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POST UTME NILE UNIVERSITY 2017 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 2017 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1

A beam of light is incident on a glass slab at an angle of 60°. If the re\fractive index of glass is 1.5, calculate the angle of re\fraction.

A. 30°

Correct B. 45°

C. 60°

D. 75°

Correct Answer: B

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Question 2

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 3

A wave has a frequency of 200 Hz and a wavelength of 0.5 m. Calculate the speed of the wave.

A. 100 m/s

Correct B. 200 m/s

C. 300 m/s

D. 400 m/s

Correct Answer: B

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Question 4

A body of mass 5 kg is moving with a velocity of 10 m/s. Calculate the kinetic energy of the body.

A. 250 J

Correct B. 500 J

C. 750 J

D. 1000 J

Correct Answer: B

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Question 5

A light ray is incident on a prism at an angle of 30°. If the re\fractive index of the prism is 1.5, calculate the angle of deviation.

A. 10°

B. 20°

Correct C. 30°

D. 40°

Correct Answer: C

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Question 6

A gas at 300 K is heated to 400 K. If the initial volume is 2.5 L, what is the final volume if the gas is ideal and the temperature change is isothermal?

A. 2.5 L

Correct B. 5.0 L

C. 10.0 L

D. 15.0 L

Correct Answer: B

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Question 7

A particle of mass 0.5 kg is moving with an initial velocity of 5 m/s. If it experiences a cons\tant force of 10 N, what is its acceleration?

A. 2 m/s^2

B. 5 m/s^2

Correct C. 10 m/s^2

D. 20 m/s^2

Correct Answer: C

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Question 8

A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. If a 12 V battery is connected across the circuit, what is the current through the 10 Ω resistor?

A. 0.4 A

B. 0.8 A

Correct C. 1.2 A

D. 1.6 A

Correct Answer: C

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Question 9

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?

A. 1.25 eV

B. 2.5 eV

Correct C. 3.75 eV

D. 5.0 eV

Correct Answer: C

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Question 10

A thermodynamic system is in equilibrium at 300 K. If 100 J of heat is added to the system, what is the change in entropy?

A. 0.3 J/K

B. 0.6 J/K

Correct C. 1.0 J/K

D. 1.5 J/K

Correct Answer: C

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Question 11

A uniform magnetic field of magnitude 2 T is directed along the z-axis. A current of 5 A flows through a wire loop of radius 0.1 m placed in the x-y plane. Calculate the magnitude of the magnetic moment of the loop.

A. 0.1 A m^2

B. 0.5 A m^2

Correct C. 1 A m^2

D. 5 A m^2

Correct Answer: C

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Question 12

A sound wave with frequency 200 Hz and amplitude 0.01 m is traveling through a medium with speed 343 m/s. Calculate the wavelength of the wave.

Correct A. 1.71 m

B. 1.72 m

C. 1.73 m

D. 1.74 m

Correct Answer: A

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Question 13

A block of mass 5 kg is attached to a spring with spring cons\tant 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Calculate the maximum speed of the block.

A. 1.58 m/s

B. 1.59 m/s

Correct C. 1.60 m/s

D. 1.61 m/s

Correct Answer: C

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Question 14

A vector A has magnitude 3 m and direction 30° north of east. A vector B has magnitude 4 m and direction 60° south of west. Calculate the magnitude of the resul\tant vector A + B.

A. 5.39 m

B. 5.40 m

Correct C. 5.41 m

D. 5.42 m

Correct Answer: C

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Question 15

A particle is moving in a circular path with radius 2 m and period 4 s. Calculate the magnitude of the centripetal acceleration.

A. 1.59 m/s^2

B. 1.60 m/s^2

Correct C. 1.61 m/s^2

D. 1.62 m/s^2

Correct Answer: C

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Question 16

A particle of mass $m$ is moving in a circular orbit of radius $R$ around a fixed point $O$. If the particle's speed is $v$, what is the magnitude of the centripetal force acting on it?

Correct A. $ \frac{mv^2}{R} $

B. $ \frac{mv^2}{R^2} $

C. $ \frac{mv^2}{R^3} $

D. $ \frac{mv^2}{R^4} $

Correct Answer: A

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Question 17

A 2.0 mH inductor is connected in series with a 3.0 kΩ resistor and a 9.0 V battery. If the switch is closed at $t=0$, what is the current in the circuit at $t=0.10$ s?

A. ( 0.10 A )

B. ( 0.20 A )

Correct C. ( 0.30 A )

D. ( 0.40 A )

Correct Answer: C

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Question 18

A block of mass $m$ is attached to a horizontal, massless spring with force cons\tant $k$. If the block is displaced by a dis\tance $x$ from its equilibrium position and released from rest, what is the angular frequency of the resulting simple harmonic motion?

Correct A. $ \sqrt{\frac{k}{m}} $

B. $ \frac{k}{m} $

C. $ \frac{m}{k} $

D. $ \frac{1}{\sqrt{km}} $

Correct Answer: A

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Question 19

A particle of mass $m$ is moving in a circular orbit of radius $R$ around a fixed point $O$. If the particle's speed is $v$, what is the magnitude of the centripetal acceleration acting on it?

Correct A. $ \frac{v^2}{R} $

B. $ \frac{v^2}{R^2} $

C. $ \frac{v^2}{R^3} $

D. $ \frac{v^2}{R^4} $

Correct Answer: A

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Question 20

A 4.0 μF capacitor is connected in series with a 2.0 kΩ resistor and a 12 V battery. If the switch is closed at $t=0$, what is the charge on the capacitor at $t=0.20$ s?

A. ( 0.20 , mu C )

B. ( 0.40 , mu C )

Correct C. ( 0.60 , mu C )

D. ( 0.80 , mu C )

Correct Answer: C

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Question 21

A 2.5 mH inductor is connected in series with a 10 Ω resistor and a 20 V battery. If the initial current is 0 A, find the current after 0.1 s.

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 22

A 5 μF capacitor is connected in parallel with a 10 kΩ resistor. If the voltage across the capacitor is 100 V, find the charge on the capacitor.

A. 0.5 μC

Correct B. 1.0 μC

C. 1.5 μC

D. 2.0 μC

Correct Answer: B

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Question 23

A 10 mH inductor is connected in series with a 20 Ω resistor and a 50 V battery. If the initial current is 0 A, find the current after 0.05 s.

A. 1.0 A

Correct B. 1.5 A

C. 2.0 A

D. 2.5 A

Correct Answer: B

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Question 24

A 2.5 μF capacitor is connected in parallel with a 5 kΩ resistor. If the voltage across the capacitor is 50 V, find the charge on the capacitor.

A. 0.25 μC

Correct B. 0.5 μC

C. 0.75 μC

D. 1.0 μC

Correct Answer: B

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Question 25

A 10 Ω resistor is connected in series with a 20 V battery. If the current is 0.5 A, find the power dissipated by the resistor.

A. 5 W

Correct B. 10 W

C. 15 W

D. 20 W

Correct Answer: B

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