POST UTME NOUN 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A light ray passes from air into a glass slab of re\fractive index 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 2
A heat engine operates between two temperatures $T_1$ and $T_2$. What is the efficiency of the engine?
A. 1 - \frac{T_2}{T_1}
B. \frac{T_2}{T_1}
C. \frac{T_1}{T_2}
D. 1 + \frac{T_2}{T_1}
Question 3
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If the dis\tance between the plates is doubled, what is the new potential difference?
A. 10 V
B. 20 V
C. 30 V
D. 40 V
Question 4
A parallel plate capacitor with plates of area 0.04 m^2 and separation 0.02 m is connected to a 12 V battery. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance and the energy stored in the capacitor.
A. 0.0012 F
B. 0.0024 F
C. 0.0036 F
D. 0.0048 F
Question 5
A heat engine operates between a source at 500 K and a \sink at 300 K. If the engine has an efficiency of 30%, what is the temperature of the source?
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 6
A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?
A. 50 Bq
B. 25 Bq
C. 12.5 Bq
D. 6.25 Bq
Question 7
A photon of energy 2 eV is incident on a metal surface with a work function of 1 eV. If the photon is absorbed, what is the maximum kinetic energy of the emitted electron?
A. 0.5 eV
B. 1 eV
C. 1.5 eV
D. 2 eV
Question 8
A simple harmonic motion is described by the equation $x(t) = A \cos\( omega t + phi \)$, where $A$ is the amplitude, $omega$ is the angular frequency, and $phi$ is the phase angle. What is the period of the motion?
A. 2πA/ω
B. 2πA^2/ω
C. 2π/ω
D. 2πA/ω^2
Question 9
A ray of light passes from air into 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. 25°
C. 30°
D. 35°
Question 10
A particle of mass $m$ is confined to a one-dimensional box of length $L$. The wave function of the particle is given by $psi(x) = \sqrt{\frac{2}{L}} \sinleft\( \frac{npi x}{L}\right \)$, where $n$ is a positive integer. What is the expectation value of the position of the particle?
A. 0
B. L/2
C. L
D. nπL/2
Question 11
A radioactive subs\tance has a half-life of 5 years. If 100 g of the subs\tance is initially present, how much of the subs\tance will remain after 20 years?
A. 12.5 g
B. 25 g
C. 50 g
D. 100 g
Question 12
A 100 V, 10 A AC source is connected to a 50 Ω resistor. What is the power consumed by the resistor?
A. 500 W
B. 250 W
C. 125 W
D. 62.5 W
Question 13
A wave has a frequency of 50 Hz and a wavelength of 0.2 m. What is the speed of the wave?
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 14
A work function is given by the equation $W = W_0 + kE^2$, where $W_0$ is the minimum work function and $k$ is a cons\tant. What is the energy of the electron emitted when the energy of the incident photon is $E = 2E_0$?
A. E_0
B. 2E_0
C. 3E_0
D. 4E_0
Question 15
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. If air resis\tance is neglected, what is the maximum height reached by the projectile?
A. 5 m
B. 10 m
C. 15 m
D. 20 m

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: