Exam Body

Year

Subject

Paper Type

POST UTME UNIOSUN 2018 Physics | Objective

Are you preparing for POST UTME UNIOSUN exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance.

A. 2.5 x 10^-10 F

Correct B. 5.0 x 10^-10 F

C. 1.0 x 10^-9 F

D. 2.0 x 10^-9 F

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 2

A current of 2 A flows through a resistor of 10 ohms. Calculate the power dissipated in the resistor.

A. 20 W

Correct B. 40 W

C. 60 W

D. 80 W

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 3

A gas at 300 K expands from 1 L to 2 L against a cons\tant external pressure of 1 atm. Calculate the work done by the gas.

Correct A. -1.0 x 10^-3 J

B. -2.0 x 10^-3 J

C. -3.0 x 10^-3 J

D. -4.0 x 10^-3 J

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 4

A nucleus of mass number 238 and atomic number 92 undergoes \alpha decay. Calculate the energy released in the process.

A. 5.0 x 10^-12 J

B. 1.0 x 10^-11 J

Correct C. 2.0 x 10^-11 J

D. 3.0 x 10^-11 J

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 5

A \sinusoidal voltage of peak value 100 V and frequency 50 Hz is applied across a circuit. Calculate the rms value of the voltage.

Correct A. 70.7 V

B. 71.1 V

C. 71.4 V

D. 71.7 V

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 6

A gas is enclosed in a container of volume 2.5 m³ at a temperature of 300 K. If the temperature is increased to 450 K, what is the new volume of the gas, assuming ideal gas behavior?

A. 3.5 m³

Correct B. 4.5 m³

C. 5.5 m³

D. 6.5 m³

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 7

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the total resis\tance of the circuit?

A. 8 Ω

B. 10 Ω

Correct C. 12 Ω

D. 14 Ω

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 8

A particle is projected at an angle of 60° to the horizontal with an initial velocity of 25 m/s. What is the time of flight of the particle?

A. 2 s

Correct B. 3 s

C. 4 s

D. 5 s

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 9

A photon has an energy of 4.8 eV. What is its wavelength?

A. 250 nm

B. 300 nm

Correct C. 350 nm

D. 400 nm

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 10

A heat engine operates between a source at 500 K and a \sink at 300 K. What is the maximum efficiency of the engine?

A. 0.25

B. 0.30

Correct C. 0.35

D. 0.40

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 11

A gas is enclosed in a container with a movable piston. The gas is heated at cons\tant volume. Which of the following statements is true?

Correct A. The pressure of the gas increases.

B. The pressure of the gas decreases.

C. The pressure of the gas remains cons\tant.

D. The pressure of the gas becomes zero.

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 12

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

A. 2 m/s

B. 4 m/s

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 13

A radioactive sample has a half-life of 5 years. If the initial activity of the sample is 100 Bq, what is the activity of the sample after 10 years?

Correct A. 12.5 Bq

B. 25 Bq

C. 50 Bq

D. 100 Bq

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 14

A wire of resis\tance 10 Ω is connected in series with a 20 Ω resistor and a 30 Ω resistor. What is the total resis\tance of the circuit?

A. 40 Ω

B. 50 Ω

Correct C. 60 Ω

D. 70 Ω

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 15

A spring has a force cons\tant of 100 N/m. If a 2 kg block is attached to the spring and displaced by 0.2 m from its equilibrium position, what is the potential energy stored in the spring?

A. 20 J

Correct B. 40 J

C. 60 J

D. 80 J

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 16

A radioactive sample of uranium-238 undergoes \alpha decay. If the initial mass of the sample is 100 g, what is the mass of the daughter nucleus after 3 half-lives?

A. 25 g

B. 50 g

Correct C. 12.5 g

D. 75 g

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 17

A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. What is the equivalent resis\tance of the circuit?

A. 50 Ω

Correct B. 60 Ω

C. 70 Ω

D. 80 Ω

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 18

A heat engine operates between a high-temperature reservoir at 500 K and a low-temperature reservoir at 300 K. If the engine produces 100 J of work per cycle, what is the efficiency of the engine?

A. 0.25

Correct B. 0.30

C. 0.35

D. 0.40

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 19

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

A. 16 N

B. 20 N

Correct C. 24 N

D. 28 N

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 20

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

A. 0.45 A

Correct B. 0.50 A

C. 0.55 A

D. 0.60 A

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 21

A parallel plate capacitor with plates of area 0.04 m^2 and separation 0.02 m is connected to a 12 V battery. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance of the capacitor.

A. 0.02 F

B. 0.04 F

Correct C. 0.06 F

D. 0.08 F

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 22

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 displaced by 2 m from its initial position, calculate the work done by the force acting on the particle.

A. -16 J

B. -8 J

Correct C. 0 J

D. 8 J

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 23

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

Correct A. 20°

B. 30°

C. 40°

D. 50°

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 24

A 10 μF capacitor is charged to a potential difference of 12 V. If the capacitor is then connected to a 5 Ω resistor, calculate the time cons\tant of the circuit.

A. 0.1 s

Correct B. 0.2 s

C. 0.5 s

D. 1 s

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Question 25

A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. If the particle is displaced by 1 m from its initial position, calculate the work done by the force acting on the particle.

A. -6 J

B. -3 J

Correct C. 0 J

D. 3 J

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows

Help others prepare! Share this practice hub:

Chat with Support