POST UTME LASU 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A block of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.1 m from its equilibrium position and released, what is the maximum kinetic energy of the block?
A. 0.1 J
B. 0.2 J
C. 0.5 J
D. 1 J
Question 2
A 100 W light bulb is connected to a 220 V power source. If the bulb is 5% efficient, what is the resis\tance of the bulb?
A. 10 Ω
B. 20 Ω
C. 30 Ω
D. 40 Ω
Question 3
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 centripetal force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 4
A solid sphere of radius $R$ is made of a material with density $\rho$. If the sphere is susp\ended in a fluid of density $sigma$, what is the magnitude of the buoyant force acting on the sphere?
A. 4\pi R^3 \rho g
B. 4\pi R^3 \sigma g
C. 2\pi R^3 \rho g
D. 2\pi R^3 \sigma g
Question 5
A capacitor of capaci\tance 10 μF is connected to a 12 V power source. If the capacitor is initially uncharged, what is the charge on the capacitor after 5 seconds?
A. 0.12 C
B. 0.24 C
C. 0.36 C
D. 0.48 C
Question 6
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 5 V. If a dielectric material with a dielectric cons\tant of 2 is inserted between the plates, what is the new capaci\tance?
A. 20 μF
B. 25 μF
C. 30 μF
D. 40 μF
Question 7
A particle of mass 0.5 kg is moving in a circular path with a radius of 0.2 m. The particle has a velocity of 2 m/s. What is the centripetal force acting on the particle?
A. 0.5 N
B. 1.0 N
C. 2.0 N
D. 5.0 N
Question 8
A resistor of 10 Ω and an inductor of 5 H are connected in series. A voltage of 20 V is applied across the circuit. What is the current in the circuit?
A. 0.5 A
B. 1.0 A
C. 2.0 A
D. 4.0 A
Question 9
A particle of mass $m$ is attached to a spring with spring cons\tant $k$. If the particle is displaced by a dis\tance $x$ from its equilibrium position and released from rest, what is the period of oscillation?
A. 2\pi \sqrt{\frac{k}{m}}
B. 2\pi \sqrt{\frac{m}{k}}
C. \pi \sqrt{\frac{k}{m}}
D. \pi \sqrt{\frac{m}{k}}
Question 10
A charged particle of mass 2 × 10^-6 kg and charge 3 × 10^-6 C is moving in a magnetic field of strength 0.5 T. If the particle is moving at a speed of 2 × 10^4 m/s, calculate the force acting on the particle.
A. 1.5 × 10^-3 N
B. 3.0 × 10^-3 N
C. 4.5 × 10^-3 N
D. 6.0 × 10^-3 N
Question 11
A radioactive sample has a half-life of 5 years. If the initial activity of the sample is 1000 Bq, what is the activity of the sample after 10 years?
A. 125 Bq
B. 250 Bq
C. 500 Bq
D. 1000 Bq
Question 12
A gas at a pressure of 2 atm and temperature of 300 K expands to a volume of 5 L. What is the final pressure of the gas?
A. 0.4 atm
B. 0.8 atm
C. 1.2 atm
D. 1.6 atm
Question 13
A simple p\endulum of length 1 m is released from an initial angle of 30°. If the p\endulum is released from rest, calculate the time taken for the p\endulum to complete one oscillation.
A. 2 s
B. 4 s
C. 6 s
D. 8 s
Question 14
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 10 N/m. If the particle is displaced by 0.5 m from its equilibrium position, what is the resulting force?
A. 5 N
B. 10 N
C. 20 N
D. 50 N
Question 15
A light ray passes from air into a glass of re\fractive index $\mu$ at an angle of incidence $\theta_i$. If the angle of re\fraction is $\theta_r$, what is the value of $\mu$?
A. \frac{\sin \theta_r}{\sin \theta_i}
B. \frac{\sin \theta_i}{\sin \theta_r}
C. \frac{\cos \theta_i}{\cos \theta_r}
D. \frac{\cos \theta_r}{\cos \theta_i}

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: