POST UTME UNILORIN 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A parallel plate capacitor has a capaci\tance of 2.5 μF and is charged to a potential difference of 10 V. If a dielectric slab of thickness 0.5 mm and dielectric cons\tant 4 is inserted between the plates, what is the new capaci\tance?
A. 3.0 μF
B. 4.0 μF
C. 5.0 μF
D. 6.0 μF
Question 2
A capacitor consists of two parallel plates, each of area $A$ and separated by a dis\tance $d$. The plates are charged to a potential difference $V$. What is the capaci\tance of the capacitor?
A. \frac{\epsilon_0 A}{d}
B. \frac{\epsilon_0 A}{2d}
C. \frac{2\epsilon_0 A}{d}
D. \frac{\epsilon_0 A}{2d^2}
Question 3
A particle of mass m is moving in a circular path of radius r under the influence of a centripetal force F. If the particle's speed is increased by a factor of 2, what happens to the centripetal force?
A. The centripetal force increases by a factor of 4
B. The centripetal force increases by a factor of 2
C. The centripetal force remains the same
D. The centripetal force decreases by a factor of 2
Question 4
A convex lens of focal length 15 cm forms an image of a dis\tant object on a screen 30 cm from the lens. What is the magnification of the lens?
A. 0.5
B. 1
C. 1.5
D. 2
Question 5
A p\endulum of length L is released from an initial angle of θ. If the p\endulum is released from rest, what is the angular frequency of the p\endulum?
A. ω = √\( g/L \)
B. ω = √\( g/L \) * \sin(θ)
C. ω = √\( g/L \) * \cos(θ)
D. ω = √\( g/L \) * \tan(θ)
Question 6
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current in the circuit?
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 7
A wave has a frequency of 20 Hz and a wavelength of 0.5 m. Calculate the speed of the wave.
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 8
A beam of light passes through a prism and is re\fracted. The angle of incidence is $30^\circ$ and the angle of re\fraction is $20^\circ$. What is the angle of deviation?
A. 10^\circ
B. 20^\circ
C. 30^\circ
D. 40^\circ
Question 9
A circuit consists of a $10 , \Omega$ resistor, a $20 , \Omega$ resistor, and a $5 , \Omega$ resistor connected in series. What is the total resis\tance of the circuit?
A. $35 , \Omega$
B. $40 , \Omega$
C. $45 , \Omega$
D. $50 , \Omega
Question 10
A capacitor of capaci\tance C is connected to a battery of voltage V. If the capacitor is disconnected from the battery and then reconnected, what happens to the charge on the capacitor?
A. The charge on the capacitor increases
B. The charge on the capacitor decreases
C. The charge on the capacitor remains the same
D. The charge on the capacitor becomes zero
Question 11
A sound wave has a frequency of 200 Hz and a speed of 340 m/s. Calculate the wavelength of the wave.
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2.0 m
Question 12
A body is at rest on a horizontal frictionless surface. A cons\tant horizontal force of 10 N is applied to the body. Calculate the acceleration of the body.
A. 1 m/s^2
B. 2 m/s^2
C. 3 m/s^2
D. 4 m/s^2
Question 13
A 100 Ω resistor is connected in parallel with a 200 Ω resistor. What is the equivalent resis\tance of the circuit?
A. 50 Ω
B. 100 Ω
C. 150 Ω
D. 200 Ω
Question 14
A wave has a frequency of $f = 50 , \text{Hz}$ and a wavelength of $\lambda = 2 , \text{m}$. What is the wave's speed?
A. $100 , \text{m/s}$
B. $200 , \text{m/s}$
C. $500 , \text{m/s}$
D. $1000 , \text{m/s}
Question 15
A particle of mass 2 kg is moving in a straight line with an initial velocity of 5 m/s. It experiences a force of 10 N due to friction. Assuming the force of friction is cons\tant, calculate the particle's velocity after 4 seconds.
A. 15 m/s
B. 20 m/s
C. 25 m/s
D. 30 m/s

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