Q. In a series RLC circuit, if the resistance is 4 ohms, inductance is 0.1 H, and capacitance is 100 μF, what is the resonant frequency? (2023)
A.
50 Hz
B.
100 Hz
C.
159.15 Hz
D.
200 Hz
Show solution
Solution
Resonant frequency f = 1/(2π√(LC)) = 1/(2π√(0.1 * 100e-6)) = 159.15 Hz.
Correct Answer:
C
— 159.15 Hz
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Q. In a series RLC circuit, if the resistance is 5Ω, inductance is 0.1H, and capacitance is 100μF, what is the resonant frequency? (2022)
A.
50Hz
B.
100Hz
C.
159Hz
D.
200Hz
Show solution
Solution
The resonant frequency f = 1/(2π√(LC)) = 1/(2π√(0.1*100e-6)) ≈ 159Hz.
Correct Answer:
C
— 159Hz
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Q. In a series RLC circuit, if the resistance is 5Ω, the inductance is 0.2H, and the capacitance is 10μF, what is the resonant frequency? (2023)
A.
50Hz
B.
100Hz
C.
159.15Hz
D.
200Hz
Show solution
Solution
Resonant frequency f0 = 1/(2π√(LC)) = 1/(2π√(0.2 * 10e-6)) = 159.15Hz.
Correct Answer:
C
— 159.15Hz
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Q. In a series RLC circuit, if the total impedance is 40 Ω, the resistance is 30 Ω, what is the inductive reactance? (2021)
A.
10 Ω
B.
20 Ω
C.
30 Ω
D.
50 Ω
Show solution
Solution
Using Z = √(R² + Xl²), we have 40 = √(30² + Xl²). Solving gives Xl = 10 Ω.
Correct Answer:
A
— 10 Ω
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Q. In a series RLC circuit, if the total impedance is 50Ω, the resistance is 30Ω, what is the inductive reactance if the capacitive reactance is 20Ω? (2023)
A.
10Ω
B.
20Ω
C.
30Ω
D.
40Ω
Show solution
Solution
Using Z = √(R² + (XL - XC)²), we find XL = √(50² - 30²) + 20 = 10Ω.
Correct Answer:
A
— 10Ω
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Q. In a series RLC circuit, what condition must be met for resonance to occur? (2021)
A.
R = 0
B.
XL = XC
C.
R = XL
D.
R = XC
Show solution
Solution
For resonance in a series RLC circuit, the condition XL = XC must be met.
Correct Answer:
B
— XL = XC
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Q. In a series RLC circuit, what happens at resonance? (2020)
A.
Impedance is minimum
B.
Current is minimum
C.
Voltage is maximum
D.
Power factor is zero
Show solution
Solution
At resonance in a series RLC circuit, the impedance is minimum, and the circuit behaves like a purely resistive circuit.
Correct Answer:
A
— Impedance is minimum
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Q. In a series RLC circuit, what happens to the current when the circuit is at resonance? (2021)
A.
It is maximum
B.
It is minimum
C.
It is zero
D.
It is constant
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Solution
At resonance in a series RLC circuit, the impedance is minimum, and thus the current is maximum.
Correct Answer:
A
— It is maximum
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Q. In a series RLC circuit, what happens to the impedance at resonance? (2021)
A.
Minimum
B.
Maximum
C.
Zero
D.
Infinite
Show solution
Solution
At resonance in a series RLC circuit, the impedance is at a minimum.
Correct Answer:
A
— Minimum
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Q. In a series RLC circuit, what happens to the total impedance when the circuit is at resonance? (2022)
A.
It is minimum
B.
It is maximum
C.
It is equal to R
D.
It is equal to L
Show solution
Solution
At resonance in a series RLC circuit, the total impedance is minimum and is equal to the resistance (R) of the circuit.
Correct Answer:
C
— It is equal to R
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Q. In a simple cubic lattice, how many atoms are effectively present in one unit cell? (2019)
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Solution
In a simple cubic lattice, there is 1 atom effectively present in one unit cell, as each corner atom contributes 1/8th of an atom to the unit cell.
Correct Answer:
A
— 1
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Q. In a simple cubic lattice, how many atoms are present in one unit cell? (2019)
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Solution
In a simple cubic lattice, there is 1 atom per unit cell (1/8 atom from each of the 8 corners).
Correct Answer:
A
— 1
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Q. In a simple harmonic motion, the acceleration is always directed towards which point? (2022)
A.
Equilibrium point
B.
Maximum displacement
C.
Minimum displacement
D.
None of the above
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Solution
In simple harmonic motion, the acceleration is always directed towards the equilibrium point, which is the position of rest.
Correct Answer:
A
— Equilibrium point
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Q. In a simple harmonic motion, the maximum velocity occurs at which point? (2019)
A.
At the mean position
B.
At the extreme position
C.
At half the amplitude
D.
At the equilibrium position
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Solution
Maximum velocity occurs at the mean position where the displacement is zero.
Correct Answer:
A
— At the mean position
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Q. In a simple harmonic motion, the restoring force is directly proportional to the displacement. What is the nature of this force? (2022)
A.
Conservative
B.
Non-conservative
C.
Frictional
D.
Centrifugal
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Solution
The restoring force in SHM is a conservative force as it can do work and store energy.
Correct Answer:
A
— Conservative
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Q. In a simple harmonic oscillator, if the mass is doubled, what happens to the time period? (2022)
A.
It remains the same
B.
It doubles
C.
It increases by √2
D.
It decreases by √2
Show solution
Solution
Time period (T) = 2π√(m/k), doubling m will double T.
Correct Answer:
B
— It doubles
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Q. In a simple harmonic oscillator, if the mass is increased, what happens to the time period? (2019)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on amplitude
Show solution
Solution
Time period (T) = 2π√(m/k). If mass (m) increases, T increases.
Correct Answer:
A
— Increases
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Q. In a standing wave, what are the points called where there is no displacement? (2020)
A.
Nodes
B.
Antinodes
C.
Crests
D.
Troughs
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Solution
In a standing wave, the points where there is no displacement are called nodes.
Correct Answer:
A
— Nodes
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Q. In a test cross, an individual of unknown genotype is crossed with which of the following? (2021)
A.
Homozygous dominant
B.
Heterozygous
C.
Homozygous recessive
D.
Any individual
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Solution
A test cross is performed by crossing an individual of unknown genotype with a homozygous recessive individual.
Correct Answer:
C
— Homozygous recessive
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Q. In a test cross, an individual with a dominant phenotype is crossed with which of the following? (2021)
A.
Homozygous dominant
B.
Homozygous recessive
C.
Heterozygous
D.
None of the above
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Solution
In a test cross, an individual with a dominant phenotype is crossed with a homozygous recessive individual to determine its genotype.
Correct Answer:
B
— Homozygous recessive
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Q. In a test cross, an individual with an unknown genotype is crossed with which of the following? (2023)
A.
Homozygous dominant
B.
Heterozygous
C.
Homozygous recessive
D.
Any individual
Show solution
Solution
In a test cross, the individual with an unknown genotype is crossed with a homozygous recessive individual.
Correct Answer:
C
— Homozygous recessive
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Q. In a thin film interference experiment, what type of interference occurs when light reflects off a denser medium? (2023)
A.
Constructive interference
B.
Destructive interference
C.
No interference
D.
Total internal reflection
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Solution
When light reflects off a denser medium, a phase change of π occurs, leading to destructive interference for certain path differences.
Correct Answer:
B
— Destructive interference
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Q. In a thin film interference, if the film is viewed in white light, which color will be seen at the center of the film? (2022)
A.
Red
B.
Blue
C.
Green
D.
Yellow
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Solution
At the center of a thin film, constructive interference occurs for longer wavelengths (red light), making red the dominant color seen.
Correct Answer:
A
— Red
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Q. In a thin film of air between two glass plates, which of the following colors will be least affected by interference? (2022)
A.
Red
B.
Green
C.
Blue
D.
Violet
Show solution
Solution
Red light has the longest wavelength and is least affected by interference effects in thin films compared to shorter wavelengths.
Correct Answer:
A
— Red
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Q. In a thin film of oil on water, what color will be seen if the film thickness is such that destructive interference occurs for blue light? (2021)
A.
Red
B.
Green
C.
Blue
D.
Yellow
Show solution
Solution
If destructive interference occurs for blue light, the color seen will be the complementary color, which is red.
Correct Answer:
A
— Red
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Q. In a thin film of oil on water, which color of light is most likely to be reflected? (2022)
A.
Red
B.
Blue
C.
Green
D.
Yellow
Show solution
Solution
Due to the phenomenon of thin film interference, the color that is most prominently reflected depends on the thickness of the film and the wavelength of light. Typically, blue light is more likely to be reflected due to shorter wavelengths.
Correct Answer:
B
— Blue
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Q. In a thin film of oil on water, which color will appear at the center of the pattern if the film thickness is such that it causes constructive interference for red light? (2022)
A.
Red
B.
Blue
C.
Green
D.
Yellow
Show solution
Solution
The color that appears at the center of the pattern corresponds to the wavelength that experiences constructive interference, which in this case is red light.
Correct Answer:
A
— Red
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Q. In a thin film of oil on water, which color will appear at the center of the pattern if the film thickness is such that it causes constructive interference for blue light? (2022)
A.
Red
B.
Green
C.
Blue
D.
Yellow
Show solution
Solution
If the film thickness causes constructive interference for blue light, blue will appear at the center of the pattern.
Correct Answer:
C
— Blue
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Q. In a thin film of oil on water, which color will appear at the center of the pattern if the film thickness is such that it causes destructive interference for red light? (2022)
A.
Blue
B.
Green
C.
Yellow
D.
Red
Show solution
Solution
Destructive interference for red light means red light is canceled out, leaving the shorter wavelengths (blue) visible.
Correct Answer:
A
— Blue
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Q. In a thin film of oil on water, which color will appear at the center of the pattern if the film is viewed in white light? (2022)
A.
Red
B.
Blue
C.
Green
D.
Yellow
Show solution
Solution
At the center of the thin film interference pattern, the color that appears is typically green due to the constructive interference of wavelengths in that range.
Correct Answer:
C
— Green
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