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POST UTME CALEB UNIVERSITY 2020 Physics | Objective

Are you preparing for POST UTME CALEB UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

A radioactive sample of Δₗ emits Δₗα particles with a half-life of 5.27 years. If the initial activity is 1.0 µCi, what is the activity after 10.54 years?

Correct A. 0.125 µCi

B. 0.25 µCi

C. 0.5 µCi

D. 1.0 µCi

Correct Answer: A

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Question 2

A gas at 300 K and 1 atm expands to 2 atm. What is the new temperature in Kelvin?

A. 300 K

Correct B. 400 K

C. 600 K

D. 800 K

Correct Answer: B

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Question 3

A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. What is the maximum height reached by the projectile?

A. 10 m

B. 20 m

Correct C. 30 m

D. 40 m

Correct Answer: C

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Question 4

A convex lens of focal length 20 cm forms an image of an object at a dis\tance of 30 cm. What is the magnification of the lens?

A. -1

Correct B. -0.5

C. 0.5

D. 1

Correct Answer: B

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Question 5

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?

A. 20°

B. 30°

Correct C. 40°

D. 50°

Correct Answer: C

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Question 6

A block of mass 2 kg 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.

A. 2 m/s

Correct B. 4 m/s

C. 6 m/s

D. 8 m/s

Correct Answer: B

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Question 7

A parallel plate capacitor consists of two plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. The space between the plates is filled with a dielectric material of dielectric cons\tant 2. The capacitor is connected to a battery of emf 10 V. 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 8

A current of 5 A flows through a resistor of resis\tance 10 ohms. Calculate the power dissipated by the resistor.

Correct A. 25 W

B. 50 W

C. 75 W

D. 100 W

Correct Answer: A

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Question 9

A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 4 m/s. Calculate the magnitude of the force acting on the particle.

A. 8 N

Correct B. 16 N

C. 24 N

D. 32 N

Correct Answer: B

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Question 10

A magnetic field of strength 0.5 T is directed perp\endicular to the plane of a circular loop of radius 0.1 m. Calculate the magnetic flux through the loop.

Correct A. 0.01 Wb

B. 0.02 Wb

C. 0.03 Wb

D. 0.04 Wb

Correct Answer: A

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Question 11

A gas is heated at cons\tant volume. If the initial temperature is 300 K and the final temperature is 500 K, calculate the ratio of the final pressure to the initial pressure.

Correct A. 1.67

B. 2.00

C. 3.33

D. 4.00

Correct Answer: A

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Question 12

A particle moves in a circular path with a cons\tant speed of 5 m/s. If the radius of the circle is 2 m, calculate the magnitude of the acceleration of the particle.

A. 1.25 m/s^2

B. 2.50 m/s^2

Correct C. 5.00 m/s^2

D. 10.00 m/s^2

Correct Answer: C

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Question 13

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. If the current in the circuit is 1 A, calculate the potential difference across the 6 Ω resistor.

A. 6 V

Correct B. 8 V

C. 10 V

D. 12 V

Correct Answer: B

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Question 14

A beam of light passes from air into a glass 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

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Question 15

A simple harmonic motion has a maximum displacement of 2 m and a period of 4 s. If the initial displacement is 1 m, calculate the velocity at time t = 2 s.

A. 1.33 m/s

Correct B. 2.00 m/s

C. 2.67 m/s

D. 3.33 m/s

Correct Answer: B

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Question 16

A monochromatic light source of wavelength 500 nm is incident on a double-slit apparatus. The dis\tance between the slits is 0.5 mm. If the screen is placed 1 m away from the slits, what is the dis\tance between the central maximum and the first minimum?

A. 1.5 mm

Correct B. 2.5 mm

C. 3.5 mm

D. 4.5 mm

Correct Answer: B

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Question 17

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

A. 10 N

B. 20 N

Correct C. 30 N

D. 40 N

Correct Answer: C

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Question 18

A container of volume 0.5 m^3 is filled with a gas at a pressure of 2 atm. If the temperature is increased by 20 K, what is the new pressure?

A. 2.5 atm

Correct B. 3.5 atm

C. 4.5 atm

D. 5.5 atm

Correct Answer: B

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Question 19

A light ray passes through a prism of angle 30° and is re\fracted at an angle of 20°. What is the angle of deviation?

A. 10°

Correct B. 20°

C. 30°

D. 40°

Correct Answer: B

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Question 20

A body of mass 5 kg is moving in a straight line with an initial velocity of 10 m/s. If it experiences a cons\tant acceleration of 2 m/s^2, what is its velocity after 5 seconds?

A. 25 m/s

B. 30 m/s

Correct C. 35 m/s

D. 40 m/s

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 dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance.

A. 1.0 x 10^-9 F

B. 2.0 x 10^-9 F

Correct C. 3.0 x 10^-9 F

D. 4.0 x 10^-9 F

Correct Answer: C

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Question 22

A gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the temperature is increased to 300 K, what is the new volume?

A. 3.0 L

Correct B. 3.5 L

C. 4.0 L

D. 4.5 L

Correct Answer: B

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Question 23

A particle moves in a circular path with a radius of 2 m. If the particle completes one revolution in 4 s, what is its angular velocity?

A. 0.5 rad/s

B. 1.0 rad/s

Correct C. 1.5 rad/s

D. 2.0 rad/s

Correct Answer: C

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Question 24

A simple harmonic motion has an amplitude of 5 m and a frequency of 2 Hz. If the particle is at its equilibrium position at t = 0, what is its position at t = 1 s?

A. -5 m

B. -2 m

Correct C. 2 m

D. 5 m

Correct Answer: C

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Question 25

A vector has a magnitude of 3 m and makes an angle of 60° with the x-axis. If it is projected onto the y-axis, what is its magnitude?

A. 1.5 m

Correct B. 2.0 m

C. 2.5 m

D. 3.0 m

Correct Answer: B

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