POST UTME COAL CITY UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 100 V, 2 A current source is connected to a 50 Ω resistor. What is the power dissipated in the resistor?
A. 50 W
B. 100 W
C. 200 W
D. 250 W
Question 2
A heat engine operates between the temperatures 500 K and 300 K. If the engine absorbs 1000 J of heat energy, calculate its efficiency.
A. \( \frac{1000}{500} \)
B. \( \frac{1000}{300} \)
C. \( \frac{1000}{200} \)
D. \( \frac{1000}{100} \)
Question 3
A sound wave with a frequency of 200 Hz and a speed of 340 m/s is traveling through a medium. Calculate the wavelength of the sound wave.
A. 0.5 m
B. 1 m
C. 1.5 m
D. 2 m
Question 4
A 5.0 g sample of a radioactive subs\tance decays to 2.5 g in 10 days. Calculate the half-life of the subs\tance.
A. 5 days
B. 10 days
C. 15 days
D. 20 days
Question 5
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 2 A, what is the voltage across the 6 Ω resistor?
A. 6 V
B. 8 V
C. 10 V
D. 12 V
Question 6
A circuit consists of a 12 V battery, a 4 Ω resistor, and an unknown resistor. The current in the circuit is 2 A. What is the value of the unknown resistor?
A. 2 Ω
B. 4 Ω
C. 6 Ω
D. 8 Ω
Question 7
A parallel plate capacitor consists of two plates, each of area 0.04 m^2, separated by a dis\tance of 0.02 m. The capacitor is charged to a potential difference of 10 V. Calculate the capaci\tance of the capacitor.
A. 0.02 F
B. 0.04 F
C. 0.06 F
D. 0.08 F
Question 8
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
C. 24 N
D. 32 N
Question 9
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. If the acceleration due to gravity is 9.8 m/s^2, what is the maximum height reached by the projectile?
A. 5 m
B. 10 m
C. 15 m
D. 20 m
Question 10
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 centripetal acceleration of the particle?
A. 12 m/s^2
B. 16 m/s^2
C. 20 m/s^2
D. 24 m/s^2
Question 11
A nucleus of mass number 240 and atomic number 92 undergoes \alpha decay. If the daughter nucleus has a mass number of 236 and an atomic number of 90, what is the energy released in the decay?
A. 1.0 MeV
B. 2.0 MeV
C. 3.0 MeV
D. 4.0 MeV
Question 12
A body of mass 2.0 kg is moving with a velocity of 5.0 m/s. If the body is subjected to a force of 10 N, calculate the acceleration of the body.
A. 1.0 m/s^2
B. 2.0 m/s^2
C. 3.0 m/s^2
D. 4.0 m/s^2
Question 13
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. 15 m
C. 20 m
D. 25 m
Question 14
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 block undergoes simple harmonic motion, calculate the maximum speed of the block as it passes through the equilibrium position.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 15
A 100 W light bulb is connected to a 220 V AC source. Calculate the current flowing through the bulb.
A. \( \frac{100}{220} \) A
B. \( \frac{100}{200} \) A
C. \( \frac{100}{150} \) A
D. \( \frac{100}{50} \) A

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