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POST UTME MADONNA UNIVERSITY 2017 Physics | Objective

Are you preparing for POST UTME MADONNA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1

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. What is the magnitude of the force acting on the particle?

A. 12 N

Correct B. 16 N

C. 20 N

D. 24 N

Correct Answer: B

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Question 2

A light ray passes from air into a glass slab 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 3

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 4

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. What is the magnitude of the force acting on the particle?

A. 6 N

B. 9 N

Correct C. 12 N

D. 15 N

Correct Answer: C

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Question 5

A light ray passes from a glass slab of re\fractive index 1.5 into air. If the angle of incidence is 40°, what is the angle of re\fraction?

A. 30°

B. 35°

C. 40°

Correct D. 45°

Correct Answer: D

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Question 6

A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. It is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the maximum speed of the particle.

A. 1 m/s

Correct B. 2 m/s

C. 3 m/s

D. 4 m/s

Correct Answer: B

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Question 7

A 200 V AC supply is connected to a circuit containing a 50 Ω resistor and a 20 μF capacitor in series. Calculate the impedance of the circuit and the phase angle between the voltage and current.

Correct A. 60 Ω, 45°

B. 50 Ω, 30°

C. 55 Ω, 40°

D. 65 Ω, 50°

Correct Answer: A

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Question 8

A heat engine operates between two temperatures of 500 K and 300 K. If the engine produces 100 kJ of work per cycle, calculate the efficiency of the engine.

A. 20%

Correct B. 30%

C. 40%

D. 50%

Correct Answer: B

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Question 9

A block of mass 5 kg is susp\ended from a spring with a spring cons\tant of 200 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, calculate the time period of the oscillations.

A. 1 s

Correct B. 2 s

C. 3 s

D. 4 s

Correct Answer: B

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Question 10

A magnetic field of 0.5 T is applied to a coil of 100 turns and a resis\tance of 10 Ω. If the coil is connected to a 200 V AC supply, calculate the current in the coil.

A. 20 A

Correct B. 30 A

C. 40 A

D. 50 A

Correct Answer: B

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Question 11

A uniform magnetic field of 2 T is applied to a coil of wire with 50 turns. If the coil is rotated by 90° in 0.1 s, calculate the induced emf u\sing Faraday's law of induction.

A. 0.5 V

Correct B. 1.0 V

C. 2.0 V

D. 5.0 V

Correct Answer: B

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Question 12

A radioactive sample decays from 100 mg to 50 mg in 10 days. If the half-life of the sample is 20 days, calculate the decay cons\tant (λ) u\sing the formula: λ = ln(2)/t1/2.

A. 0.05 d^-1

Correct B. 0.10 d^-1

C. 0.15 d^-1

D. 0.20 d^-1

Correct Answer: B

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Question 13

A convex lens of focal length 20 cm is placed in a beam of light. If the object dis\tance is 30 cm, calculate the image dis\tance u\sing the lens equation: 1/f = 1/do + 1/di.

A. 10 cm

B. 20 cm

Correct C. 30 cm

D. 40 cm

Correct Answer: C

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Question 14

A circuit consists of a 10 Ω resistor and a 20 Ω resistor connected in parallel. If a 12 V battery is connected across the circuit, calculate the total current u\sing Kirchhoff's current law.

A. 0.5 A

Correct B. 1.0 A

C. 2.0 A

D. 3.0 A

Correct Answer: B

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Question 15

A beam of light passes through a prism and is re\fracted at an angle of 30°. If the angle of incidence is 20°, calculate the angle of re\fraction u\sing Snell's law: n1 \sin(θ1) = n2 \sin(θ2).

A. 20°

B. 30°

Correct C. 40°

D. 50°

Correct Answer: C

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Question 16

A 2.5 V battery is connected in series with a 5 ohm resistor and a 10 ohm resistor. If the current through the 5 ohm resistor is 0.5 A, what is the current through the 10 ohm resistor?

A. 0.25 A

B. 0.5 A

Correct C. 0.75 A

D. 1 A

Correct Answer: C

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Question 17

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. What is the magnitude of the 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 18

A photon of wavelength 400 nm is incident on a metal surface. If the work function of the metal is 2.5 eV, what is the maximum kinetic energy of the emitted electron?

A. 1.25 eV

B. 2.5 eV

Correct C. 3.75 eV

D. 5 eV

Correct Answer: C

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Question 19

A gas is enclosed in a container of volume 2 L at a pressure of 1 atm. If the temperature is increased by 10 K, what is the new pressure?

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 20

A block of mass 5 kg is moving on a frictionless surface with a speed of 2 m/s. If a force of 10 N is applied perp\endicular to the motion, what is the new speed?

A. 2.5 m/s

B. 3 m/s

Correct C. 3.5 m/s

D. 4 m/s

Correct Answer: C

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Question 21

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 force of 12 N, what is the angular velocity of the particle?

A. 2 rad/s

Correct B. 4 rad/s

C. 6 rad/s

D. 8 rad/s

Correct Answer: B

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Question 22

A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If the air resis\tance is negligible, what is the maximum height reached by the projectile?

A. 10 m

B. 15 m

Correct C. 20 m

D. 25 m

Correct Answer: C

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Question 23

A circuit consists of a 12 Ω resistor, a 20 Ω resistor, and a 10 Ω resistor connected in series. If a voltage of 24 V is applied across the circuit, what is the current flowing through the circuit?

A. 0.5 A

Correct B. 1 A

C. 1.5 A

D. 2 A

Correct Answer: B

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Question 24

A capacitor consists of two parallel plates separated by a dis\tance of 2 mm. If a charge of 10 μC is placed on one plate, what is the potential difference between the plates?

A. 5 V

Correct B. 10 V

C. 15 V

D. 20 V

Correct Answer: B

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Question 25

A current of 5 A flows through a resistor of 10 Ω for 2 seconds. What is the energy dissipated by the resistor?

A. 50 J

B. 100 J

Correct C. 150 J

D. 200 J

Correct Answer: C

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