Q. In an RLC circuit, if the inductive reactance is 10Ω and capacitive reactance is 5Ω, what is the net reactance? (2020)
A.
5Ω
B.
10Ω
C.
15Ω
D.
0Ω
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Solution
Net reactance = XL - XC = 10Ω - 5Ω = 5Ω.
Correct Answer: A — 5Ω
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Q. In an RLC circuit, if the inductive reactance is 30Ω and capacitive reactance is 20Ω, what is the net reactance? (2020)
A.
10Ω
B.
50Ω
C.
30Ω
D.
20Ω
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Solution
Net reactance X = XL - XC = 30Ω - 20Ω = 10Ω.
Correct Answer: A — 10Ω
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Q. In an RLC circuit, if the resistance is 10Ω, the inductance is 0.1H, and the capacitance is 20μF, what is the total impedance at 50Hz? (2022)
A.
10Ω
B.
15.81Ω
C.
20Ω
D.
25Ω
Show solution
Solution
Calculate XL = 2πfL = 31.42Ω and XC = 1/(2πfC) = 159.15Ω. Z = √(R² + (XL - XC)²) = √(10² + (31.42 - 159.15)²) = 15.81Ω.
Correct Answer: B — 15.81Ω
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Q. In an RLC circuit, if the resistance is 6Ω, inductive reactance is 8Ω, and capacitive reactance is 4Ω, what is the total impedance? (2021)
A.
10Ω
B.
12Ω
C.
14Ω
D.
16Ω
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Solution
Total impedance Z = √(R² + (XL - XC)²) = √(6² + (8 - 4)²) = √(36 + 16) = √52 ≈ 10Ω.
Correct Answer: B — 12Ω
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Q. In an RLC circuit, if the resistance is increased while keeping the inductance and capacitance constant, what happens to the bandwidth?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
The bandwidth (Δf) of an RLC circuit is inversely proportional to the resistance (R). Increasing R decreases the bandwidth.
Correct Answer: B — Decreases
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Q. In an RLC circuit, if the resistance is increased, what happens to the quality factor (Q)? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
The quality factor Q is inversely proportional to resistance. Increasing resistance decreases Q.
Correct Answer: B — Decreases
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Q. In an RLC circuit, what does the term 'resonance' refer to? (2019)
A.
Maximum current at a specific frequency
B.
Minimum current at any frequency
C.
Constant voltage
D.
Zero inductance
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Solution
Resonance in an RLC circuit occurs when the inductive reactance equals the capacitive reactance, resulting in maximum current at a specific frequency.
Correct Answer: A — Maximum current at a specific frequency
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Q. In an RLC circuit, what happens to the impedance at resonance? (2023)
A.
Minimum
B.
Maximum
C.
Zero
D.
Infinite
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Solution
At resonance, the impedance in an RLC circuit is at a minimum.
Correct Answer: A — Minimum
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Q. In an RLC circuit, what happens to the impedance when the circuit is at resonance? (2023)
A.
Minimum
B.
Maximum
C.
Zero
D.
Infinite
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Solution
At resonance, the impedance of an RLC circuit is at its minimum.
Correct Answer: A — Minimum
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Q. In an RLC circuit, what is the condition for resonance?
A.
XL = XC
B.
R = 0
C.
L = C
D.
f = 0
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Solution
Resonance occurs when the inductive reactance (XL) equals the capacitive reactance (XC).
Correct Answer: A — XL = XC
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Q. In an RLC series circuit, if the inductive reactance is greater than the capacitive reactance, the circuit is said to be: (2022)
A.
Resonant
B.
Inductive
C.
Capacitive
D.
Purely resistive
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Solution
If the inductive reactance (XL) is greater than the capacitive reactance (XC), the circuit is inductive.
Correct Answer: B — Inductive
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Q. In an RLC series circuit, if the resistance is 10 Ω, inductance is 0.1 H, and capacitance is 100 μF, what is the resonant frequency? (2023)
A.
50 Hz
B.
100 Hz
C.
159 Hz
D.
200 Hz
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Solution
The resonant frequency f0 = 1/(2π√(LC)) = 1/(2π√(0.1 * 100e-6)) = 159 Hz.
Correct Answer: C — 159 Hz
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Q. In an RLC series circuit, if the resistance is 10 Ω, the inductance is 0.1 H, and the capacitance is 100 μF, what is the resonant frequency? (2023)
A.
50 Hz
B.
100 Hz
C.
159 Hz
D.
200 Hz
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Solution
The resonant frequency f0 = 1/(2π√(LC)) = 1/(2π√(0.1 * 100e-6)) = 159 Hz.
Correct Answer: C — 159 Hz
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Q. In an RLC series circuit, if the resistance is 10Ω, the inductance is 0.1H, and the capacitance is 100μF, what is the resonant frequency? (2020)
A.
50 Hz
B.
100 Hz
C.
159 Hz
D.
200 Hz
Show solution
Solution
Using f = 1/(2π√(LC)), we find f = 1/(2π√(0.1 * 100e-6)) ≈ 159 Hz.
Correct Answer: C — 159 Hz
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Q. In an RLC series circuit, if the resistance is increased while keeping the inductance and capacitance constant, what happens to the quality factor (Q)?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The quality factor (Q) is given by Q = (1/R)√(L/C). Increasing R decreases Q.
Correct Answer: B — Decreases
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Q. In an RLC series circuit, if the total impedance is 20Ω and the resistance is 15Ω, what is the reactance? (2022)
A.
5Ω
B.
10Ω
C.
15Ω
D.
20Ω
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Solution
Using Z = √(R² + X²), we find X = √(Z² - R²). Here, Z = 20Ω, R = 15Ω.
Correct Answer: A — 5Ω
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Q. In an RLC series circuit, if the total impedance is 20Ω and the resistance is 15Ω, what is the inductive reactance? (2022)
A.
5Ω
B.
10Ω
C.
15Ω
D.
20Ω
Show solution
Solution
Using Z = √(R² + (XL)²), solve for XL.
Correct Answer: A — 5Ω
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Q. In an RLC series circuit, if the total impedance is 50 ohms and the resistance is 30 ohms, what is the reactance? (2020)
A.
40 ohms
B.
30 ohms
C.
20 ohms
D.
10 ohms
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Solution
Using Z = √(R² + X²), we find X = √(Z² - R²) = √(50² - 30²) = √(2500 - 900) = √1600 = 40 ohms.
Correct Answer: A — 40 ohms
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Q. In an RLC series circuit, what happens to the impedance at resonance? (2020)
A.
It is minimum
B.
It is maximum
C.
It is zero
D.
It is equal to resistance
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Solution
At resonance in an RLC series circuit, the impedance is equal to the resistance.
Correct Answer: D — It is equal to resistance
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Q. In an RLC series circuit, what is the condition for resonance?
A.
XL = XC
B.
R = 0
C.
XL > XC
D.
R > XL
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Solution
Resonance in an RLC series circuit occurs when the inductive reactance (X_L) equals the capacitive reactance (X_C), i.e., X_L = X_C.
Correct Answer: A — XL = XC
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Q. In angiosperms, the ovary develops into which of the following structures? (2023)
A.
Seed
B.
Fruit
C.
Flower
D.
Leaf
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Solution
In angiosperms, the ovary develops into a fruit, which contains the seeds.
Correct Answer: B — Fruit
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Q. In beta decay, which particle is emitted from the nucleus?
A.
Alpha particle
B.
Beta particle
C.
Gamma ray
D.
Neutron
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Solution
In beta decay, a beta particle (which is an electron or positron) is emitted from the nucleus.
Correct Answer: B — Beta particle
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Q. In Biot-Savart Law, what does the term 'dL' represent?
A.
Element of current
B.
Element of length
C.
Element of magnetic field
D.
Element of charge
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Solution
In Biot-Savart Law, 'dL' represents an infinitesimal element of length along the current-carrying conductor.
Correct Answer: B — Element of length
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Q. In constraint-based distribution, what is meant by 'degrees of freedom'? (2019)
A.
The number of independent movements allowed
B.
The total energy in the system
C.
The mass of the objects involved
D.
The speed of the system
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Solution
Degrees of freedom refer to the number of independent movements or parameters that can vary in a system.
Correct Answer: A — The number of independent movements allowed
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Q. In converting the hexadecimal number 1A to decimal, what is the result?
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Solution
The hexadecimal number 1A converts to decimal as 1*16^1 + 10*16^0 = 26.
Correct Answer: A — 26
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Q. In digital communication, what does the term 'bit rate' refer to?
A.
The number of bits transmitted per second
B.
The number of bits stored in a device
C.
The number of bits in a signal
D.
The number of bits required for modulation
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Solution
Bit rate is defined as the number of bits transmitted per second in a digital communication system.
Correct Answer: A — The number of bits transmitted per second
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Q. In double-slit diffraction, what is the effect of increasing the distance between the slits on the fringe width?
A.
Fringe width increases
B.
Fringe width decreases
C.
Fringe width remains constant
D.
Fringe width becomes zero
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Solution
Increasing the distance between the slits increases the fringe width because the angle of diffraction increases.
Correct Answer: A — Fringe width increases
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Q. In double-slit diffraction, what is the path difference for constructive interference at the first order maximum?
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Solution
For constructive interference, the path difference must be an integer multiple of the wavelength, so for the first order maximum, it is λ.
Correct Answer: B — λ
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Q. In ecological succession, what is the term for the first species to colonize a barren environment? (2022)
A.
Pioneer species
B.
Climax community
C.
Keystone species
D.
Invasive species
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Solution
Pioneer species are the first organisms to colonize previously uninhabited or disturbed environments.
Correct Answer: A — Pioneer species
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Q. In electrochemistry, what does the term 'reduction' refer to?
A.
Loss of electrons
B.
Gain of electrons
C.
Loss of protons
D.
Gain of protons
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Solution
Reduction refers to the gain of electrons in a chemical reaction.
Correct Answer: B — Gain of electrons
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