POST UTME NOUN 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sound wave with a frequency of 200 Hz is emitted from a source moving towards a stationary observer. If the speed of sound in air is 343 m/s, calculate the apparent frequency heard by the observer.
A. 250 Hz
B. 220 Hz
C. 200 Hz
D. 180 Hz
Question 2
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 magnitude of the centripetal force?
A. 2 N
B. 4 N
C. 6 N
D. 8 N
Question 3
A 2.5 kg block of ice at 0°C is placed in a 10°C water bath. Assuming the specific heat capacity of ice is 2090 J/(kg·K) and the specific heat capacity of water is 4186 J/(kg·K), what is the time it takes for the ice to melt completely?
A. 10 minutes
B. 20 minutes
C. 30 minutes
D. 40 minutes
Question 4
A solid sphere of radius 5 cm is floating in a liquid of density 1.5 g/cm³. If the density of the sphere is 6 g/cm³, what is the depth of the sphere below the surface of the liquid?
A. 2.5 cm
B. 5 cm
C. 7.5 cm
D. 10 cm
Question 5
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 in the ground state \( $n=1$ \)?
A. 0
B. \frac{L}{2}
C. L
D. \frac{2L}{3}
Question 6
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?
A. 10 Ω
B. 12 Ω
C. 14 Ω
D. 16 Ω
Question 7
A beam of light is incident on a mirror at an angle of 30°. What is the angle of reflection?
A. 15°
B. 30°
C. 45°
D. 60°
Question 8
A light ray 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. 18°
B. 20°
C. 22°
D. 25°
Question 9
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 10
A parallel plate capacitor has a capaci\tance of $C$ and is charged to a potential difference of $V$. The plates are then separated by a dis\tance $d$. What is the energy stored in the capacitor?
A. \frac{1}{2} CV^2
B. \frac{1}{2} C\( V + d \)^2
C. \frac{1}{2} C\( V - d \)^2
D. \frac{1}{2} C\( V + d \)^2 + \frac{1}{2} Cd^2
Question 11
A particle of mass 2 kg is moving in a circular path with a cons\tant speed of 4 m/s. If the radius of the path is 3 m, calculate the magnitude of the centripetal force acting on the particle.
A. 12 N
B. 16 N
C. 20 N
D. 24 N
Question 12
A 2 kg block of metal is heated from 20°C to 80°C. If the specific heat capacity of the metal is 400 J/kg°C, calculate the energy transferred to the block.
A. 16000 J
B. 24000 J
C. 32000 J
D. 40000 J
Question 13
A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 100 Bq, what is the activity of the sample after 20 years?
A. 50 Bq
B. 25 Bq
C. 12.5 Bq
D. 6.25 Bq
Question 14
A particle of mass 3 kg is moving in a circular path of radius 2 m with a cons\tant speed of 6 m/s. If the particle is subjected to a centripetal force of 18 N, what is the magnitude of the acceleration of the particle?
A. 6 m/s^2
B. 8 m/s^2
C. 10 m/s^2
D. 12 m/s^2
Question 15
A lens of focal length 20 cm forms an image of an object at a dis\tance of 30 cm. What is the magnification of the lens?
A. 0.5
B. 1
C. 2
D. 3

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: