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The MCQs below are drawn from the Physics subject category.
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2551
A common emitter amplifier is designed with n-p-n transistor (α = 0.99). The input impedance is 1 kΩ and load is 10 kΩ. The voltage gain will be
A. 9900
B. 990
C. 9.9
D. 99
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Correct Option
Explanation
β ≈ α/(1−α)=0.99/0.01=99; approximate voltage gain ≈ β*(RL/Rin)=99*(10k/1k)=990.
2552
A wire of resistance 36 Ω is bent in the form of an equilateral triangle. The resistance between two vertices is
A. 36 Ω
B. 12 Ω
C. 8 Ω
D. 24 Ω
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Correct Option
Explanation
Each side is 12 Ω; between two vertices one path is 12 Ω and the other is 24 Ω, so equivalent is (12||24) = 8 Ω.
2553
If there is no fourth band, tolerance is indicated as:
A. 20%
B. 10%
C. +20%
D. +5%
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Correct Option
Explanation
When the tolerance band is absent on a resistor, the default tolerance is typically around ±20% (represented as 20%).
2554
40. In the above question the current through the battery is
A. 2 A
B. 0.25 A
C. 0.5 A
D. 1 A
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Correct Option
Explanation
Total resistance ≈ 96 + 4 = 100 Ω, so I = 50 V / 100 Ω = 0.5 A.
2555
213 What is the effect on the product of resistivity and conductivity if the temperature of a conductor is increased?
A. It may increase or decrease
B. It remains the same
C. It decreases
D. It increases
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Correct Option
Explanation
Resistivity (ρ) and conductivity (σ) are reciprocals, so their product ρ·σ = 1, independent of temperature.
2556
If an input signal with non-zero DC component is applied to a low pass RC network, the DC component in the output will be ____ than that in the input.
A. Lesser
B. Equal to
C. More
D. None of these
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Correct Option
Explanation
A passive RC low-pass filter attenuates DC less than unity across practical configurations, so the DC component in the output will be reduced compared to the input.
2557
The resonance frequency is given as
A. f_r = 2π√(LC)
B. f_r = 1/(2π√(LC))
C. f_r = 1/(π√(LC))
D. f_r = 3/(2π√(LC))
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Correct Option
Explanation
The resonance (natural) frequency of an LC circuit is f_r = 1/(2π√(LC)), so option A is correct.
2558
A choke coil is a coil with
A. low inductance and low resistance
B. low inductance and negligible resistance
C. low inductance and high resistance
D. high inductance and low resistance
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Correct Option
Explanation
A choke is designed to impede AC (especially high frequencies) and therefore has high inductance and typically low resistance.
2559
An alternating voltage is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 volt and across the inductance is 150 volt, then the applied voltage is
A. 300 V
B. 350 V
C. 250 V
D. 500 V
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Correct Option
Explanation
According to the block header answer key (ocr); the OCR-provided answer is option A.
2560
What units are used to rate electrical fuses?
A. Hertz
B. Ampere
C. Volts
D. Watts
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Correct Option
Explanation
Fuses are rated by the current they can carry before blowing, so the correct unit is amperes (option B).
