POST UTME LAUTECH 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A body of mass 5 kg is moving in a circular path of radius 2 m with a cons\tant speed of 4 m/s. If the body is subjected to a centripetal force of 10 N, calculate the time taken by the body to complete one revolution.
A. 2 s
B. 4 s
C. 6 s
D. 8 s
Question 2
A 50 Hz AC generator produces an emf of 100 V. If the generator is connected to a 10 Ω load, calculate the current flowing through the load.
A. 5 A
B. 10 A
C. 15 A
D. 20 A
Question 3
A beam of light is incident on a glass slab at an angle of 30°. The re\fractive index of the glass is 1.5. Calculate the angle of re\fraction.
A. 20°
B. 30°
C. 40°
D. 50°
Question 4
A body of mass 5 kg is moving with a velocity of 10 m/s. If the body is subjected to a force of 20 N, what is the acceleration of the body?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 5
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. The particle experiences a centripetal force $F_c$ given by $F_c = \frac{mv^2}{r}$. If the particle's speed is doubled to $2v$, what is the new centripetal force $F_{c,new}$?
A. 4mv^2/r
B. 2mv^2/r
C. mv^2/r
D. mv^4/r
Question 6
A 5.0 kg block is attached to a horizontal, massless spring with a force cons\tant of 100.0 N/m. The block is displaced by 2.0 m from its equilibrium position and released from rest. What is the speed of the block when it passes through the equilibrium position?
A. 1.0 m/s
B. 2.0 m/s
C. 3.0 m/s
D. 4.0 m/s
Question 7
A uniform magnetic field of magnitude 2.0 T is directed along the positive z-axis. A current of 5.0 A flows in a circular loop of radius 0.20 m, placed in the x-y plane. What is the magnitude of the magnetic moment of the loop?
A. 0.10 A m^2
B. 0.20 A m^2
C. 0.30 A m^2
D. 0.40 A m^2
Question 8
A particle of mass 1 kg is moving in a circular path of radius 0.5 m with a speed of 2 m/s. Calculate the centripetal force acting on the particle.
A. 2 N
B. 4 N
C. 6 N
D. 8 N
Question 9
A gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the pressure is increased to 3.0 atm, what is the new volume of the gas?
A. 1.0 L
B. 1.5 L
C. 2.0 L
D. 2.5 L
Question 10
A particle of mass 2.0 kg is moving in a circular path of radius 1.5 m with a speed of 4.0 m/s. What is the magnitude of the force acting on the particle?
A. 10.0 N
B. 20.0 N
C. 30.0 N
D. 40.0 N
Question 11
A magnetic field of magnitude 0.5 T is directed along the z-axis. A current of 2 A flows in a circular loop of radius 0.2 m. Calculate the magnetic moment of the loop.
A. 0.1 A m^2
B. 0.2 A m^2
C. 0.5 A m^2
D. 1 A m^2
Question 12
A ray of light passes from air into a glass slab with a re\fractive index $n$. If the angle of incidence is $\theta_i$ and the angle of re\fraction is $\theta_r$, what is the relationship between $\theta_i$ and $\theta_r$?
A. \frac{\sin \theta_i}{\sin \theta_r} = \frac{1}{n}
B. \frac{\sin \theta_i}{\sin \theta_r} = n
C. \frac{\sin \theta_i}{\sin \theta_r} = \frac{n}{1}
D. \frac{\sin \theta_i}{\sin \theta_r} = \frac{1}{1}
Question 13
A gas occupies a volume of 2.0 L at a pressure of 1.0 atm. What is the new volume of the gas if the pressure is increased to 2.0 atm?
A. 1.0 L
B. 2.0 L
C. 3.0 L
D. 4.0 L
Question 14
A 10 μF capacitor is connected in series with a 20 Ω resistor and a 120 V power source. What is the current flowing through the circuit?
A. 0.5 A
B. 1 A
C. 2 A
D. 5 A
Question 15
A parallel plate capacitor consists of two plates, each of area 0.04 m^2, separated by a dis\tance of 0.02 m. The space between the plates is filled with a dielectric material of relative permittivity 2.5. If a potential difference of 10 V is applied across the plates, calculate the capaci\tance of the capacitor.
A. 0.02 F
B. 0.04 F
C. 0.06 F
D. 0.08 F

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