POST UTME CRAWFORD UNIVERSITY 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A thermodynamic system undergoes a process from state A to state B. If the initial temperature is 300 K and the final temperature is 400 K, calculate the change in entropy u\sing the formula ΔS = Q / T.
A. 10 J/K
B. 20 J/K
C. 30 J/K
D. 40 J/K
Question 2
A particle of mass 0.1 kg is moving in a circular path with a radius of 0.2 m. If the particle's velocity is 5 m/s, what is the magnitude of the centripetal force acting on the particle?
A. 0.5 N
B. 1 N
C. 2 N
D. 3 N
Question 3
A beam of light is incident on a glass surface at an angle of 45°. If the re\fractive index of glass is 1.5, calculate the angle of re\fraction u\sing Snell's law.
A. 30°
B. 45°
C. 60°
D. 75°
Question 4
A capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 5 V. If the capacitor is connected to a resistor with a resis\tance of 100 Ω, what is the time cons\tant of the circuit?
A. 0.1 s
B. 0.5 s
C. 1.0 s
D. 2.0 s
Question 5
A 5.0 kg block is moving at a speed of 2.0 m/s on a horizontal surface. If the coefficient of kinetic friction is 0.20, what is the force of friction?
A. 10 N
B. 10 N
C. 10 N
D. 10 N
Question 6
A beam of light is incident on a convex lens with a focal length of 20 cm. If the object dis\tance is 30 cm, calculate the image dis\tance u\sing the lens equation.
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
Question 7
A gas expands from 1 L to 2 L against a cons\tant external pressure of 2 atm. Calculate the work done by the gas.
A. 4 J
B. 8 J
C. 16 J
D. 32 J
Question 8
A particle is moving in a circular path with a radius of 5 m. If the angular velocity is 2 rad/s, calculate the linear velocity u\sing the formula v = rω.
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 9
A heat engine operates between two temperatures, T1 = 500 K and T2 = 300 K. If the engine produces 1000 J of work, what is the efficiency of the engine?
A. 0.2
B. 0.3
C. 0.4
D. 0.5
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. If the particle is subjected to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 11
A 100 Hz tuning fork is placed near a 200 Hz tuning fork. What is the beat frequency?
A. 100 Hz
B. 100 Hz
C. 100 Hz
D. 100 Hz
Question 12
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 10 V. If a dielectric material with a dielectric cons\tant of 2 is inserted between the plates, what is the new capaci\tance?
A. 20 μF
B. 30 μF
C. 40 μF
D. 50 μF
Question 13
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the total resis\tance of the circuit?
A. 10 Ω
B. 12 Ω
C. 16 Ω
D. 20 Ω
Question 14
A charged particle moves in a uniform magnetic field. If the particle has a charge of +2e and a velocity of 3 × 10^6 m/s, what is the radius of the circular path?
A. 1.5 m
B. 3 m
C. 4.5 m
D. 6 m
Question 15
A sound wave with a frequency of 200 Hz has a speed of 343 m/s. What is the wavelength of the sound wave?
A. 1.715 m
B. 1.715 cm
C. 1.715 mm
D. 1.715 μm

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