Practice Post UTME ACHIEVERS UNIVERSITY physics 2020 Past Questions

Question 1

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 net force acting on the particle?

A. 8 N

B. 12 N

Correct C. 16 N

D. 20 N

Correct Answer: C

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Question 2

A 240 V, 10 A current is supplied to a circuit containing a 12 Ω resistor and a 20 Ω resistor in series. What is the total resis\tance in the circuit?

A. 32 Ω

B. 36 Ω

Correct C. 40 Ω

D. 44 Ω

Correct Answer: C

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Question 3

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

A. 0.4 A

Correct B. 0.5 A

C. 0.6 A

D. 0.7 A

Correct Answer: B

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Question 4

A 5 kg block is moving with a speed of 2 m/s on a frictionless surface. What is the kinetic energy of the block?

A. 10 J

Correct B. 20 J

C. 30 J

D. 40 J

Correct Answer: B

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Question 5

A 10 kg object is moving in a circular path with a cons\tant speed of 5 m/s. What is the magnitude of the centripetal force acting on the object?

A. 25 N

B. 30 N

Correct C. 35 N

D. 40 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 acceleration of 2 m/s^2, what is the magnitude of the force acting on the particle?

A. 8 N

B. 10 N

Correct C. 12 N

D. 16 N

Correct Answer: C

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Question 7

A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If the acceleration due to gravity is 9.8 m/s^2, what is the maximum height reached by the projectile?

A. 10 m

B. 15 m

Correct C. 20 m

D. 25 m

Correct Answer: C

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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 simple harmonic motion has a maximum displacement of 5 m and a period of 2 s. If the motion starts from its equilibrium position, what is the amplitude of the motion?

Correct A. 2.5 m

B. 3 m

C. 4 m

D. 5 m

Correct Answer: A

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Question 10

A vector has a magnitude of 5 units and makes an angle of 30° with the positive x-axis. If the vector is rotated by 60° in the counterclockwise direction, what is the new magnitude of the vector?

A. 5 units

B. 6 units

Correct C. 7 units

D. 8 units

Correct Answer: C

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Question 11

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 acceleration of 2 m/s^2, what is the magnitude of the force acting on the particle?

A. 8 N

B. 10 N

Correct C. 12 N

D. 16 N

Correct Answer: C

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Question 12

A magnetic field of 0.5 T is applied to a current-carrying wire of length 2 m. If the current in the wire is 3 A, what is the magnitude of the force acting on the wire?

A. 0.3 N

B. 0.6 N

Correct C. 0.9 N

D. 1.2 N

Correct Answer: C

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Question 13

A gas is heated from 300 K to 400 K. If the initial volume of the gas is 2 m^3 and the final volume is 3 m^3, what is the magnitude of the work done on the gas?

A. 100 J

B. 200 J

Correct C. 300 J

D. 400 J

Correct Answer: C

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Question 14

A 60 Hz AC circuit has a resis\tance of 10 Ω and an inductive reac\tance of 20 Ω. If the circuit is connected to a 120 V AC source, what is the magnitude of the current flowing through the circuit?

A. 2 A

B. 4 A

Correct C. 6 A

D. 8 A

Correct Answer: C

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Question 15

A heat engine operates between two temperatures of 500 K and 300 K. If the engine has an efficiency of 30%, what is the magnitude of the work done by the engine?

A. 1000 J

B. 2000 J

Correct C. 3000 J

D. 4000 J

Correct Answer: C

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Question 16

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

A. 1 A

Correct B. 2 A

C. 3 A

D. 4 A

Correct Answer: B

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Question 17

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 18

A light ray passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.

A. 20°

B. 30°

Correct C. 40°

D. 50°

Correct Answer: C

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Question 19

A 100 W bulb is connected to a 200 V AC supply. Calculate the current flowing through the bulb.

A. 0.5 A

Correct B. 1 A

C. 1.5 A

D. 2 A

Correct Answer: B

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Question 20

A gas occupies a volume of 2 L at a pressure of 1 atm. Calculate the pressure required to compress the gas to a volume of 1 L.

A. 2 atm

B. 3 atm

Correct C. 4 atm

D. 5 atm

Correct Answer: C

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Question 21

A 10 μF capacitor is connected in series with a 5 kΩ resistor and a 20 V battery. If the capacitor is initially uncharged, what is the time cons\tant of the circuit?

A. 0.1 s

Correct B. 0.5 s

C. 1 s

D. 5 s

Correct Answer: B

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Question 22

A light ray passes through a prism with an angle of incidence of 30° and an angle of re\fraction of 20°. What is the angle of deviation?

Correct A. 10°

B. 20°

C. 30°

D. 40°

Correct Answer: A

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Question 23

A 2 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, what is its maximum speed?

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 24

A 100 μF capacitor is connected in parallel with a 10 kΩ resistor and a 20 V battery. If the capacitor is initially uncharged, what is the current in the circuit?

A. 2 mA

Correct B. 4 mA

C. 6 mA

D. 8 mA

Correct Answer: B

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Question 25

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

A. 10 cm

B. 20 cm

C. 30 cm

Correct D. 40 cm

Correct Answer: D

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