POST UTME GREENFIELD UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If a potential difference of 10 V is applied across the plates, calculate the capaci\tance.
A. 2.5 x 10^-11 F
B. 2.5 x 10^-12 F
C. 2.5 x 10^-13 F
D. 2.5 x 10^-14 F
Question 2
A sound wave with frequency $f = 200,mathrm{Hz}$ and amplitude $A = 0.5,mathrm{m}$ is traveling through a medium with speed $v = 340,mathrm{m/s}$. What is the wavelength of the sound wave?
A. $1.7,mathrm{m}$
B. $1.8,mathrm{m}$
C. $1.9,mathrm{m}$
D. $2.0,mathrm{m}$
Question 3
A 100 µF temperature change is observed in a thermodynamic system. If the initial temperature is 300 K, what is the change in entropy?
A. -0.10 kJ/K
B. -0.20 kJ/K
C. -0.30 kJ/K
D. -0.40 kJ/K
Question 4
A gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the pressure is increased to 3.0 atm, what is the new volume of the gas?
A. 1.67 L
B. 2.33 L
C. 3.33 L
D. 4.67 L
Question 5
A particle moves in a circular path with a radius of 0.1 m. If it completes one revolution in 2 seconds, what is its angular velocity?
A. 10 rad/s
B. 20 rad/s
C. 30 rad/s
D. 40 rad/s
Question 6
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. 10.0 m
B. 12.0 m
C. 14.0 m
D. 16.0 m
Question 7
A circuit consists of a $10,Omega$ resistor, a $20,Omega$ resistor, and a $5,Omega$ resistor connected in series. If a voltage of $12,mathrm{V}$ is applied across the circuit, what is the current through the $5,Omega$ resistor?
A. $0.4,mathrm{A}$
B. $0.6,mathrm{A}$
C. $0.8,mathrm{A}$
D. $1.0,mathrm{A}$
Question 8
A point charge of +2.0 µC is placed at the origin. A second point charge of -3.0 µC is placed at a dis\tance of 0.20 m from the origin. What is the electric potential at a point 0.10 m from the origin?
A. -1.5 × 10³ V
B. -2.0 × 10³ V
C. -2.5 × 10³ V
D. -3.0 × 10³ V
Question 9
A gas expands from an initial volume of 2 L to a final volume of 5 L. If the initial pressure is 2 atm, what is the final pressure?
A. 1 atm
B. 2 atm
C. 3 atm
D. 4 atm
Question 10
A 100 V, 10 A current is passed through a capacitor of 10^-6 F for 10 seconds. What is the energy stored in the capacitor?
A. 10^-3 J
B. 10^-2 J
C. 10^-1 J
D. 1 J
Question 11
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. 16 m/s^2
B. 12 m/s^2
C. 8 m/s^2
D. 20 m/s^2
Question 12
A capacitor of capaci\tance 10 μF is charged to a potential difference of 12 V. What is the energy stored in the capacitor?
A. 0.72 J
B. 1.08 J
C. 1.44 J
D. 1.80 J
Question 13
A ray of light 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?
A. 20°
B. 30°
C. 40°
D. 50°
Question 14
A heat engine operates between the temperatures 300 K and 600 K. If the efficiency of the engine is 30%, what is the work done by the engine per cycle?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 15
A wave has a frequency of 50 Hz and a wavelength of 0.1 m. What is its speed?
A. 5 m/s
B. 50 m/s
C. 500 m/s
D. 5000 m/s

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