POST UTME EKSU 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 50 Hz AC supply is connected across a series R-L circuit with R = 20 Ω and L = 0.2 H. Calculate the power factor of the circuit.
A. 0.5
B. 0.6
C. 0.7
D. 0.8
Question 2
A capacitor of capaci\tance 10 μF is connected in series with a resistor of resis\tance 20 Ω. If a voltage of 50 V is applied across the circuit, calculate the current flowing through the circuit.
A. 0.25 A
B. 0.5 A
C. 1 A
D. 2 A
Question 3
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. 5.0 m
B. 10.0 m
C. 15.0 m
D. 20.0 m
Question 4
A 10 kg block is attached to a horizontal spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, 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 5
A radioactive sample has a half-life of 10 minutes. If the initial activity is 100 Bq, what is the activity after 20 minutes?
A. 20 Bq
B. 40 Bq
C. 60 Bq
D. 80 Bq
Question 6
A 10 V AC source is connected to a 50 Ω resistor. If the frequency of the AC source is 50 Hz, what is the rms value of the current flowing through the resistor?
A. 0.2 A
B. 0.5 A
C. 1.0 A
D. 1.5 A
Question 7
A 100 V AC supply is connected across a 50 Ω resistor. What is the current flowing through the resistor?
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 8
A parallel plate capacitor has a capaci\tance of $C = 2 \times 10^{-6} , \text{F}$ and is charged to a potential difference of $V = 10 , \text{V}$. If the plates are separated by a dis\tance of $d = 0.1 , \text{m}$, determine the electric field between the plates.
A. \( E = \frac{V}{d} \)
B. \( E = \frac{V}{2d} \)
C. \( E = \frac{V}{d^2} \)
D. \( E = \frac{V}{2d^2} \)
Question 9
A solid cylindrical block of wood with a radius of 0.05 m and a height of 0.2 m is floating in water. If the density of wood is 500 kg/m3 and the density of water is 1000 kg/m3, what is the volume of the block that is submerged?
A. 0.01 m3
B. 0.02 m3
C. 0.03 m3
D. 0.04 m3
Question 10
A 0.50 kg object is moving in a circular path with a radius of 0.20 m. If the object has a speed of 2.0 m/s, what is the magnitude of the centripetal acceleration?
A. 0.20 m/s²
B. 0.50 m/s²
C. 1.0 m/s²
D. 1.5 m/s²
Question 11
A 50 Hz, 200 V AC supply is connected across a series R-L circuit with R = 10 Ω and L = 0.1 H. Calculate the impedance of the circuit.
A. 10 Ω
B. 20 Ω
C. 30 Ω
D. 40 Ω
Question 12
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 force?
A. 6 N
B. 12 N
C. 18 N
D. 24 N
Question 13
A radioactive sample of Δₗ emits Δₗβ particles with a half-life of 3.8 × 10¹ years. If the initial activity is 2.5 × 10¹ Bq, what is the activity after 1.2 × 10¹ years?
A. 1.1 × 10¹ Bq
B. 1.2 × 10¹ Bq
C. 1.3 × 10¹ Bq
D. 1.4 × 10¹ Bq
Question 14
A sound wave with a frequency of 200 Hz and a wavelength of 1.5 m is traveling through a medium. What is the speed of the sound wave?
A. 300 m/s
B. 400 m/s
C. 500 m/s
D. 600 m/s
Question 15
A body of mass 10 kg is moving with a velocity of 20 m/s. If the body is subjected to a force of 40 N, calculate the work done in moving the body through a dis\tance of 5 m.
A. 100 J
B. 200 J
C. 300 J
D. 400 J

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: