POST UTME UNN 2024 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A ray of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, determine the angle of re\fraction.
A. 20°
B. 30°
C. 40°
D. 50°
Question 2
A particle is moving in a circular path with a radius of 2 m. If the particle has a mass of 0.5 kg and is moving with a speed of 4 m/s, what is the magnitude of the centripetal force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 3
A 1000 Hz AC voltage source is connected to a 50 Ω resistor. If the maximum voltage is 100 V, calculate the root mean square (RMS) value of the current.
A. 2 A
B. 4 A
C. 5 A
D. 10 A
Question 4
A body of mass 5 kg is moving with a velocity of 10 m/s. If the body is subjected to a force of 20 N, what is the acceleration of the body?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 5
A capacitor consists of two parallel plates, each of area 0.01 m^2, separated by a dis\tance of 0.001 m. If the capaci\tance is 10 nF, calculate the charge stored on each plate when a potential difference of 10 V is applied across the capacitor.
A. 0.1 C
B. 0.2 C
C. 0.3 C
D. 0.4 C
Question 6
A heat engine operates between two temperatures of 500 K and 300 K. If the engine has an efficiency of 30%, what is the temperature of the hot reservoir?
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 7
A simple harmonic oscillator has a frequency $f$ and amplitude $A$. What is the maximum speed of the oscillator?
A. Af
B. Af^2
C. Af^2/A
D. Af^2/A^2
Question 8
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.5 m from its equilibrium position and released from rest, calculate the maximum velocity of the particle.
A. 1 m/s
B. 2 m/s
C. 5 m/s
D. 10 m/s
Question 9
A particle of mass $m$ is moving in a circular orbit of radius $r$ with a speed $v$. What is the magnitude of the centripetal force?
A. mv^2/r
B. mv^2/r^2
C. m^2v^2/r
D. m^2v^2/r^2
Question 10
A sound wave with a frequency of 200 Hz has a speed of 340 m/s. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2.0 m
Question 11
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
Question 12
A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a 12 V DC source is connected across the circuit, what is the current flowing through the 10 Ω resistor?
A. 0.4 A
B. 0.6 A
C. 0.8 A
D. 1.0 A
Question 13
A sound wave with a frequency of 200 Hz is produced by 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. 220 Hz
B. 240 Hz
C. 260 Hz
D. 280 Hz
Question 14
A radioactive sample of Uranium-238 undergoes \alpha decay. If the initial mass of the sample is 100 g, and the mass of the \alpha particle is 4 u, what is the mass of the daughter nucleus after 10 half-lives?
A. 36 g
B. 40 g
C. 44 g
D. 48 g
Question 15
A 50 Hz AC voltage is applied across a circuit containing a resistor of 10 ohms and an inductor of 5 H. If the initial current is 0 A, calculate the current in the circuit after 0.1 s.
A. 0.1 A
B. 0.2 A
C. 0.3 A
D. 0.4 A

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: