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POST UTME NOUN 2020 Physics | Objective

Are you preparing for POST UTME NOUN 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 2 kg block of copper is heated from 20°C to 80°C. If the specific heat capacity of copper is 0.385 J/g°C, calculate the energy required to heat the block.

A. 1500 J

B. 2000 J

Correct C. 2500 J

D. 3000 J

Correct Answer: C

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Question 2

A radioactive sample has a half-life of 5 years. If the initial activity is 1000 Bq, what is the activity after 10 years?

Correct A. 125 Bq

B. 250 Bq

C. 500 Bq

D. 1000 Bq

Correct Answer: A

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Question 3

A 5 kg block is attached to a horizontal spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position, calculate the potential energy stored in the spring.

A. 10 J

B. 20 J

Correct C. 30 J

D. 40 J

Correct Answer: C

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Question 4

A 10 μF capacitor is connected in series with a 20 Ω resistor. If a 12 V battery is connected across the circuit, calculate the current flowing through the resistor.

A. 0.6 A

B. 0.8 A

Correct C. 1.0 A

D. 1.2 A

Correct Answer: C

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Question 5

A 2 kg block is moving in a circular path with a radius of 1 m. If the block has a speed of 4 m/s, calculate the centripetal force acting on the block.

A. 16 N

B. 32 N

Correct C. 48 N

D. 64 N

Correct Answer: C

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Question 6

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 7

A heat engine operates between the temperatures of 500 K and 300 K. If the engine absorbs 1000 J of heat energy from the high-temperature reservoir, what is the efficiency of the engine?

A. 0.2

Correct B. 0.3

C. 0.4

D. 0.5

Correct Answer: B

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Question 8

A gas is contained in a cylinder of volume 2 m^3 at a pressure of 100 kPa. If the temperature of the gas is increased by 20 K, what is the new pressure of the gas?

A. 120 kPa

B. 140 kPa

Correct C. 160 kPa

D. 180 kPa

Correct Answer: C

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Question 9

A spring with a spring cons\tant of 100 N/m is stretched by 0.5 m. What is the potential energy stored in the spring?

A. 12.5 J

B. 25 J

Correct C. 37.5 J

D. 50 J

Correct Answer: C

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Question 10

A block of mass 5 kg is attached to a horizontal spring with a spring cons\tant of 200 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum speed of the block?

A. 2 m/s

B. 4 m/s

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

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Question 11

A particle of mass 2 kg is attached to a spring with spring cons\tant 100 N/m. The particle is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the time taken for the particle to reach its maximum speed.

A. 0.5 s

B. 1 s

Correct C. 1.5 s

D. 2 s

Correct Answer: C

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Question 12

A block of mass 5 kg is placed on a frictionless surface and attached to a horizontal spring with spring cons\tant 200 N/m. The block is displaced by 1 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the acceleration of the block at the ins\tant it passes through its equilibrium position.

A. 10 m/s^2

Correct B. 20 m/s^2

C. 30 m/s^2

D. 40 m/s^2

Correct Answer: B

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Question 13

A \tank contains 1000 L of water at a pressure of 2 atm. A valve is opened, allowing water to flow out of the \tank at a rate of 0.5 L/s. Assuming the water is incompressible and the \tank is open to the atmosphere, calculate the time taken for the water level to drop by 10 cm.

A. 20 s

B. 40 s

Correct C. 60 s

D. 80 s

Correct Answer: C

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Question 14

A particle of mass 1 kg is moving in a circular path with a radius of 2 m. The particle is subject to a centripetal force of 10 N. Calculate the speed of the particle.

A. 2 m/s

B. 4 m/s

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

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Question 15

A block of mass 3 kg is placed on a frictionless surface and attached to a horizontal spring with spring cons\tant 150 N/m. The block is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the maximum speed of the block.

A. 2 m/s

B. 4 m/s

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

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Question 16

A solid cylindrical block of wood has a radius of 0.05 m and a height of 0.2 m. If the density of the wood is 500 kg/m³, calculate the pressure at the bottom of the block when it is submerged in water.

A. 1000 Pa

B. 2000 Pa

Correct C. 5000 Pa

D. 10000 Pa

Correct Answer: C

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Question 17

A capacitor consists of two parallel plates, each of area 0.01 m², separated by a dis\tance of 0.001 m. If the capaci\tance is 10 nF, calculate the charge stored when the potential difference between the plates is 10 V.

Correct A. 0.1 C

B. 0.2 C

C. 0.5 C

D. 1 C

Correct Answer: A

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Question 18

A lens of focal length 0.2 m is placed in a beam of light. If the object dis\tance is 0.5 m, calculate the image dis\tance.

A. -0.1 m

Correct B. -0.2 m

C. -0.3 m

D. -0.4 m

Correct Answer: B

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Question 19

A body of mass 2 kg is moving with a velocity of 5 m/s. If the force applied to the body is 10 N, calculate the acceleration of the body.

A. 0.5 m/s²

B. 1 m/s²

Correct C. 2 m/s²

D. 5 m/s²

Correct Answer: C

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Question 20

A heat engine operates between the temperatures 300 K and 600 K. If the efficiency of the engine is 30%, calculate the work done per cycle.

A. 100 J

B. 200 J

Correct C. 500 J

D. 1000 J

Correct Answer: C

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Question 21

A parallel plate capacitor with plate area A and separation d has a capaci\tance C. If the plate separation is doubled while the plate area remains cons\tant, what is the new capaci\tance?

Correct A. C/2

B. C

C. 2C

D. 4C

Correct Answer: A

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Question 22

A light ray passes through a convex lens and is focused at a dis\tance of 20 cm from the lens. If the object dis\tance is 30 cm, what is the focal length of the lens?

Correct A. 10 cm

B. 20 cm

C. 30 cm

D. 40 cm

Correct Answer: A

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Question 23

A gas at pressure P1 and volume V1 is heated to a temperature T2. If the final pressure is P2 and the final volume is V2, what is the ratio of the initial and final pressures?

Correct A. P1/P2

B. P2/P1

C. V1/V2

D. V2/V1

Correct Answer: A

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Question 24

A particle of mass m is moving in a circular path of radius r with a cons\tant speed v. What is the magnitude of the centripetal force acting on the particle?

Correct A. mv^2/r

B. mv/r

C. mv^2

D. mv

Correct Answer: A

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Question 25

A light wave has a frequency f and a wavelength λ. What is the speed of the light wave?

Correct A. fλ

B. f/λ

C. λ/f

D. λ

Correct Answer: A

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