Question # 1

The device which allows only the continuous flow of AC through it is.

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Inductor

Battery

Thermistor

Capacitor

The expression P = VI hold only when current and voltage are.

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In phase

Out of phase

At right angle to each other

At angle of 120 ^o

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

Average value of current and voltage over a complete cycle is.

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Positive

Negative

Zero

Infinite

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

The condition of resonance is:

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XL = 1/2 Xc

X_L = X_c

X_c = 4_x2

None of above

An inductor of 1 henry inductance has a reactance 500 ohms, then the frequency required is approximately

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50 Hz

100 Hz

80 Hz

120 Hz

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

The phase angle of a series RLC circult at resonant frequency is

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1/2

sigma

Zero

sigma /4

The reactance of inductor depends upon

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L

All of the above

Choke consumes extremely small

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Current

Charge

Power

Potential

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

The electromagnetic spectrum contains

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Radio waves

X-rays

Microwaves

All of these

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Physics FSC Part 2 Chapter 16 Online MCQ's Test MCQs With Answers

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