POST UTME LASU 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 force of 12 N, what is the magnitude of the acceleration of the particle?
A. 10 m/s^2
B. 12 m/s^2
C. 15 m/s^2
D. 20 m/s^2
Question 2
A particle of mass 0.5 kg is moving in a circular path with a radius of 0.2 m. The particle is moving at a speed of 2.0 m/s. Calculate the centripetal force acting on the particle.
A. 2.0 N
B. 4.0 N
C. 6.0 N
D. 8.0 N
Question 3
A convex lens with a focal length of 20 cm is used to form an image of an object placed 30 cm in front of it. What is the magnification of the image?
A. 0.5
B. 0.6
C. 0.7
D. 0.8
Question 4
A block of mass 5 kg is susp\ended from a spring with spring cons\tant 200 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, what is the maximum speed of the block?
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 5
A 5 kg block is susp\ended from a spring with a spring cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position, what is the magnitude of the force exerted by the spring?
A. 100 N
B. 200 N
C. 300 N
D. 400 N
Question 6
A sound wave has a frequency of 200 Hz and a speed of 340 m/s. What is the wavelength?
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2.0 m
Question 7
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. 30°
C. 40°
D. 50°
Question 8
A spring with a spring cons\tant of 100 N/m is stretched by 2 m. What is the magnitude of the force exerted by the spring?
A. 100 N
B. 200 N
C. 300 N
D. 400 N
Question 9
A gas at 300 K expands from 1.0 L to 2.0 L against a cons\tant external pressure of 2.0 atm. Calculate the work done by the gas u\sing the equation \( W = int_{V_1}^{V_2} P , dV \).
A. 4.2 J
B. 8.4 J
C. 12.6 J
D. 16.8 J
Question 10
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in parallel. If the current through the 4 Ω resistor is 2 A, what is the current through the 6 Ω resistor?
A. 1 A
B. 2 A
C. 3 A
D. 4 A
Question 11
A particle of mass 0.5 kg is attached to a spring with a spring cons\tant of 100 N/m. The particle is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the maximum speed of the particle.
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 12
A sound wave has a frequency of 200 Hz and a speed of 343 m/s. If the wave is traveling in the positive x-direction, what is the wavelength of the wave?
A. 0.0017 m
B. 0.017 m
C. 0.17 m
D. 1.7 m
Question 13
A sound wave with a frequency of 200 Hz is traveling through a medium with a speed of 340 m/s. Calculate the wavelength of the sound wave.
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2.0 m
Question 14
A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. The block is displaced by 2 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 15
A particle of mass $m$ is moving in a circular orbit of radius $r$ under the influence of a central force given by $F(r) = -\frac{k}{r^2}$. If the particle's speed is $v$, what is its total energy?
A. $\frac{1}{2}mv^2$
B. $\frac{1}{2}mv^2 + \frac{k}{r}$
C. $\frac{1}{2}mv^2 - \frac{k}{r}$
D. $\frac{1}{2}mv^2 + \frac{k}{r^2}$

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