POST UTME RSU 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A photon of wavelength 600 nm is incident on a metal surface. If the work function of the metal is 2.0 eV, what is the maximum kinetic energy of the emitted electron?
A. 1.0 eV
B. 2.0 eV
C. 3.0 eV
D. 4.0 eV
Question 2
A circuit consists of a 12 V battery, a 2 Ω resistor, and an unknown resistor. If the current in the circuit is 4 A, what is the value of the unknown resistor?
A. 1 Ω
B. 2 Ω
C. 4 Ω
D. 6 Ω
Question 3
A heat engine operates between temperatures of 500 K and 300 K. What is the efficiency of the engine?
A. 0.25
B. 0.33
C. 0.5
D. 0.67
Question 4
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. 1.0 A
B. 2.0 A
C. 3.0 A
D. 4.0 A
Question 5
A \tank of capacity $V$ contains water of density $\rho$ to a depth $h$. Find the pressure at the bottom of the \tank.
A. P = \rho g h
B. P = \frac{\rho g h}{2}
C. P = \frac{2 \rho g h}{V}
D. P = \frac{V \rho g}{2 h}
Question 6
A current of 2 A flows through a 10 Ω resistor. Calculate the power dissipated by the resistor.
A. 20 W
B. 40 W
C. 60 W
D. 80 W
Question 7
A 5 kg block is moving with a velocity of 10 m/s. Calculate the kinetic energy of the block.
A. 25 J
B. 50 J
C. 75 J
D. 100 J
Question 8
A gas is enclosed in a container with a movable piston. The gas is heated, cau\sing its temperature to increase. Which of the following statements is true about the behavior of the gas?
A. The volume of the gas decreases.
B. The pressure of the gas increases.
C. The number of moles of the gas increases.
D. The temperature of the gas remains cons\tant.
Question 9
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 10
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. Find the magnitude of the force acting on the particle.
A. F = \frac{m v^2}{r}
B. F = \frac{m r^2}{v}
C. F = \frac{v^2}{m r}
D. F = \frac{r^2}{m v}
Question 11
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. Calculate the time of flight.
A. 2 s
B. 4 s
C. 6 s
D. 8 s
Question 12
A ray of light passes from air into a glass slab 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 13
A block of mass $m$ is attached to a horizontal spring of spring cons\tant $k$. The block is displaced by a dis\tance $x$ from its equilibrium position and then released. Find the equation of motion of the block.
A. x(t) = A \cos \omega t + B \sin \omega t
B. x(t) = A \sin \omega t + B \cos \omega t
C. x(t) = A \cos \omega t - B \sin \omega t
D. x(t) = A \sin \omega t - B \cos \omega t
Question 14
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. What is the magnitude of the centripetal force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 15
A wave is traveling through a medium with a speed of 300 m/s. If the frequency of the wave is 50 Hz, what is the wavelength of the wave?
A. 6 m
B. 12 m
C. 15 m
D. 20 m

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