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POST UTME UI 2020 Physics | Objective

Are you preparing for POST UTME UI 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 radioactive sample of uranium-238 decays into thorium-234 with a half-life of 4.5 billion years. If the initial amount of uranium-238 is 100 g, what is the amount of thorium-234 produced after 9 billion years?

A. 50 g

B. 75 g

C. 100 g

Correct D. 125 g

Correct Answer: D

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Question 2

A sound wave with a frequency of 200 Hz and an amplitude of 0.5 m is traveling through a medium with a speed of 340 m/s. What is the wavelength of the sound wave?

Correct A. 1.7 m

B. 1.7 cm

C. 1.7 km

D. 1.7 mm

Correct Answer: A

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Question 3

A magnetic field with a strength of 0.5 T is directed perp\endicular to a current-carrying wire with a current of 2 A. What is the force exerted on a 0.1 m length of the wire?

A. 0.05 N

Correct B. 0.1 N

C. 0.2 N

D. 0.5 N

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 100 N/m. If the block is displaced by 0.2 m from its equilibrium position, what is the force exerted on the block?

Correct A. -20 N

B. -10 N

C. 10 N

D. 20 N

Correct Answer: A

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Question 5

A liquid with a density of 1000 kg/m^3 is flowing through a pipe with a radius of 0.1 m. If the pressure difference between the two \ends of the pipe is 1000 Pa, what is the velocity of the liquid?

A. 10 m/s

B. 20 m/s

Correct C. 30 m/s

D. 40 m/s

Correct Answer: C

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Question 6

A nucleus of mass number 238 and atomic number 92 undergoes \alpha decay. What is the mass number of the daughter nucleus?

Correct A. 234

B. 236

C. 238

D. 240

Correct Answer: A

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Question 7

A particle of mass 1.67 × 10^-27 kg is moving in a circular path of radius 0.5 m with a speed of 20 m/s. What is the magnitude of the magnetic field required to produce this motion?

A. 0.01 T

B. 0.05 T

Correct C. 0.1 T

D. 0.5 T

Correct Answer: C

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Question 8

A gas at 300 K has a pressure of 1 atm. If the temperature is increased to 400 K, what is the new pressure?

A. 1.33 atm

B. 1.5 atm

Correct C. 1.67 atm

D. 2 atm

Correct Answer: C

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Question 9

A block of mass 5 kg 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 the maximum speed of the block?

A. 0.5 m/s

B. 1 m/s

Correct C. 1.5 m/s

D. 2 m/s

Correct Answer: C

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Question 10

A particle of charge 2 μC is moving in a circular path of radius 0.1 m with a speed of 10 m/s. What is the magnitude of the electric field required to produce this motion?

A. 0.01 N/C

B. 0.05 N/C

Correct C. 0.1 N/C

D. 0.5 N/C

Correct Answer: C

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Question 11

A parallel plate capacitor with plate area A and separation d is charged to a potential V. If the separation is doubled to 2d, what is the new potential V'?

Correct A. 1/2

B. 1

C. 2

D. 4

Correct Answer: A

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Question 12

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. 18°

Correct B. 20°

C. 22°

D. 25°

Correct Answer: B

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Question 13

A 100 Ω resistor is connected in series with a 50 Ω resistor and a 20 Ω resistor. What is the equivalent resis\tance?

Correct A. 170 Ω

B. 180 Ω

C. 190 Ω

D. 200 Ω

Correct Answer: A

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Question 14

A 5 kg block is moving with a velocity of 2 m/s. What is its kinetic energy?

A. 5 J

Correct B. 10 J

C. 15 J

D. 20 J

Correct Answer: B

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Question 15

A 10 μF capacitor is connected in parallel with a 20 μF capacitor. What is the equivalent capaci\tance?

A. 10 μF

B. 20 μF

Correct C. 30 μF

D. 40 μF

Correct Answer: C

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Question 16

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

A. 2 m/s

Correct B. 4 m/s

C. 6 m/s

D. 8 m/s

Correct Answer: B

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Question 17

A photon of wavelength 400 nm is incident on a metal surface. If the work function of the metal is 2.5 eV, what is the maximum kinetic energy of the emitted electron?

Correct A. 1.5 eV

B. 2.5 eV

C. 3.5 eV

D. 4.5 eV

Correct Answer: A

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Question 18

A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm in front of it. What is the magnification of the image?

A. -1

Correct B. -2

C. -3

D. -4

Correct Answer: B

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Question 19

A gas is compressed adiabatically from an initial volume of 2 m^3 to a final volume of 1 m^3. If the initial temperature is 300 K, what is the final temperature?

A. 200 K

B. 250 K

C. 300 K

Correct D. 350 K

Correct Answer: D

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Question 20

A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 4 m/s. What is the magnitude of the force acting on the particle?

A. 10 N

Correct B. 20 N

C. 30 N

D. 40 N

Correct Answer: B

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Question 21

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. 12 N

Correct C. 16 N

D. 20 N

Correct Answer: C

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Question 22

A 10 μF capacitor is connected in series with a 20 kΩ resistor. If a voltage of 100 V is applied across the circuit, what is the current flowing through the circuit?

A. 5 mA

B. 10 mA

Correct C. 20 mA

D. 50 mA

Correct Answer: C

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Question 23

A block 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 acceleration of the block?

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 24

A 100 Ω resistor is connected in parallel with a 200 Ω resistor. If a voltage of 50 V is applied across the circuit, what is the current flowing through the 100 Ω resistor?

A. 0.5 A

Correct B. 1 A

C. 1.5 A

D. 2 A

Correct Answer: B

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Question 25

A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 5 m/s. If the particle is subjected to a centripetal acceleration of 1 m/s^2, what is the magnitude of the force acting on the particle?

A. 2 N

B. 4 N

Correct C. 6 N

D. 8 N

Correct Answer: C

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