POST UTME LASU 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A parallel plate capacitor consists of two plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the capaci\tance is 10 μF, what is the magnitude of the electric field between the plates?
A. 1000 V/m
B. 2000 V/m
C. 3000 V/m
D. 4000 V/m
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. 30°
C. 40°
D. 50°
Question 3
A parallel plate capacitor has a capaci\tance of $C$. If the dis\tance between the plates is doubled, what is the new capaci\tance?
A. $C/2$
B. $C$
C. $2C$
D. $4C$
Question 4
A parallel plate capacitor has plates of area 0.1 m^2 and separation 0.01 m. If a potential difference of 10 V is applied across the plates, what is the capaci\tance?
A. 10^-9 F
B. 10^-8 F
C. 10^-7 F
D. 10^-6 F
Question 5
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 6
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 7
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 8
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 experiences a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 9
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 10
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. $\frac{1}{2}mv^2 + \frac{k}{r^2}$
Question 11
A block of wood is floating in water. What is the apparent weight of the block?
A. 0.5 kg
B. 0.6 kg
C. 0.7 kg
D. 0.8 kg
Question 12
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 force of 6 N, what is the magnitude of the acceleration of the particle?
A. 3 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 13
A coil of wire has a resis\tance of $R$ and an induc\tance of $L$. If a current of $I$ flows through it, what is the total energy stored in the coil?
A. $\frac{1}{2}LI^2$
B. $\frac{1}{2}RI^2$
C. $\frac{1}{2}LRI$
D. $\frac{1}{2}R^2I^2$
Question 14
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 15
A block of mass 5 kg is placed on a frictionless surface and a horizontal force of 20 N is applied to it. If the block starts moving from rest, what is the magnitude of the acceleration of the block?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2

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