POST UTME MADONNA UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
A 1000 Hz AC voltage source is connected to a 50 Ω resistor. If the peak voltage is 20 V, calculate the root mean square (RMS) value of the current flowing through the resistor.
A. 0.2 A
B. 0.4 A
C. 0.8 A
D. 1.6 A
Question 3
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 4
A convex lens of focal length 20 cm forms an image of a 5 cm tall object at a dis\tance of 30 cm from the lens. What is the magnification?
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 5
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 6
A particle of mass 4 kg is moving in a circular path of radius 5 m with a cons\tant speed of 6 m/s. If the particle is subjected to a centripetal force of 20 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 7
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. 6 m/s^2
B. 8 m/s^2
C. 10 m/s^2
D. 12 m/s^2
Question 8
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 9
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 10
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 11
A capacitor consists of two parallel plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the capaci\tance of the capacitor is 10^-6 F, what is the magnitude of the electric field between the plates?
A. 10^5 V/m
B. 10^6 V/m
C. 10^7 V/m
D. 10^8 V/m
Question 12
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 13
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 14
A radioactive sample decays from 100 g to 50 g in 10 years. What is the half-life?
A. 5 years
B. 10 years
C. 15 years
D. 20 years
Question 15
A circuit consists of a 10 Ω resistor and a 20 Ω resistor connected in series. A voltage of 12 V is applied across the circuit. What is the current flowing through the circuit?
A. 0.4 A
B. 0.6 A
C. 0.8 A
D. 1.0 A

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