POST UTME CALEB UNIVERSITY 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A radioactive sample has a half-life of 5 years. If the initial activity of the sample is 100 Bq, what is the activity of the sample after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 2
A 2 mH inductor is connected in series with a 10 Ω resistor and a 120 V AC source. What is the impedance?
A. 10 Ω
B. 20 Ω
C. 30 Ω
D. 40 Ω
Question 3
A gas is contained in a cylinder of volume 2 m^3 at a pressure of 100 kPa. If the temperature of the gas is increased by 20 K, what is the new pressure of the gas?
A. 120 kPa
B. 140 kPa
C. 160 kPa
D. 180 kPa
Question 4
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/s^2, what is the magnitude of the force acting on the particle?
A. 10 N
B. 12 N
C. 8 N
D. 6 N
Question 5
A simple harmonic motion has a frequency of 2 Hz and an amplitude of 3 m. If the motion is at its maximum displacement at time t = 0, what is the equation of motion?
A. x(t) = 3 \sin\( 4\pi t \)
B. x(t) = 3 \sin\( 2\pi t \)
C. x(t) = 3 \sin\( 4\pi t + \pi/2 \)
D. x(t) = 3 \sin\( 2\pi t + \pi/2 \)
Question 6
A body of mass 2 kg is moving with a velocity of 5 m/s. Calculate its kinetic energy.
A. 10 J
B. 20 J
C. 25 J
D. 50 J
Question 7
A 10 μF capacitor is connected in series with a 20 Ω resistor and a 120 V AC source. What is the phase angle between the voltage and current?
A. 30°
B. 45°
C. 60°
D. 75°
Question 8
A capacitor consists of two parallel plates, each of area 0.2 m^2, separated by a dis\tance of 0.02 m. If the capaci\tance is 2 x 10^-6 F, what is the charge stored on the capacitor when a potential difference of 20 V is applied?
A. 4 x 10^-5 C
B. 2 x 10^-5 C
C. 10^-5 C
D. 5 x 10^-6 C
Question 9
A radioactive sample emits \alpha particles with a half-life of 5 days. If the initial activity is 100 Bq, what is the activity after 10 days?
A. 50 Bq
B. 25 Bq
C. 12.5 Bq
D. 6.25 Bq
Question 10
A wave with a frequency of 100 Hz and a wavelength of 1 m is traveling through a medium. If the wave is reflected from a fixed \end, what is the wavelength of the reflected wave?
A. 0.5 m
B. 1 m
C. 1.5 m
D. 2 m
Question 11
A gas at 300 K and 1 atm expands isothermally to a volume of 10 L. What is the work done?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 12
A 50 Hz AC generator has an emf of 200 V. If the current drawn from the generator is 10 A, what is the power factor of the circuit?
A. 0.5
B. 0.8
C. 0.9
D. 0.95
Question 13
A 2 kg block is moving at 4 m/s on a frictionless surface when it collides with a stationary 1 kg block. If the collision is perfectly elastic, what is the velocity of the 2 kg block after the collision?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 14
A particle of mass 1 kg is moving in a straight line with an initial velocity of 5 m/s. If the particle is subjected to a cons\tant acceleration of 2 m/s^2, what is the velocity of the particle after 3 seconds?
A. 7 m/s
B. 9 m/s
C. 11 m/s
D. 13 m/s
Question 15
A wave has a frequency of 50 Hz and a wavelength of 2 m. If the wave is traveling in the positive x-direction, what is the direction of the particle velocity?
A. positive x-direction
B. negative x-direction
C. positive y-direction
D. negative y-direction

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