POST UTME COAL CITY UNIVERSITY 2024 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A body is heated from 20°C to 80°C. What is the change in temperature?
A. 60°C
B. 40°C
C. 80°C
D. 20°C
Question 2
A gas is contained in a cylinder of volume 2.0 L at a pressure of 1.0 atm. If the temperature is increased by 10°C, what is the new pressure of the gas?
A. 1.2 atm
B. 1.5 atm
C. 2.0 atm
D. 2.5 atm
Question 3
A gas is compressed isothermally from an initial volume V_i to a final volume V_f. What is the work done W on the gas?
A. nRT \ln\left\( \frac{V_f}{V_i}\right \)
B. nRT \ln\left\( \frac{V_i}{V_f}\right \)
C. nRT \left\( \frac{V_f}{V_i}\right \)
D. nRT \left\( \frac{V_i}{V_f}\right \)
Question 4
A sound wave with a frequency of 500 Hz is produced by a source moving away from a stationary observer. If the speed of sound in air is 343 m/s, calculate the apparent frequency heard by the observer.
A. 400 Hz
B. 420 Hz
C. 440 Hz
D. 460 Hz
Question 5
A block of mass 5 kg is attached to a horizontal 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 from rest, calculate the maximum speed of the block.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 6
A particle moves in a circular path with a radius of 2 m and a speed of 4 m/s. What is the centripetal acceleration of the particle?
A. 0.5 m/s^2
B. 1 m/s^2
C. 2 m/s^2
D. 4 m/s^2
Question 7
A radioactive sample emits \alpha particles with a half-life of 5 days. If the initial activity is 100 Bq, what is the activity after 10 days?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 8
A gas is contained in a cylinder of volume 1.0 L at a pressure of 2.0 atm. If the temperature is increased by 20°C, what is the new pressure of the gas?
A. 2.5 atm
B. 3.0 atm
C. 3.5 atm
D. 4.0 atm
Question 9
A gas is heated from 300 K to 400 K at cons\tant volume. Calculate the change in internal energy of the gas.
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 10
A lens of focal length 20 cm is used to form an image of an object placed 30 cm away from the lens. Calculate the magnification of the lens.
A. 0.5
B. 1
C. 1.5
D. 2
Question 11
A convex lens with a focal length of 20 cm is used to form an image of an object. If the object dis\tance is 30 cm, what is the image dis\tance?
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
Question 12
A particle of mass 2 kg is moving in a circular path of radius 5 m with a speed of 10 m/s. What is the magnitude of the centripetal force acting on the particle?
A. 20 N
B. 40 N
C. 60 N
D. 80 N
Question 13
A beam of light passes through a prism and is re\fracted at an angle of 30°. If the angle of incidence is 20°, what is the angle of re\fraction?
A. 20°
B. 30°
C. 40°
D. 50°
Question 14
A thermodynamic system undergoes a process from state A to state B. If the system's internal energy increases by 100 J and the work done on the system is 50 J, what is the change in the system's entropy?
A. 0.5 J/K
B. 1 J/K
C. 2 J/K
D. 5 J/K
Question 15
A unit of length is defined as 0.01 m. If a length is measured to be 0.05 m, what is the number of units?
A. 1 unit
B. 2 units
C. 5 units
D. 10 units

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