POST UTME RHEMA UNIVERSITY 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A parallel plate capacitor has a capaci\tance of 2 μF. If a potential difference of 10 V is applied across the plates, calculate the charge stored on each plate.
A. 20 μC
B. 40 μC
C. 80 μC
D. 160 μC
Question 2
A 2.5 mH inductor is connected in series with a 10 Ω resistor and a 20 V AC source. If the frequency of the source is 50 Hz, what is the impedance of the circuit?
A. 10 Ω
B. 20 Ω
C. 30 Ω
D. 40 Ω
Question 3
A circuit consists of a 10 Ω resistor and a 20 Ω resistor connected in series. If a current of 2 A flows through the circuit, calculate the voltage drop across the 20 Ω resistor.
A. 10 V
B. 20 V
C. 30 V
D. 40 V
Question 4
A light ray passes through a convex lens of focal length 20 cm. If the object dis\tance is 30 cm, calculate the image dis\tance.
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
Question 5
A block of wood with a mass of 2 kg is susp\ended from a spring with a spring cons\tant of 100 N/m. Calculate the frequency of oscillation of the block.
A. 0.5 Hz
B. 1 Hz
C. 2 Hz
D. 5 Hz
Question 6
A radioactive sample has a half-life of $t_{1/2}$. What is the decay cons\tant of the sample?
A. \frac{\ln 2}{t_{1/2}}
B. \frac{t_{1/2}}{\ln 2}
C. \frac{1}{t_{1/2}}
D. \frac{t_{1/2}}{2}
Question 7
A circuit consists of a 12 Ω resistor and a 20 Ω resistor connected in series. If a voltage of 24 V is applied across the circuit, what is the current through the 20 Ω resistor?
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 8
A 100 Ω resistor and a 200 Ω resistor are connected in parallel across a 200 V AC source. What is the current drawn from the source?
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 9
A sound wave with a frequency of 200 Hz is emitted from a source moving towards a stationary observer. If the speed of sound in air is 343 m/s, calculate the apparent frequency heard by the observer.
A. 220 Hz
B. 200 Hz
C. 180 Hz
D. 160 Hz
Question 10
A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. Calculate the speed of the wave.
A. 100 m/s
B. 200 m/s
C. 300 m/s
D. 400 m/s
Question 11
A particle of mass $m$ is confined to a one-dimensional box of length $L$. The wave function of the particle is given by $psi(x) = \sqrt{\frac{2}{L}} \sinleft\( \frac{npi x}{L}\right \)$, where $n$ is a positive integer. What is the expectation value of the position of the particle?
A. 0
B. L/2
C. L
D. nπL/2
Question 12
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance.
A. 1.6 x 10^-10 F
B. 3.2 x 10^-10 F
C. 4.8 x 10^-10 F
D. 6.4 x 10^-10 F
Question 13
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.5 m from its equilibrium position and released from rest, what is the maximum velocity of the particle?
A. 1 m/s
B. 2 m/s
C. 3 m/s
D. 4 m/s
Question 14
A 2 kg block is moving with a velocity of 10 m/s on a frictionless surface. If a force of 5 N is applied to the block, what is its acceleration?
A. 1 m/s²
B. 2 m/s²
C. 3 m/s²
D. 4 m/s²
Question 15
A 1000 Ω resistor is connected in parallel with a 2000 Ω resistor. If a 12 V battery is connected across the circuit, what is the current flowing through the 1000 Ω resistor?
A. 0.4 A
B. 0.6 A
C. 0.8 A
D. 1.2 A

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