POST UTME GREENFIELD UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
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 3
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 4
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
Question 5
A particle of mass $m$ is moving in a circular orbit of radius $r$ with speed $v$. If the particle is subject to a centripetal force $F_c = \frac{mv^2}{r}$, what is the magnitude of the acceleration of the particle?
A. \( \frac{mv^2}{r^2} \)
B. \( \frac{mv^2}{r} \)
C. \( \frac{m}{r^2} \)
D. \( \frac{m}{r} \)
Question 6
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 7
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 8
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the maximum height reached by the projectile?
A. 10.0 m
B. 12.5 m
C. 15.0 m
D. 17.5 m
Question 9
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 10
A particle of mass $m$ is confined to a one-dimensional box of length $L$. The ground-state wave function of the particle is given by \( psi_0\( x \ \) = \sqrt{\frac{2}{L}} \sinleft\( \frac{pi x}{L}\right \)). What is the expectation value of the position operator in this state?
A. \( \frac{L}{2} \)
B. \( \frac{L}{pi} \)
C. (L)
D. (0)
Question 11
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the circuit?
A. 1.5 A
B. 2.0 A
C. 2.5 A
D. 3.0 A
Question 12
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 m/s^2
B. 12 m/s^2
C. 15 m/s^2
D. 20 m/s^2
Question 13
A simple harmonic motion has a maximum displacement of 0.05 m and a period of 2 seconds. What is its angular frequency?
A. 3.14 rad/s
B. 6.28 rad/s
C. 9.42 rad/s
D. 12.57 rad/s
Question 14
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 15
A sound wave with a frequency of 200 Hz has a wavelength of 1.5 m. What is the speed of the sound wave?
A. 300 m/s
B. 400 m/s
C. 500 m/s
D. 600 m/s

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