POST UTME DELSU 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A radioactive sample decays by a first-order process with a half-life of 10 minutes. If the initial activity is 100 Bq, calculate the activity after 30 minutes.
A. 20 Bq
B. 30 Bq
C. 40 Bq
D. 50 Bq
Question 2
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 3
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 4
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 5
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 6
A particle of mass $m$ is moving in a circular orbit of radius $r$ with a speed $v$. Find the centripetal force acting on the particle.
A. \frac{mv^2}{r}
B. \frac{mr^2}{v}
C. \frac{rv^2}{m}
D. \frac{mv}{r^2}
Question 7
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 8
A thermodynamic system undergoes a process from state A to state B. If the system's internal energy is 100 J at state A and 120 J at state B, and the work done by the system is 20 J, what is the heat transfer into the system?
A. 80 J
B. 120 J
C. 100 J
D. 140 J
Question 9
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 10
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 11
A 100 W bulb is connected to a 220 V mains supply. Calculate the current flowing through the bulb.
A. 0.4 A
B. 0.5 A
C. 0.6 A
D. 0.7 A
Question 12
A particle of mass 0.1 kg is attached to a spring with spring cons\tant 10 N/m. The particle is displaced by 0.05 m from its equilibrium position and released from rest. Calculate the frequency of oscillation.
A. 0.5 Hz
B. 1 Hz
C. 2 Hz
D. 5 Hz
Question 13
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. If the particle is subjected to a centripetal acceleration of 2 m/s², what is the magnitude of the force acting on the particle?
A. 10 N
B. 12 N
C. 15 N
D. 18 N
Question 14
A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. If the particle is subjected to a centripetal acceleration of 1 m/s², what is the magnitude of the force acting on the particle?
A. 6 N
B. 8 N
C. 10 N
D. 12 N
Question 15
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

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