POST UTME GREENFIELD UNIVERSITY 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. What is the centripetal force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 2
A simple harmonic motion has a maximum displacement of 2 m and a period of 4 s. What is the angular frequency?
A. 1.57 rad/s
B. 3.14 rad/s
C. 6.28 rad/s
D. 12.56 rad/s
Question 3
A particle of mass $m$ is moving in a circular orbit of radius $r$ under the influence of a central force given by $F(r) = -\frac{k}{r^2}$. If the particle's speed is $v$, what is its angular momentum $L$?
A. mv^2/r
B. mvr
C. mv^2r
D. mv^2/r^2
Question 4
A 10 μF capacitor is connected in series with a 50 Ω resistor and a 100 V battery. What is the time cons\tant of the circuit?
A. 0.5 s
B. 1 s
C. 2 s
D. 5 s
Question 5
A 10 μF capacitor is connected in series with a 20 Ω resistor and a 120 V power source. If the switch is closed at t = 0, what is the time cons\tant of the circuit?
A. 0.2 s
B. 0.4 s
C. 0.6 s
D. 0.8 s
Question 6
A radioactive sample has a half-life of 5 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 7
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. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 8
A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. What is the speed of the sound wave?
A. 100 m/s
B. 200 m/s
C. 300 m/s
D. 400 m/s
Question 9
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8.0 µF, what is the value of the dielectric cons\tant?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 10
A light beam is incident on a prism at an angle of 30°. If the re\fractive index of the prism is 1.5, calculate the angle of deviation.
A. 10°
B. 20°
C. 30°
D. 40°
Question 11
A capacitor consists of two parallel plates, each of area $A$ and separated by a dis\tance $d$. The plates are charged to a potential difference $V$. What is the capaci\tance $C$?
A. \frac{\epsilon_0 A}{d}
B. \frac{\epsilon_0 A}{V}
C. \frac{V}{\epsilon_0 A}
D. \frac{d}{\epsilon_0 A}
Question 12
A block of mass 5 kg is attached to a spring with spring cons\tant 200 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, determine the maximum kinetic energy of the block.
A. 0.5 J
B. 1 J
C. 1.5 J
D. 2 J
Question 13
A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, calculate the activity after 20 years.
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 14
A sound wave with frequency 200 Hz and amplitude 0.05 m is traveling through a medium with speed 340 m/s. If the wave is reflected off a rigid boundary, determine the intensity of the reflected wave.
A. 0.1 W/m^2
B. 0.2 W/m^2
C. 0.3 W/m^2
D. 0.4 W/m^2
Question 15
A ray 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. 10°
B. 20°
C. 30°
D. 40°

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