POST UTME SUMMIT UNIVERSITY 2025 Physics | Objective

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Question 1 View Details
A radioactive sample of Δₗ has a half-life of 5.27 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 50 Bq
B. 25 Bq
Correct C. 12.5 Bq
D. 6.25 Bq

Correct Answer: C

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Question 2 View Details
A particle of mass 2.0 kg is moving in a circular path of radius 3.0 m with a cons\tant speed of 4.0 m/s. What is the magnitude of the centripetal acceleration?
A. 0.50 m/s²
B. 1.0 m/s²
Correct C. 2.0 m/s²
D. 4.0 m/s²

Correct Answer: C

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Question 3 View Details
A 5.0 µF capacitor is connected in series with a 10.0 µF capacitor and a 15.0 µF capacitor. What is the equivalent capaci\tance?
A. 20.0 µF
B. 30.0 µF
Correct C. 40.0 µF
D. 50.0 µF

Correct Answer: C

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Question 4 View Details
A 2.0 kg object is moving in a circular path of radius 4.0 m with a cons\tant speed of 5.0 m/s. What is the magnitude of the centripetal force?
A. 10.0 N
B. 20.0 N
Correct C. 30.0 N
D. 40.0 N

Correct Answer: C

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Question 5 View Details
A 3.0 µF capacitor is connected in parallel with a 6.0 µF capacitor. What is the equivalent capaci\tance?
A. 4.0 µF
B. 6.0 µF
Correct C. 8.0 µF
D. 9.0 µF

Correct Answer: C

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Question 6 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 gas?
Correct A. The gas expands to occupy a larger volume.
B. The gas contracts to occupy a smaller volume.
C. The gas remains at the same volume.
D. The gas changes phase from gas to liquid.

Correct Answer: A

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Question 7 View Details
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle experiences a centripetal force of 10 N, what is its angular velocity?
A. 5 rad/s
Correct B. 10 rad/s
C. 20 rad/s
D. 50 rad/s

Correct Answer: B

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Question 8 View Details
A light ray 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?
Correct A. 20°
B. 30°
C. 40°
D. 50°

Correct Answer: A

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Question 9 View Details
A spring with a spring cons\tant of 100 N/m is stretched by 2 m. What is the work done in stretching the spring?
A. 200 J
Correct B. 400 J
C. 600 J
D. 800 J

Correct Answer: B

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Question 10 View Details
A block of mass 5 kg is placed on a frictionless surface. A force of 20 N is applied to the block, cau\sing it to accelerate. What is the acceleration of the block?
A. 2 m/s²
Correct B. 4 m/s²
C. 6 m/s²
D. 8 m/s²

Correct Answer: B

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Question 11 View Details
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. The capaci\tance is 2.5 nF. If the potential difference between the plates is increased to 10 V, what is the new charge on the plates?
A. 6.25 μC
Correct B. 12.5 μC
C. 25 μC
D. 50 μC

Correct Answer: B

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Question 12 View Details
A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?
Correct A. 25 Bq
B. 50 Bq
C. 100 Bq
D. 200 Bq

Correct Answer: A

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Question 13 View Details
A magnetic field of 0.5 T is applied to a coil of 100 turns and radius 0.1 m. If the current in the coil is 2 A, what is the induced emf?
A. 0.1 V
Correct B. 0.5 V
C. 1 V
D. 2 V

Correct Answer: B

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Question 14 View Details
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. 20°
Correct C. 30°
D. 40°

Correct Answer: C

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Question 15 View Details
A 100 Ω resistor is connected in series with a 50 Ω resistor and a 20 Ω resistor. If a 10 V battery is connected across the circuit, what is the current in the 100 Ω resistor?
A. 0.1 A
B. 0.2 A
Correct C. 0.3 A
D. 0.4 A

Correct Answer: C

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Question 16 View Details
A particle of mass 2 kg is moving in a circular orbit of radius 3 m under the influence of a central force given by ( F(r) = \frac{k}{r^2} ), where k is a cons\tant. If the particle's speed is 4 m/s, what is its angular momentum?
A. 12 kg m^2/s
B. 24 kg m^2/s
Correct C. 36 kg m^2/s
D. 48 kg m^2/s

Correct Answer: C

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Question 17 View Details
A wave has a frequency of 200 Hz and a wavelength of 0.5 m. What is its speed?
A. 100 m/s
Correct B. 200 m/s
C. 300 m/s
D. 400 m/s

Correct Answer: B

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Question 18 View Details
A simple harmonic motion has a maximum displacement of 2 m and a period of 4 s. What is its angular frequency?
A. 0.5 rad/s
Correct B. 1 rad/s
C. 1.5 rad/s
D. 2 rad/s

Correct Answer: B

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Question 19 View Details
A gas has a volume of 2 m^3 at a temperature of 300 K. If the temperature is increased to 400 K, what is the new volume?
A. 2.67 m^3
Correct B. 3.33 m^3
C. 4 m^3
D. 4.67 m^3

Correct Answer: B

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Question 20 View Details
A magnetic field has a strength of 0.5 T and a direction perp\endicular to the plane of a circular loop of radius 0.2 m. What is the magnetic moment of the loop?
A. 0.01 A m^2
Correct B. 0.02 A m^2
C. 0.03 A m^2
D. 0.04 A m^2

Correct Answer: B

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Question 21 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 centripetal acceleration of 2 m/s^2, what is the magnitude of the 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 22 View Details
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 2 m from its equilibrium position and released from rest. What is the maximum speed of the block as it oscillates?
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 23 View Details
A 10 V battery is connected to a 2 Ω resistor and a 4 Ω resistor in series. What is the current flowing through the circuit?
A. 2 A
Correct B. 4 A
C. 6 A
D. 8 A

Correct Answer: B

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Question 24 View Details
A gas is contained in a cylinder of volume 2 L at a pressure of 1 atm. If the temperature is increased by 10°C, what is the new pressure of the gas?
A. 1.1 atm
B. 1.2 atm
Correct C. 1.3 atm
D. 1.4 atm

Correct Answer: C

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Question 25 View Details
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° 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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