POST UTME LASU 2024 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A car is traveling at a speed of 60 km/h. If the driver applies the brakes and the car comes to a stop in 10 seconds, what is the magnitude of the acceleration of the car?
A. -6 m/s^2
B. -12 m/s^2
C. -18 m/s^2
D. -24 m/s^2
Question 2
A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. What is the speed of the sound wave?
A. 100 m/s
B. 200 m/s
C. 300 m/s
D. 400 m/s
Question 3
A 100 V, 50 Hz AC source is connected to a 50 Ω resistor. What is the rms value of the current flowing through the resistor?
A. 1 A
B. 2 A
C. 5 A
D. 10 A
Question 4
A 10 μF capacitor is connected in series with a 20 Ω resistor and a 120 V AC source. What is the impedance of the circuit?
A. 15 Ω
B. 20 Ω
C. 25 Ω
D. 30 Ω
Question 5
A heat engine operates between two reservoirs at temperatures $T_1 = 500\,\text{K}$ and $T_2 = 300\,\text{K}$. If the engine produces 2000 J of work, what is the efficiency of the engine?
A. 0.4
B. 0.5
C. 0.6
D. 0.7
Question 6
A gas is enclosed in a container with a movable piston. The gas is heated from 300 K to 400 K. If the initial volume is 2.0 L and the final volume is 4.0 L, what is the value of the gas cons\tant R?
A. 8.314 J/mol·K
B. 10.73 J/mol·K
C. 12.47 J/mol·K
D. 20.79 J/mol·K
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 subject to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 10 m/s^2
B. 12 m/s^2
C. 15 m/s^2
D. 20 m/s^2
Question 8
A radioactive sample decays from 100 mg to 50 mg in 10 minutes. What is the half-life of the sample?
A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 20 minutes
Question 9
A wave has a frequency of 100 Hz and a wavelength of 0.5 m. What is the speed of the wave?
A. 50 m/s
B. 100 m/s
C. 150 m/s
D. 200 m/s
Question 10
A 5.0 m long rod is heated from 20°C to 100°C. If the coefficient of linear expansion is 10 × 10^\( -6 \) K^\( -1 \), what is the change in length?
A. 0.05 m
B. 0.10 m
C. 0.15 m
D. 0.20 m
Question 11
A sound wave has a frequency of $f = 200\,\text{Hz}$ and a speed of $v = 340\,\text{m/s}$. If the sound wave is traveling through a medium with a density of $\rho = 1.2\,\text{kg/m}^3$, what is the wavelength of the sound wave?
A. 0.17\,\text{m}
B. 0.34\,\text{m}
C. 0.51\,\text{m}
D. 0.68\,\text{m}
Question 12
A parallel plate capacitor has plates of area $A$ and separation $d$. If the capacitor is charged to a potential difference $V$, what is the energy stored in the capacitor?
A. \frac{1}{2}CV^2
B. \frac{1}{2}AV^2
C. \frac{1}{2}dV^2
D. \frac{1}{2}AVd
Question 13
A circuit consists of a 12 V battery, a 4 Ω resistor, and an unknown resistor. The current in the circuit is 2 A. What is the value of the unknown resistor?
A. 2 Ω
B. 4 Ω
C. 6 Ω
D. 8 Ω
Question 14
A 2.0 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. What is the maximum speed of the block?
A. 1.0 m/s
B. 2.0 m/s
C. 3.0 m/s
D. 4.0 m/s
Question 15
A magnetic field is produced by a current-carrying wire. If the current is 2 A and the wire is 0.5 m long, what is the magnitude of the magnetic field at a dis\tance of 1 m from the wire?
A. 0.1 T
B. 0.2 T
C. 0.3 T
D. 0.4 T

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