POST UTME PAN-ATLANTIC UNIVERSITY 2018 Physics | Objective

Are you preparing for POST UTME PAN-ATLANTIC UNIVERSITY 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.

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Question 1
A gas is enclosed in a container at a pressure of 2.5 atm. If the temperature is increased by 20°C, what is the new pressure of the gas, assuming the volume remains cons\tant?
A. 3.0 atm
Correct B. 3.5 atm
C. 4.0 atm
D. 4.5 atm

Correct Answer: B

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Question 2
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the circuit?
A. 1.5 A
Correct B. 2.0 A
C. 2.5 A
D. 3.0 A

Correct Answer: B

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Question 3
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 0.2 m from its equilibrium position and released, what is the maximum speed of the block?
A. 2.0 m/s
B. 2.5 m/s
Correct C. 3.0 m/s
D. 3.5 m/s

Correct Answer: C

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Question 4
A ray of light passes from air into a glass block with a re\fractive index of 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 5
A lens with a focal length of 20 cm is used to form an image of an object placed 30 cm away. 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 6
A radioactive sample of Uranium-238 undergoes \alpha decay, emitting an \alpha particle. If the initial mass of the sample is 200 g, and the mass of the \alpha particle is 4 u, what is the mass of the resulting nucleus?
Correct A. 234 u
B. 238 u
C. 242 u
D. 246 u

Correct Answer: A

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Question 7
A sound wave with a frequency of 200 Hz is emitted from a source and reflected off a stationary wall. If the speed of sound in air is 343 m/s, what is the wavelength of the reflected sound wave?
Correct A. 1.7 m
B. 1.9 m
C. 2.1 m
D. 2.3 m

Correct Answer: A

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Question 8
A beam of light passes through a prism and is re\fracted. If the angle of incidence is 30° and the angle of re\fraction is 20°, what is the angle of deviation?
A. 10°
B. 15°
Correct C. 20°
D. 25°

Correct Answer: C

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Question 9
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. If the current through the circuit is 2 A, what is the voltage across the 6 Ω resistor?
A. 8 V
Correct B. 10 V
C. 12 V
D. 14 V

Correct Answer: B

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Question 10
A beam of light passes through a convex lens and is focused. If the focal length of the lens is 20 cm and the object dis\tance is 30 cm, what is the image dis\tance?
A. 10 cm
B. 15 cm
Correct C. 20 cm
D. 25 cm

Correct Answer: C

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Question 11
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. It is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the maximum speed of the particle.
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 12
A heat engine operates between two temperatures, 500 K and 300 K. If the engine absorbs 1000 J of heat from the high-temperature reservoir, what is the efficiency of the engine?
A. 0.25
B. 0.30
Correct C. 0.35
D. 0.40

Correct Answer: C

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Question 13
A block of mass 5 kg is moving with a velocity of 10 m/s on a frictionless surface. It collides with a stationary block of mass 10 kg. What is the velocity of the combined blocks after the collision?
A. 2 m/s
B. 4 m/s
Correct C. 6 m/s
D. 8 m/s

Correct Answer: C

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Question 14
A ray of light passes from air into a glass block with a re\fractive index of 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 15
A 60 Hz AC generator produces a voltage of 120 V. If the current is 10 A, what is the power consumed by the generator?
A. 1200 W
B. 1500 W
Correct C. 1800 W
D. 2000 W

Correct Answer: C

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Question 16
A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the maximum speed of the block as it passes through the equilibrium position.
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 17
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 capaci\tance of the capacitor is 10 nF. If a potential difference of 10 V is applied across the plates, calculate the energy stored in the capacitor.
Correct A. 0.1 J
B. 1 J
C. 10 J
D. 100 J

Correct Answer: A

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Question 18
A radioactive sample decays from 100 g to 50 g in 10 years. Assuming the decay is exponential, calculate the half-life of the sample.
A. 5 years
Correct B. 10 years
C. 20 years
D. 30 years

Correct Answer: B

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Question 19
A magnetic field of 0.1 T is applied to a current-carrying wire of length 1 m. If the current in the wire is 2 A, calculate the force exerted on the wire.
Correct A. 0.2 N
B. 0.4 N
C. 0.6 N
D. 0.8 N

Correct Answer: A

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Question 20
A particle of mass 1 kg is moving in a circular path of radius 0.5 m with a speed of 2 m/s. Calculate the centripetal force acting on the particle.
Correct A. 2 N
B. 4 N
C. 6 N
D. 8 N

Correct Answer: A

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Question 21
A beam of light is incident on a glass slab at an angle of 30°. If the re\fractive index of the glass is 1.5, calculate the angle of re\fraction.
A. 20°
Correct B. 25°
C. 30°
D. 35°

Correct Answer: B

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Question 22
A particle of mass 2 kg is moving in a circular path with a cons\tant speed of 4 m/s. If the radius of the path is 3 m, calculate the centripetal 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 23
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. Calculate the current flowing through the circuit.
A. 1 A
B. 1.5 A
Correct C. 2 A
D. 2.5 A

Correct Answer: C

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Question 24
A gas is heated from 20°C to 50°C at cons\tant pressure. Calculate the change in volume.
A. 10 cm³
B. 15 cm³
Correct C. 20 cm³
D. 25 cm³

Correct Answer: C

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Question 25
A sound wave has a frequency of 200 Hz and a wavelength of 2 m. Calculate the speed of the sound wave.
A. 400 m/s
B. 500 m/s
Correct C. 600 m/s
D. 700 m/s

Correct Answer: C

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