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POST UTME LASU 2022 Physics | Objective

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Question 1 View Details

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 magnetic field of strength 2 T, directed perp\endicular to the plane of the circular path, what is the magnitude of the magnetic force acting on the particle?

A. 8 N

B. 16 N

Correct C. 32 N

D. 64 N

Correct Answer: C

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Question 2 View Details

A 100 W light bulb is connected to a 220 V power source. If the bulb is 5% efficient, what is the resis\tance of the bulb?

Correct A. 10 Ω

B. 20 Ω

C. 30 Ω

D. 40 Ω

Correct Answer: A

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Question 3 View Details

A radioactive sample has a half-life of 5 years. If the initial activity of the sample is 1000 Bq, what is the activity of the sample after 10 years?

Correct A. 125 Bq

B. 250 Bq

C. 500 Bq

D. 1000 Bq

Correct Answer: A

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Question 4 View Details

A particle of mass 1 kg is moving in a straight line with a velocity of 5 m/s. If the particle is subjected to a force of 10 N, directed perp\endicular to the velocity, what is the acceleration of the particle?

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 5 View Details

A capacitor of capaci\tance 10 μF is connected to a 12 V power source. If the capacitor is initially uncharged, what is the charge on the capacitor after 5 seconds?

A. 0.12 C

Correct B. 0.24 C

C. 0.36 C

D. 0.48 C

Correct Answer: B

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Question 6 View Details

A nucleus of mass number 240 and atomic number 94 undergoes \alpha decay. What is the mass number and atomic number of the daughter nucleus?

Correct A. 234, 92

B. 238, 92

C. 236, 92

D. 240, 94

Correct Answer: A

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Question 7 View Details

A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 12 V is applied across it, what is the charge stored on the plates?

Correct A. 120 μC

B. 1200 μC

C. 12 μC

D. 1.2 μC

Correct Answer: A

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Question 8 View Details

A gas at a pressure of 2 atm and temperature of 300 K expands to a volume of 5 L. What is the final pressure of the gas?

Correct A. 0.4 atm

B. 0.8 atm

C. 1.2 atm

D. 1.6 atm

Correct Answer: A

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Question 9 View Details

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

Correct A. 18°

B. 20°

C. 22°

D. 25°

Correct Answer: A

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Question 10 View Details

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 centripetal 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 11 View Details

A gas is enclosed in a container with a movable piston. The gas is heated, cau\sing its pressure to increase. Which of the following statements is true about the change in the gas's volume?

A. The volume of the gas decreases

Correct B. The volume of the gas increases

C. The volume of the gas remains cons\tant

D. The volume of the gas decreases and then increases

Correct Answer: B

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Question 12 View Details

A point charge of +2 μC is placed at the origin of a coordinate system. A second point charge of -3 μC is placed at a dis\tance of 0.5 m from the origin. What is the magnitude of the electric field at a point 0.2 m from the origin?

A. 2.5 x 10^4 N/C

B. 5.0 x 10^4 N/C

Correct C. 7.5 x 10^4 N/C

D. 1.0 x 10^5 N/C

Correct Answer: C

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Question 13 View Details

A solid cylinder of radius 0.1 m and height 0.2 m has a mass of 0.5 kg. It is placed on a horizontal surface and a force of 10 N is applied \tangentially to its surface. What is the acceleration of the cylinder?

A. 0.5 m/s^2

B. 1.0 m/s^2

Correct C. 2.0 m/s^2

D. 5.0 m/s^2

Correct Answer: C

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Question 14 View Details

A resistor of 10 Ω and an inductor of 5 H are connected in series. A voltage of 20 V is applied across the circuit. What is the current in the circuit?

A. 0.5 A

B. 1.0 A

Correct C. 2.0 A

D. 4.0 A

Correct Answer: C

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Question 15 View Details

A particle of mass 0.5 kg is moving in a circular path with a radius of 0.2 m. The particle has a velocity of 2 m/s. What is the centripetal force acting on the particle?

A. 0.5 N

B. 1.0 N

Correct C. 2.0 N

D. 5.0 N

Correct Answer: C

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Question 16 View Details

A uniform magnetic field of 2 T is applied to a coil of wire with 100 turns and a radius of 0.05 m. If the coil is rotated at a frequency of 50 Hz, what is the maximum induced emf in the coil?

A. 0.5 V

Correct B. 1 V

C. 2 V

D. 5 V

Correct Answer: B

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Question 17 View Details

A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 5 V. If a dielectric material with a dielectric cons\tant of 2 is inserted between the plates, what is the new capaci\tance?

A. 20 μF

Correct B. 25 μF

C. 30 μF

D. 40 μF

Correct Answer: B

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Question 18 View Details

A block of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.1 m from its equilibrium position and released, what is the maximum kinetic energy of the block?

A. 0.1 J

B. 0.2 J

Correct C. 0.5 J

D. 1 J

Correct Answer: C

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Question 19 View Details

A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a voltage of 12 V is applied across the circuit, what is the current through the 10 Ω resistor?

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 20 View Details

A 5 μF capacitor is connected in parallel with a 10 μF capacitor. If a voltage of 10 V is applied across the circuit, what is the total capaci\tance?

A. 10 μF

B. 15 μF

Correct C. 20 μF

D. 25 μF

Correct Answer: C

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Question 21 View Details

A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?

A. 5 μF

B. 10 μF

C. 20 μF

Correct D. 40 μF

Correct Answer: D

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Question 22 View Details

A magnetic field of 0.5 T is applied to a coil of wire with 100 turns. If the coil is rotated by 90°, what is the induced emf?

A. 0.5 V

B. 1 V

Correct C. 2 V

D. 5 V

Correct Answer: C

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Question 23 View Details

A particle of mass 2 kg is attached to a spring with a spring cons\tant of 10 N/m. If the particle is displaced by 0.5 m from its equilibrium position, what is the resulting force?

A. 5 N

Correct B. 10 N

C. 20 N

D. 50 N

Correct Answer: B

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Question 24 View Details

A gas is contained in a cylinder with a volume of 10 L. If the temperature is increased by 20 K, what is the new volume?

A. 12 L

B. 15 L

Correct C. 20 L

D. 25 L

Correct Answer: C

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Question 25 View Details

A block of wood is floating in a \tank of water. If the block is displaced by 0.5 m, what is the resulting buoyant force?

A. 50 N

B. 100 N

Correct C. 200 N

D. 500 N

Correct Answer: C

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