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POST UTME NILE UNIVERSITY 2019 Physics | Objective

Are you preparing for POST UTME NILE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1

A block of mass 2 kg is susp\ended from a spring with a spring 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 as it passes through the equilibrium position?

A. 0.2 m/s

Correct B. 0.4 m/s

C. 0.6 m/s

D. 0.8 m/s

Correct Answer: B

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Question 2

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 0.5 mm and dielectric cons\tant 5 is inserted between the plates, what is the new capaci\tance?

A. 15 μF

B. 20 μF

Correct C. 25 μF

D. 30 μF

Correct Answer: C

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Question 3

A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. If a voltage of 15 V is applied across the circuit, what is the current through the 5 Ω resistor?

A. 0.3 A

B. 0.4 A

Correct C. 0.5 A

D. 0.6 A

Correct Answer: C

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Question 4

A radioactive sample has an initial activity of 100 Bq. If the half-life of the sample is 10 minutes, what is the activity after 20 minutes?

A. 25 Bq

Correct B. 50 Bq

C. 75 Bq

D. 100 Bq

Correct Answer: B

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Question 5

A particle of mass 1 kg is moving in a circular path of radius 2 m with a speed of 4 m/s. What is the magnitude of the centripetal acceleration?

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 6

A gas is enclosed in a container with a movable piston. The gas is heated from 300 K to 400 K at cons\tant volume. What is the ratio of the final pressure to the initial pressure?

A. 2

B. 4

Correct C. 8

D. 16

Correct Answer: C

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Question 7

A radioactive sample has a half-life of 10 years. If the initial activity is 1000 Bq, what is the activity 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 convex lens has a focal length of 20 cm. What is the magnification of an object placed 30 cm in front of the lens?

Correct A. -0.5

B. -1

C. -2

D. -3

Correct Answer: A

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Question 9

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 2 m from its equilibrium position, what is the potential energy stored in the spring?

A. 100 J

B. 200 J

Correct C. 500 J

D. 1000 J

Correct Answer: C

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Question 10

A gas is enclosed in a container with a movable piston. The gas is compressed from an initial volume of 2 m^3 to a final volume of 1 m^3 at cons\tant temperature. What is the ratio of the final pressure to the initial pressure?

A. 2

B. 4

C. 8

Correct D. 16

Correct Answer: D

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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 experiences a centripetal acceleration of 2 m/s², what is the magnitude of the net force acting on the particle?

A. 12 N

Correct B. 16 N

C. 20 N

D. 24 N

Correct Answer: B

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Question 12

A 10 µF capacitor is connected in series with a 20 µF capacitor and a 50 µF resistor. If a 100 V battery is connected across the circuit, what is the magnitude of the current flowing through the circuit?

A. 0.2 A

B. 0.4 A

Correct C. 0.6 A

D. 0.8 A

Correct Answer: C

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Question 13

A wave has a frequency of 200 Hz and a wavelength of 0.5 m. If the wave is traveling in the positive x-direction, what is the magnitude of the wave number?

A. 400 m²/s

Correct B. 800 m²/s

C. 1200 m²/s

D. 1600 m²/s

Correct Answer: B

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Question 14

A 100 W light bulb is connected to a 120 V power source. If the light bulb is 90% efficient, what is the magnitude of the current flowing through the light bulb?

A. 0.8 A

Correct B. 1.2 A

C. 1.6 A

D. 2.0 A

Correct Answer: B

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Question 15

A gas is confined to a container with a volume of 2 L. If the temperature of the gas is increased from 300 K to 400 K, what is the magnitude of the change in the internal energy of the gas?

A. 100 J

B. 200 J

Correct C. 300 J

D. 400 J

Correct Answer: C

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Question 16

A thermodynamic system undergoes a cyclic process consisting of two isochoric processes and two isobaric processes. If the volume of the system increases by 20% during the first isochoric process, and the pressure decreases by 15% during the second isobaric process, what is the net change in internal energy of the system?

A. -10%

Correct B. 0%

C. 10%

D. 20%

Correct Answer: B

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Question 17

A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across the plates, what is the charge stored on the capacitor?

A. 200 μC

Correct B. 400 μC

C. 600 μC

D. 800 μC

Correct Answer: B

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Question 18

A magnetic field is produced by a current-carrying wire. If the current in the wire is increased by 50%, what is the new magnitude of the magnetic field?

A. 1.5 B

B. 2 B

Correct C. 2.5 B

D. 3 B

Correct Answer: C

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Question 19

A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 100 Bq, what is the activity after 20 years?

A. 25 Bq

Correct B. 50 Bq

C. 75 Bq

D. 100 Bq

Correct Answer: B

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Question 20

A gas is contained in a cylinder with a movable piston. If the pressure of the gas is increased by 20% and the volume is decreased by 15%, what is the new temperature of the gas?

A. 10°C

B. 20°C

Correct C. 30°C

D. 40°C

Correct Answer: C

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Question 21

A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8.0 x 10^-12 F, what is the charge on the plates when the potential difference between them is 100 V?

A. 4.0 x 10^-10 C

Correct B. 8.0 x 10^-10 C

C. 1.6 x 10^-9 C

D. 3.2 x 10^-9 C

Correct Answer: B

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Question 22

A radioactive sample decays from 100 g to 50 g in 10 years. What is the half-life of the sample?

A. 5 years

Correct B. 10 years

C. 15 years

D. 20 years

Correct Answer: B

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Question 23

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

A. 6 N

Correct B. 12 N

C. 18 N

D. 24 N

Correct Answer: B

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Question 24

A wave has a frequency of 50 Hz and a wavelength of 0.2 m. What is the speed of the wave?

A. 10 m/s

Correct B. 20 m/s

C. 30 m/s

D. 40 m/s

Correct Answer: B

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Question 25

A particle of mass 1 kg is moving in a straight line with a velocity of 5 m/s. What is the magnitude of the momentum of the particle?

A. 5 kg m/s

Correct B. 10 kg m/s

C. 15 kg m/s

D. 20 kg m/s

Correct Answer: B

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