POST UTME LASU 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.0 kg object is moving in a circular path with a radius of 3.0 m at a cons\tant speed of 4.0 m/s. If the object experiences a centripetal acceleration of 2.0 m/s^2, what is the magnitude of the net force acting on the object?
A. 8.0 N
B. 12.0 N
C. 16.0 N
D. 20.0 N
Question 2
A projectile is launched at an angle $\theta$ to the horizontal with an initial velocity $v_0$. If the projectile is subject to a gravitational acceleration $g$, what is the maximum height $h$ reached by the projectile?
A. \frac{v_0^2\sin^2\theta}{2g}
B. \frac{v_0^2\sin\theta}{2g}
C. \frac{v_0^2\cos\theta}{2g}
D. \frac{v_0^2\sin\theta\cos\theta}{2g}
Question 3
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. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 4
A particle of mass 5 kg is moving in a straight line with a velocity of 10 m/s. If the particle is subjected to a force of 20 N, what is the acceleration?
A. 2 m/s²
B. 4 m/s²
C. 6 m/s²
D. 8 m/s²
Question 5
A 100 W light bulb is connected to a 120 V power source. If the light bulb is turned on for 8 hours, how much energy is consumed by the light bulb?
A. 768 J
B. 7680 J
C. 76800 J
D. 768000 J
Question 6
A block of mass 5 kg is attached to a horizontal spring with a force cons\tant of 200 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
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. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 8
A 2.0 L container holds 1.5 mol of an ideal gas at a temperature of 300 K. If the gas is heated to 400 K while the volume remains cons\tant, what is the final pressure of the gas?
A. 2.5 atm
B. 3.0 atm
C. 3.5 atm
D. 4.0 atm
Question 9
A gas is contained in a cylinder with a volume of 0.05 m^3. The gas is heated from 300 K to 400 K, cau\sing its pressure to increase from 100 kPa to 150 kPa. What is the change in the number of moles of the gas?
A. 0.01 mol
B. 0.05 mol
C. 0.1 mol
D. 0.2 mol
Question 10
A capacitor consists of two parallel plates, each of area 0.04 m^2, separated by a dis\tance of 0.02 m. If the capaci\tance is 8 μF, what is the charge stored on the capacitor when a potential difference of 12 V is applied?
A. 96 μC
B. 192 μC
C. 288 μC
D. 384 μC
Question 11
A gas is contained in a cylinder of volume $V$ and is subject to a pressure $P$. If the temperature is $T$, what is the magnitude of the work $W$ done by the gas?
A. \frac{PV}{T}
B. \frac{PV}{2T}
C. \frac{PV}{3T}
D. \frac{PV}{4T}
Question 12
A radioactive sample decays at a rate of 0.5% per hour. If the initial mass of the sample is 100 g, what is the mass of the sample after 5 hours?
A. 50 g
B. 75 g
C. 87.5 g
D. 100 g
Question 13
A ray of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 30°
C. 40°
D. 50°
Question 14
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. If the particle is subject to a centripetal force $F_c$, what is the magnitude of the acceleration $a$?
A. \frac{F_c}{m}
B. \frac{v^2}{r}
C. \frac{F_c}{m} + \frac{v^2}{r}
D. \frac{F_c}{m} - \frac{v^2}{r}
Question 15
A capacitor consists of two parallel plates, each with a surface area of 0.01 m^2. The plates are separated by a dis\tance of 0.001 m and are charged to a potential difference of 100 V. What is the capaci\tance of the capacitor?
A. 0.01 F
B. 0.001 F
C. 0.0001 F
D. 0.00001 F

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