Question # 1

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

For electromagnetic waves, Maxwell generalized

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Gauses law for magnetism

Gauses law for eletricity

Fradays law

Amperes law

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

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

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

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

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

Electron vibrating 94,000 times each second will produce radio waves of frequency.

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94 Hz

940 HZ

94 Hz

490 Hz

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

The inductive reactance of a coil is direction proportional to.

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Inductance

Resistance

Frequency of A.C.

Both frequency of A.C. and inductance

An alternating quantity (voltage or current) is completely known if we know its:

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Maximum

Frequency and phase

Effective value

Both (a) & (b)

when an inductor comes close to a metallic object, its inductance is.

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Decreased

Increased

Becomes half

Becomes 4 times

An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is:

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50 Hz

25Hz

100 Hz

75 Hz

The AC system is preferred to DC system because:

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AC voltage can be easily changed in magnitude

DC motor angular velocity is affected badly

High voltage AC transmission is less efficient

Domestic appliance require AC voltage for their operation

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

Impedance is denoted by:

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A

Z

P

Q

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

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