POST UTME GREENFIELD UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A car travels from point A to point B with an average speed of 60 km/h. On the return trip, the car travels with an average speed of 40 km/h. What is the average speed of the car for the entire trip?
A. 45 km/h
B. 50 km/h
C. 55 km/h
D. 60 km/h
Question 2
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 m
B. 15 m
C. 20 m
D. 25 m
Question 3
A container of volume $V$ contains an ideal gas at temperature $T$. If the gas is heated to a temperature $2T$, what is the new volume?
A. 2V
B. V
C. \frac{V}{2}
D. \frac{V}{3}
Question 4
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. 10 cm
C. -5 cm
D. 5 cm
Question 5
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance.
A. 0.01 F
B. 0.02 F
C. 0.03 F
D. 0.04 F
Question 6
A gas at 300 K and 1 atm is compressed to 2 atm. What is the new volume?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 7
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 8
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 9
A photon of energy 2 eV is incident on a metal surface with a work function of 1.5 eV. What is the maximum kinetic energy of the emitted electron?
A. 0.5 eV
B. 1.0 eV
C. 1.5 eV
D. 2.0 eV
Question 10
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 11
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 12
A parallel beam of light of wavelength 500 nm is incident on a glass slab 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 circuit consists of a 12 Ω resistor and a 20 Ω resistor connected in parallel. If a voltage of 24 V is applied across the circuit, what is the current flowing through the 12 Ω resistor?
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 14
A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 100 Bq, calculate the activity of the sample after 20 years.
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 15
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

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