POST UTME REDEEMERS UNIVERSITY 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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/s^2, what is the magnitude of the force acting on the particle?
A. 2 N
B. 4 N
C. 6 N
D. 8 N
Question 2
A light ray passes from air into a glass of re\fractive index $\mu = 1.5$. If the angle of incidence is $30^\circ$, what is the angle of re\fraction?
A. 20^\circ
B. 25^\circ
C. 30^\circ
D. 35^\circ
Question 3
A 100 W bulb is connected to a 220 V AC supply. What is the current drawn by the bulb?
A. 0.4 A
B. 0.5 A
C. 0.6 A
D. 0.7 A
Question 4
A light ray passes from air into a glass block with a re\fractive index of 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 5
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 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the maximum speed of the block as it passes through the equilibrium position.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 6
A sound wave with a frequency of 200 Hz has a speed of 340 m/s. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2.0 m
Question 7
A ray of light passes from air into a glass block of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 18.43°
B. 20°
C. 22.62°
D. 30°
Question 8
A particle of mass 1.0 kg is moving in a straight line with an initial velocity of 5.0 m/s. If the particle experiences a cons\tant acceleration of 2.0 m/s², what is the velocity of the particle after 3.0 s?
A. 7.0 m/s
B. 8.0 m/s
C. 9.0 m/s
D. 10.0 m/s
Question 9
A heat engine operates between two temperatures of 400 K and 200 K. If the engine produces 800 J of work, what is the efficiency of the engine?
A. 25%
B. 30%
C. 35%
D. 40%
Question 10
A photon of wavelength 500 nm is incident on a metal surface. If the work function of the metal is 2 eV, what is the maximum kinetic energy of the electron emitted?
A. 1.5 eV
B. 2.5 eV
C. 3.5 eV
D. 4.5 eV
Question 11
A point charge $q$ is placed at the center of a spherical shell of radius $R$. If the electric field at a dis\tance $r$ from the center of the shell is $E$, what is the electric field at a dis\tance $2R$ from the center of the shell?
A. \frac{kq}{(2R)^2}
B. \frac{kq}{R^2}
C. \frac{kq}{\( R + 2R \)^2}
D. \frac{kq}{\( R - 2R \)^2}
Question 12
A particle of mass $m$ is projected from the origin with an initial velocity $v_0$ at an angle $\theta$ to the horizontal. If the particle is subject to a uniform gravitational field of strength $g$, determine the time $t$ at which the particle reaches its maximum height.
A. t = \frac{v_0 \sin \theta}{g}
B. t = \frac{v_0 \cos \theta}{g}
C. t = \frac{v_0 \sin \theta}{g^2}
D. t = \frac{v_0 \cos \theta}{g^2}
Question 13
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. If the current in the circuit is 2 A, what is the voltage across the 6 Ω resistor?
A. 6 V
B. 8 V
C. 10 V
D. 12 V
Question 14
A 100 V, 10 A AC supply is connected to a 20 ohm resistor. Calculate the power consumed by the resistor.
A. 200 W
B. 400 W
C. 600 W
D. 800 W
Question 15
A radioactive sample decays at a rate of 0.02% per hour. If the initial mass of the sample is 100 g, calculate the mass of the sample after 5 hours.
A. 90 g
B. 92 g
C. 94 g
D. 96 g

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