POST UTME DELSU 2018 Physics | Objective

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Question 1
A sound wave has a frequency of 200 Hz and a speed of 340 m/s. Find the wavelength of the wave.
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 2
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. -5 cm
B. -10 cm
C. -20 cm
D. -30 cm
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. Find the magnitude of the force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 4
A radioactive sample has a half-life of 5 years. If the initial activity is 1000 Bq, what is the activity after 10 years?
A. 125 Bq
B. 250 Bq
C. 500 Bq
D. 1000 Bq
Question 5
A beam of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 25°
C. 30°
D. 35°
Question 6
A wave has a frequency of 50 Hz and a wavelength of 0.2 m. Find the speed of the wave.
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 7
A parallel plate capacitor has plates of area 0.1 m^2 and separation 0.01 m. The dielectric cons\tant of the material between the plates is 3. The capacitor is connected to a battery of emf 12 V. Find the capaci\tance of the capacitor.
A. 0.01 F
B. 0.02 F
C. 0.03 F
D. 0.04 F
Question 8
A thermodynamic system undergoes a process from state A to state B, where the initial temperature is 300 K and the final temperature is 400 K. If the change in entropy is 100 J/K, calculate the heat transferred during the process.
A. 40000 J
B. 4000 J
C. 400 J
D. 40 J
Question 9
A particle of mass 2 kg is attached to a spring with spring cons\tant 100 N/m. It is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the maximum kinetic energy of the particle.
A. 0.5 J
B. 1.0 J
C. 1.25 J
D. 1.5 J
Question 10
A gas is confined to a cylinder of volume 2 m^3 at a temperature of 300 K. If the temperature is increased to 400 K, what is the new volume of the gas?
A. 2.5 m^3
B. 3.0 m^3
C. 3.5 m^3
D. 4.0 m^3
Question 11
A gas is enclosed in a container of volume 0.1 m^3. The pressure is 10^5 Pa and the temperature is 300 K. Calculate the number of moles of gas present.
A. 0.01 mol
B. 0.02 mol
C. 0.03 mol
D. 0.04 mol
Question 12
A magnetic field is produced by a current-carrying wire. If the current is 2 A and the length of the wire is 1 m, what is the magnetic field strength at a dis\tance of 0.5 m from the wire?
A. 0.1 T
B. 0.2 T
C. 0.3 T
D. 0.4 T
Question 13
A concave lens of focal length -20 cm is placed in contact with a convex lens of focal length 15 cm. What is the focal length of the combination?
A. -5 cm
B. -10 cm
C. -15 cm
D. -20 cm
Question 14
A beam of light is incident on a prism at an angle of 30°. The re\fractive index of the prism is 1.5. Calculate the angle of re\fraction.
A. 20°
B. 30°
C. 40°
D. 50°
Question 15
A capacitor consists of two parallel plates, each of area $A$ and separation $d$. The plates are charged to a potential difference $V$. Find the capaci\tance of the capacitor.
A. \frac{\epsilon_0 A}{d}
B. \frac{d}{\epsilon_0 A}
C. \frac{\epsilon_0 d}{A}
D. \frac{A}{\epsilon_0 d}

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