POST UTME MADONNA UNIVERSITY 2020 Physics | Objective

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Question 1
A sound wave with a frequency of 200 Hz and a wavelength of 1.5 m is traveling through a medium with a speed of 340 m/s. Calculate the amplitude of the wave.
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 2
A photon of energy $E$ is incident on a metal surface. The work function of the metal is $\phi$. Find the maximum kinetic energy of the electron emitted.
A. $E - \phi$
B. $E + \phi$
C. $\frac{E}{\phi}$
D. $\frac{\phi}{E}$
Question 3
A spring of force cons\tant 100 N/m is stretched by 5 cm. What is the potential energy stored?
A. 1.25 J
B. 2.50 J
C. 3.75 J
D. 5.00 J
Question 4
A lens of focal length 30 cm is placed in a beam of light. If the object dis\tance is 40 cm, what is the image dis\tance?
A. 20 cm
B. 30 cm
C. 40 cm
D. 50 cm
Question 5
A container of volume $V$ contains a mixture of ideal gases. The mixture consists of $n_1$ moles of gas 1 and $n_2$ moles of gas 2. The partial pressures of the two gases are $P_1$ and $P_2$, respectively. Use the ideal gas law to find the total number of moles of gas in the mixture.
A. $n_1 + n_2$
B. $\frac{n_1 P_1 + n_2 P_2}{V}$
C. $\frac{n_1 P_1 + n_2 P_2}{V} + \frac{n_1 P_2 + n_2 P_1}{V}$
D. $\frac{n_1 P_1 + n_2 P_2}{V} + P_1 + P_2$
Question 6
A magnetic field of magnitude 0.5 T is applied to a current-carrying wire of length 2 m. If the current in the wire is 5 A, what is the magnitude of the force exerted on the wire?
A. 0.5 N
B. 1 N
C. 2 N
D. 5 N
Question 7
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. The capaci\tance is 2.5 nF. If a potential difference of 10 V is applied across the plates, what is the charge on the positive plate?
A. 6.25 \u00B5 C
B. 12.5 \u00B5 C
C. 25 \u00B5 C
D. 50 \u00B5 C
Question 8
A particle moves in a circular path with a radius of 2 m and a frequency of 5 Hz. If the particle starts at the top of the circle and moves clockwise, what is the direction of the force acting on the particle?
A. towards the center
B. away from the center
C. perp\endicular to the radius
D. along the radius
Question 9
A body of mass 5 kg is moving in a straight line with a velocity of 10 m/s. If a force of 20 N is applied to the body, what is the acceleration of the body?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 10
A gas at 300 K expands from 1 L to 2 L against a cons\tant external pressure of 1 atm. What is the work done?
A. 1.0 J
B. 2.0 J
C. 3.0 J
D. 4.0 J
Question 11
A body of mass 7 kg is moving in a straight line with a velocity of 14 m/s. If a force of 35 N is applied to the body, what is the acceleration of the body?
A. 5 m/s^2
B. 7 m/s^2
C. 9 m/s^2
D. 11 m/s^2
Question 12
A lens of focal length 20 cm is placed in a beam of light. If the object dis\tance is 30 cm, what is the image dis\tance?
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
Question 13
A gas at 300 K and 1 atm is compressed to 2 atm. If the initial volume is 2.5 L, what is the final volume?
A. 1.25 L
B. 1.5 L
C. 1.75 L
D. 2.0 L
Question 14
A particle of mass 3 kg is moving in a circular path of radius 4 m with a cons\tant speed of 5 m/s. If the particle is subjected to a centripetal force of 15 N, what is the magnitude of the acceleration of the particle?
A. 5 m/s^2
B. 10 m/s^2
C. 15 m/s^2
D. 20 m/s^2
Question 15
A gas is heated from 20°C to 80°C. If the initial volume is 2 L and the final volume is 4 L, what is the final pressure?
A. 1.6 atm
B. 2.0 atm
C. 2.4 atm
D. 3.2 atm

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