POST UTME GREENFIELD UNIVERSITY 2018 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 cons\tant speed of 4 m/s. Calculate the magnitude of the centripetal force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 2
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial pressure is 2 atm, what is the final pressure?
A. 3 atm
B. 4 atm
C. 5 atm
D. 6 atm
Question 3
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. 6 m/s^2
B. 12 m/s^2
C. 18 m/s^2
D. 24 m/s^2
Question 4
A liquid of density 800 kg/m³ is flowing through a horizontal pipe of radius 0.1 m. If the pressure difference between the two \ends of the pipe is 1000 Pa, calculate the volume flow rate.
A. 0.01 m³/s
B. 0.02 m³/s
C. 0.03 m³/s
D. 0.04 m³/s
Question 5
A block of mass 5 kg is attached to a horizontal, massless spring with a spring cons\tant of 200 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, 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 of mass $m$ is moving in a circular orbit of radius $r$ under the influence of a magnetic field of strength $B$. If the particle's speed is $v$, what is the magnitude of the magnetic field?
A. \frac{mv}{qr}
B. \frac{mv^2}{qr}
C. \frac{m}{qr}
D. \frac{v}{qr}
Question 7
A radioactive sample emits \alpha, \beta, and \gamma radiation. If the half-life of the sample is 5 days, and it decays to 1/16 of its original amount in 20 days, what is the decay cons\tant?
A. 0.1389 day^-1
B. 0.1399 day^-1
C. 0.1399 day^-1
D. 0.1389 day^-1
Question 8
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. 14 Ω
D. 16 Ω
Question 9
A wave of frequency $f$ and wavelength $\lambda$ is traveling through a medium. If the wave is reflected from a surface, what is the frequency of the reflected wave?
A. f
B. 2f
C. \frac{f}{2}
D. \frac{f}{3}
Question 10
A body of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, calculate the acceleration produced.
A. 2 m/s²
B. 4 m/s²
C. 6 m/s²
D. 8 m/s²
Question 11
A point charge of 2 µC is placed at the origin. What is the electric potential at a point 10 cm away?
A. 100 V
B. 200 V
C. 300 V
D. 400 V
Question 12
A ray of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.
A. 20°
B. 30°
C. 40°
D. 50°
Question 13
A parallel plate capacitor has a capaci\tance of 5 μF. If a potential difference of 10 V is applied across the plates, what is the charge stored on the capacitor?
A. 50 μC
B. 60 μC
C. 70 μC
D. 80 μC
Question 14
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle has a speed of 4 m/s, what is the centripetal acceleration?
A. 1.33 m/s^2
B. 1.67 m/s^2
C. 2.00 m/s^2
D. 2.33 m/s^2
Question 15
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. What is the focal length of the combination?
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm

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