POST UTME DELSU 2018 Physics | Objective

Are you preparing for POST UTME DELSU 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 particle of mass 2 kg is attached to a spring with spring cons\tant 100 N/m. It is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the maximum kinetic energy of the particle.
A. 0.5 J
B. 1.0 J
Correct C. 1.25 J
D. 1.5 J

Correct Answer: C

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Question 2
A radioactive sample decays by a first-order process with a half-life of 10 minutes. If the initial activity is 100 Bq, calculate the activity after 30 minutes.
A. 20 Bq
B. 30 Bq
Correct C. 40 Bq
D. 50 Bq

Correct Answer: C

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Question 3
A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a 12 V battery is connected across the circuit, calculate the current flowing through the 20 Ω resistor.
A. 0.2 A
Correct B. 0.3 A
C. 0.4 A
D. 0.5 A

Correct Answer: B

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Question 4
A photon of wavelength 500 nm is incident on a metal surface. If the work function of the metal is 2.5 eV, calculate the maximum kinetic energy of the emitted electron.
A. 1.25 eV
B. 1.5 eV
Correct C. 1.75 eV
D. 2.0 eV

Correct Answer: C

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Question 5
A 100 W bulb is connected to a 220 V mains supply. Calculate the current flowing through 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 6
A thermodynamic system undergoes a process from state A to state B. If the system's internal energy is 100 J at state A and 120 J at state B, and the work done by the system is 20 J, what is the heat transfer into the system?
Correct A. 80 J
B. 120 J
C. 100 J
D. 140 J

Correct Answer: A

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Question 7
A gas is confined to a cylinder with a movable piston. The gas is heated, cau\sing the piston to move. If the initial pressure is 100 kPa and the final pressure is 150 kPa, and the volume of the gas is 2 m^3, what is the work done by the gas?
A. 300 J
Correct B. 400 J
C. 500 J
D. 600 J

Correct Answer: B

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Question 8
A magnetic field is produced by a current-carrying wire. If the current is 2 A and the length of the wire is 1 m, what is the magnetic field strength at a dis\tance of 0.5 m from the wire?
A. 0.1 T
Correct B. 0.2 T
C. 0.3 T
D. 0.4 T

Correct Answer: B

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Question 9
A vector has a magnitude of 5 m and makes an angle of 30° with the x-axis. What is the y-component of the vector?
Correct A. 2.5 m
B. 3.5 m
C. 4.5 m
D. 5.5 m

Correct Answer: A

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Question 10
A system is in equilibrium under the action of three forces. If the first force has a magnitude of 10 N and the second force has a magnitude of 15 N, and the third force has a magnitude of 20 N, what is the net force acting on the system?
Correct A. 0 N
B. 5 N
C. 10 N
D. 15 N

Correct Answer: A

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Question 11
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 centripetal acceleration of 2 m/s², what is the magnitude of the force acting on the particle?
A. 10 N
B. 12 N
Correct C. 15 N
D. 18 N

Correct Answer: C

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Question 12
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. What is the focal length of the combination?
A. -5 cm
Correct B. -10 cm
C. -20 cm
D. -30 cm

Correct Answer: B

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Question 13
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°
Correct B. 25°
C. 30°
D. 35°

Correct Answer: B

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Question 14
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 subjected to a centripetal acceleration of 1 m/s², what is the magnitude of the force acting on the particle?
A. 6 N
B. 8 N
Correct C. 10 N
D. 12 N

Correct Answer: C

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Question 15
A concave lens of focal length -20 cm is placed in contact with a convex lens of focal length 15 cm. What is the focal length of the combination?
A. -5 cm
B. -10 cm
Correct C. -15 cm
D. -20 cm

Correct Answer: C

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Question 16
A block of mass 2.5 kg is susp\ended from a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, what is the maximum speed of the block?
A. 2.5 m/s
Correct B. 5.0 m/s
C. 10.0 m/s
D. 15.0 m/s

Correct Answer: B

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Question 17
A radioactive sample has a half-life of 5 years. If the initial activity is 1000 Bq, what is the activity after 10 years?
A. 125 Bq
B. 250 Bq
Correct C. 500 Bq
D. 1000 Bq

Correct Answer: C

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Question 18
A convex lens has a focal length of 20 cm. If an object is placed 30 cm in front of the lens, what is the magnification of the image?
A. -1
Correct B. -0.5
C. 0.5
D. 1

Correct Answer: B

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Question 19
A gas is confined to a cylinder of volume 2 m^3 at a temperature of 300 K. If the temperature is increased to 400 K, what is the new volume of the gas?
A. 2.5 m^3
B. 3.0 m^3
Correct C. 3.5 m^3
D. 4.0 m^3

Correct Answer: C

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Question 20
A particle of mass 1 kg is moving in a circular path of radius 2 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 21
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. The capaci\tance is 2.5 nF. Calculate the charge stored when the potential difference between the plates is 10 V.
A. 0.1 C
Correct B. 0.2 C
C. 0.3 C
D. 0.4 C

Correct Answer: B

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Question 22
A particle of mass 0.1 kg is attached to a spring with spring cons\tant 10 N/m. The particle is displaced by 0.05 m from its equilibrium position and released from rest. Calculate the frequency of oscillation.
A. 0.5 Hz
Correct B. 1 Hz
C. 2 Hz
D. 5 Hz

Correct Answer: B

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Question 23
A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, calculate the activity after 20 years.
A. 10 Bq
B. 20 Bq
Correct C. 50 Bq
D. 100 Bq

Correct Answer: C

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Question 24
A gas is enclosed in a container of volume 0.1 m^3. The pressure is 10^5 Pa and the temperature is 300 K. Calculate the number of moles of gas present.
A. 0.01 mol
Correct B. 0.02 mol
C. 0.03 mol
D. 0.04 mol

Correct Answer: B

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Question 25
A beam of light is incident on a prism at an angle of 30°. The re\fractive index of the prism is 1.5. Calculate the angle of re\fraction.
A. 20°
B. 30°
Correct C. 40°
D. 50°

Correct Answer: C

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