POST UTME WELLSPRING UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A wave has a frequency of 50 Hz and a wavelength of 10 m. What is the speed of the wave?
A. 500 m/s
B. 1000 m/s
C. 2000 m/s
D. 5000 m/s
Question 2
A 10 kΩ resistor is connected in series with a 20 V battery. If the current through the resistor is 0.2 mA, what is the power dissipated by the resistor?
A. 2 W
B. 4 W
C. 8 W
D. 16 W
Question 3
A particle of mass $m$ and charge $q$ is moving in a circular path of radius $r$ with speed $v$. What is the magnetic field strength?
A. 0.1 T
B. 0.5 T
C. 1 T
D. 5 T
Question 4
A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across its plates, calculate the charge stored on each plate.
A. 0.2 C
B. 0.4 C
C. 0.6 C
D. 0.8 C
Question 5
A 2 kg block is moving with a velocity of 5 m/s. If the block is brought to rest in 2 seconds, what is the force applied to it?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 6
A particle of mass $m$ is confined to a one-dimensional box of length $L$. If the particle is in the ground state, what is the expectation value of its position?
A. 0
B. L/2
C. L
D. 2L
Question 7
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 8
A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm in front of it. Calculate the magnification of the image.
A. -0.5
B. -1
C. -1.5
D. -2
Question 9
A 1000 Hz AC voltage source is connected in series with a 50 Ω resistor and a 20 μF capacitor. The circuit is driven by a \sinusoidal voltage source with an amplitude of 10 V. Assuming the capacitor is initially uncharged, what is the maximum value of the current in the circuit?
A. 2 A
B. 5 A
C. 10 A
D. 20 A
Question 10
A block of mass 5 kg is attached to a horizontal spring with a spring cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 11
A 2 m long rod is heated from 20°C to 100°C. What is the change in its length?
A. 0.2 m
B. 0.4 m
C. 0.6 m
D. 0.8 m
Question 12
A 1000 μF capacitor is connected in series with a 2000 μF capacitor across a 12 V DC source. Calculate the equivalent capaci\tance and the charge stored on the capacitors.
A. 1200 μF
B. 1000 μF
C. 800 μF
D. 600 μF
Question 13
A current of 2 A flows through a resistor of 4 Ω. Calculate the power dissipated in the resistor.
A. 4 W
B. 8 W
C. 12 W
D. 16 W
Question 14
A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across it, what is the charge stored on the plates?
A. 20 μC
B. 40 μC
C. 80 μC
D. 100 μC
Question 15
A 2 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Calculate the angular frequency and the maximum speed of the block.
A. 5.0 rad/s
B. 7.071 rad/s
C. 10.0 rad/s
D. 14.1 rad/s

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