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POST UTME UNIPORT 2021 Physics | Objective

Are you preparing for POST UTME UNIPORT exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1

A 2.5 V battery is connected in series with a 5 ohm resistor and a 10 ohm resistor. What is the total resis\tance in the circuit?

A. 15 ohms

B. 20 ohms

Correct C. 25 ohms

D. 30 ohms

Correct Answer: C

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Question 2

A body of mass 5 kg is moving with a velocity of 10 m/s. What is its kinetic energy?

A. 50 J

Correct B. 100 J

C. 150 J

D. 200 J

Correct Answer: B

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Question 3

A 100 W bulb is connected to a 220 V power supply. 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 heat engine operates between the temperatures 300 K and 600 K. What is its efficiency?

A. 20%

B. 30%

Correct C. 40%

D. 50%

Correct Answer: C

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Question 5

A magnetic field of 0.5 T is applied to a coil of 100 turns. What is the induced emf?

A. 0.5 V

Correct B. 1 V

C. 2 V

D. 5 V

Correct Answer: B

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Question 6

A light wave of wavelength 500 nm is incident on a glass surface with a re\fractive index of 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?

Correct A. 20°

B. 30°

C. 40°

D. 50°

Correct Answer: A

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Question 7

A capacitor of capaci\tance 10 μF is connected in series with a resistor of resis\tance 100 Ω. If a voltage of 20 V is applied across the circuit, what is 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 8

A sound wave of frequency 200 Hz is emitted from a source moving at a speed of 10 m/s. If the observer is stationary, what is the apparent frequency heard by the observer?

A. 180 Hz

B. 200 Hz

Correct C. 220 Hz

D. 240 Hz

Correct Answer: C

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Question 9

A light wave of wavelength 600 nm is incident on a glass surface with a re\fractive index of 1.5. If the angle of incidence is 45°, what is the angle of re\fraction?

A. 20°

Correct B. 30°

C. 40°

D. 50°

Correct Answer: B

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Question 10

A capacitor of capaci\tance 20 μF is connected in parallel with a resistor of resis\tance 50 Ω. If a voltage of 30 V is applied across the circuit, what is the current flowing through the circuit?

A. 0.6 A

B. 0.8 A

C. 1.0 A

Correct D. 1.2 A

Correct Answer: D

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Question 11

A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, calculate the maximum speed of the block as it passes through the equilibrium position.

A. 2.5 m/s

Correct B. 5.0 m/s

C. 7.5 m/s

D. 10.0 m/s

Correct Answer: B

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Question 12

A parallel plate capacitor consists of two plates, each of area 0.04 m^2, separated by a dis\tance of 0.02 m. The capacitor is connected to a 12 V battery. Calculate the capaci\tance of the capacitor.

A. 0.01 F

Correct B. 0.02 F

C. 0.03 F

D. 0.04 F

Correct Answer: B

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Question 13

A 500 g block of ice at 0°C is placed in a 1000 g block of water at 80°C. Assuming no heat is lost to the surroundings, calculate the final temperature of the system.

A. 10°C

B. 20°C

Correct C. 30°C

D. 40°C

Correct Answer: C

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Question 14

A 5 kg object is moving in a circular path with a cons\tant speed of 10 m/s. The radius of the circle is 2 m. Calculate the magnitude of the centripetal acceleration of the object.

A. 5 m/s^2

Correct B. 10 m/s^2

C. 15 m/s^2

D. 20 m/s^2

Correct Answer: B

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Question 15

A sound wave with a frequency of 200 Hz and a wavelength of 0.5 m is traveling through a medium. Calculate the speed of the sound 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 16

A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. If the particle is subject to a centripetal force $F_c = \frac{mv^2}{r}$, what is the magnitude of the acceleration of the particle?

A. \frac{v^2}{r}

B. \frac{mv^2}{r^2}

Correct C. \frac{mv^2}{r}

D. \frac{v^2}{r^2}

Correct Answer: C

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Question 17

A block of mass $m$ is placed on a frictionless surface and connected to a spring with a spring cons\tant $k$. If the block is displaced by a dis\tance $x$ and released, what is the magnitude of the acceleration of the block?

Correct A. \frac{kx}{m}

B. \frac{mx}{k}

C. \frac{k}{m}

D. \frac{m}{k}

Correct Answer: A

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Question 18

A parallel plate capacitor has a capaci\tance of $C$ and is charged to a potential difference of $V$. If the dis\tance between the plates is increased by a factor of $n$, what is the new capaci\tance?

Correct A. \frac{C}{n}

B. \frac{nC}{V}

C. \frac{CV}{n}

D. \frac{V}{nC}

Correct Answer: A

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Question 19

A coil of wire is placed in a magnetic field and rotated at a frequency of $f$. If the coil has a resis\tance of $R$ and an induc\tance of $L$, what is the magnitude of the current in the coil?

Correct A. \frac{V}{R}

B. \frac{V}{R^2}

C. \frac{V}{R^3}

D. \frac{V}{R^4}

Correct Answer: A

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Question 20

A ray of light passes through a prism and is re\fracted at an angle of $\theta$. If the angle of incidence is $\alpha$ and the angle of emergence is $\beta$, what is the magnitude of the deviation?

Correct A. \theta + \alpha - \beta

B. \theta - \alpha + \beta

C. \theta + \beta - \alpha

D. \theta - \beta + \alpha

Correct Answer: A

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Question 21

A 2.0 mH inductor is connected in series with a 10 V AC source. If the frequency of the source is 50 Hz, what is the inductive reac\tance of the circuit?

A. 10 Ω

Correct B. 20 Ω

C. 50 Ω

D. 100 Ω

Correct Answer: B

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Question 22

A particle of mass 0.5 kg is projected from the origin with an initial velocity of 20 m/s at an angle of 60° to the horizontal. Find the time of flight of the particle.

A. 2 s

B. 4 s

Correct C. 6 s

D. 8 s

Correct Answer: C

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Question 23

A nucleus of mass number 238 has an atomic number of 92. What is the mass defect of the nucleus?

A. 0.1 u

B. 0.5 u

Correct C. 1.0 u

D. 5.0 u

Correct Answer: C

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Question 24

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

A. 100 J

B. 200 J

Correct C. 500 J

D. 1000 J

Correct Answer: C

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Question 25

A point charge of 2 μC is placed at the origin. What is the electric potential at a point 0.5 m away from the charge?

A. 100 V

B. 200 V

Correct C. 500 V

D. 1000 V

Correct Answer: C

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