POST UTME LASU 2019 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 0.2 m. What is the speed of the wave?
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 2
A wire of length $L$ and cross-sectional area $A$ is stretched by a force $F$. What is the tension in the wire?
A. \frac{F}{A}
B. \frac{A}{F}
C. \frac{L}{F}
D. \frac{F}{L}
Question 3
A gas at a pressure of 3 atm and a temperature of 400 K is allowed to expand to a volume of 10 L. If the gas is ideal, what is the final pressure of the gas?
A. 1.5 atm
B. 2 atm
C. 2.5 atm
D. 3 atm
Question 4
A circuit consists of a 15 V battery, a 6 Ω resistor, and a 3 Ω resistor connected in parallel. What is the current flowing through the 6 Ω resistor?
A. 1 A
B. 2 A
C. 3 A
D. 4 A
Question 5
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 6
A simple harmonic motion has a maximum displacement of 0.5 m and a time period of 2 s. What is the angular frequency of the motion?
A. 1 rad/s
B. 2 rad/s
C. 3 rad/s
D. 4 rad/s
Question 7
A gas at a pressure of 2 atm and a temperature of 300 K is allowed to expand to a volume of 5 L. If the gas is ideal, what is the final pressure of the gas?
A. 1 atm
B. 1.5 atm
C. 2 atm
D. 2.5 atm
Question 8
A magnetic field is produced by a current-carrying wire. If the current in the wire is doubled, what happens to the magnetic field?
A. The magnetic field increases by a factor of 2.
B. The magnetic field increases by a factor of 4.
C. The magnetic field remains the same.
D. The magnetic field decreases by a factor of 2.
Question 9
A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 5 V is applied across it, what is the charge stored on the capacitor?
A. 25 μC
B. 50 μC
C. 75 μC
D. 100 μC
Question 10
A 5.0 g sample of a gas at 27°C and 1.0 atm is heated to 127°C at cons\tant volume. What is the final pressure of the gas in atm?
A. 2.0 atm
B. 3.0 atm
C. 4.0 atm
D. 5.0 atm
Question 11
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 angular velocity of the particle?
A. 10 rad/s
B. 20 rad/s
C. 30 rad/s
D. 40 rad/s
Question 12
A particle of mass $m$ is confined to a one-dimensional box of length $L$. The wave function of the particle is given by (psi(x) = \sqrt{\frac{2}{L}} \sinleft\( \frac{npi x}{L}\right \)). What is the expectation value of the position operator for this particle?
A. \frac{L}{2}
B. \frac{L}{4}
C. \frac{3L}{4}
D. \frac{L}{3}
Question 13
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the circuit?
A. 1 A
B. 2 A
C. 3 A
D. 4 A
Question 14
A block of mass 2 kg is attached to a horizontal spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and then released. What is the maximum speed of the block?
A. 0.2 m/s
B. 2 m/s
C. 4 m/s
D. 6 m/s
Question 15
A gas is enclosed in a cylinder with a movable piston. The gas is heated, cau\sing its pressure to increase. If the piston is allowed to move freely, what will happen to the volume of the gas?
A. The volume will decrease
B. The volume will increase
C. The volume will remain cons\tant
D. The volume will increase and then decrease

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