 0.8 C

Correct Answer: B

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Question 2

A circuit consists of a 12 Ω resistor, a 20 Ω resistor, and a 10 Ω resistor connected in series. If a voltage of 24 V is applied across the circuit, calculate the current flowing through the 10 Ω resistor.

A. 0.5 A

B. 1.0 A

Correct C. 1.5 A

D. 2.0 A

Correct Answer: C

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Question 3

A gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the pressure is increased to 3.0 atm, calculate the new volume of the gas.

A. 1.0 L

Correct B. 1.5 L

C. 2.0 L

D. 2.5 L

Correct Answer: B

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Question 4

A block of mass 5 kg is attached to a spring with a spring cons\tant of 200 N/m. If the block is displaced by 0.2 m from its equilibrium position, calculate the force exerted by the spring on the block.

A. 40 N

B. 60 N

Correct C. 80 N

D. 100 N

Correct Answer: C

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Question 5

A heat engine operates between a temperature of 500 K and a temperature of 300 K. If the engine absorbs 100 J of heat energy, calculate the efficiency of the engine.

A. 0.25

B. 0.30

Correct C. 0.35

D. 0.40

Correct Answer: C

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Question 6

A parallel beam of light of wavelength 600 nm is incident on a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.

Correct A. 20°

B. 30°

C. 40°

D. 50°

Correct Answer: A

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Question 7

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 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 8

A gas occupies a volume of 2 L at a pressure of 1 atm and a temperature of 300 K. Calculate the new volume if the pressure is increased to 2 atm and the temperature is decreased to 200 K.

A. 1 L

B. 2 L

Correct C. 3 L

D. 4 L

Correct Answer: C

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Question 9

A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 45° above the horizontal. Calculate the maximum height reached by the projectile.

A. 10 m

Correct B. 20 m

C. 30 m

D. 40 m

Correct Answer: B

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Question 10

A car is traveling at a speed of 50 km/h. If the driver applies the brakes and the car comes to a stop in 5 s, calculate the acceleration of the car.

A. -10 m/s^2

B. -20 m/s^2

Correct C. -30 m/s^2

D. -40 m/s^2

Correct Answer: C

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Question 11

A 1000 W heater is used to heat a 5 kg block of copper from 20°C to 80°C. Assuming the specific heat capacity of copper is 0.385 J/g°C, calculate the time taken to heat the block to the desired temperature.

A. 10 minutes

B. 20 minutes

Correct C. 30 minutes

D. 40 minutes

Correct Answer: C

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Question 12

A 200 V, 50 Hz AC supply is connected to a 100 Ω resistor. Calculate the rms current flowing through the resistor.

A. 0.5 A

Correct B. 1.0 A

C. 1.5 A

D. 2.0 A

Correct Answer: B

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Question 13

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 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 14

A 1000 W, 200 V AC supply is connected to a 50 Ω resistor. Calculate the power factor of the circuit.

A. 0.5

Correct B. 0.6

C. 0.7

D. 0.8

Correct Answer: B

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Question 15

A 1000 J of energy is transferred to a 2 kg block of copper. Calculate the temperature rise of the block.

A. 10°C

B. 20°C

Correct C. 30°C

D. 40°C

Correct Answer: C

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Question 16

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 magnitude of the acceleration of the particle?

A. 2 m/s^2

B. 4 m/s^2

Correct C. 6 m/s^2

D. 8 m/s^2

Correct Answer: C

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Question 17

A light ray passes through a prism of angle 60° and is re\fracted at an angle of 30°. If the angle of incidence is 45°, what is the angle of emergence?

A. 30°

Correct B. 45°

C. 60°

D. 90°

Correct Answer: B

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Question 18

A quantum particle of mass 1 kg is confined to a one-dimensional box of length 2 m. If the particle is in the ground state, what is the energy of the particle?

Correct A. 1.05 \times 10^{-36} J

B. 1.05 \times 10^{-34} J

C. 1.05 \times 10^{-32} J

D. 1.05 \times 10^{-30} J

Correct Answer: A

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Question 19

A thermodynamic system undergoes a process from state A to state B. If the system absorbs 100 J of heat and does 50 J of work, what is the change in internal energy of the system?

A. 50 J

Correct B. 100 J

C. 150 J

D. 200 J

Correct Answer: B

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Question 20

A light source emits a beam of light with a wavelength of 500 nm. If the beam is incident on a dif\fraction grating with 1000 lines/mm, what is the angle of dif\fraction?

A. 30°

B. 45°

Correct C. 60°

D. 90°

Correct Answer: C

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Question 21

A particle of mass 2 kg is moving in a circular path of radius 4 m with a cons\tant speed of 6 m/s. If the particle is subjected to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?

A. 8 m/s^2

Correct B. 12 m/s^2

C. 16 m/s^2

D. 24 m/s^2

Correct Answer: B

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Question 22

A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. What is the focal length of the combination?

A. -5 cm

B. 5 cm

Correct C. 10 cm

D. 20 cm

Correct Answer: C

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Question 23

A 100 V battery is connected to a 10 Ω resistor and a 20 Ω resistor in parallel. What is the current drawn from the battery?

A. 2 A

Correct B. 4 A

C. 6 A

D. 8 A

Correct Answer: B

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Question 24

A body of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, what is the change in its kinetic energy?

A. 50 J

Correct B. 100 J

C. 150 J

D. 200 J

Correct Answer: B

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Question 25

A gas expands from an initial volume of 2 L to a final volume of 5 L against an external pressure of 1 atm. What is the work done by the gas?

A. 10 J

Correct B. 20 J

C. 30 J

D. 40 J

Correct Answer: B

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