Question # 1

For electromagnetic waves, Maxwell generalized

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Gauses law for magnetism

Gauses law for eletricity

Fradays law

Amperes law

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

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Half

Two

Four times

One fourth

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

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

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Zero

1

-1

2

At high frequency the value of reactance of capacitor will be.

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Small

Zero

Large

Infinite

The main use of A.C is

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Minimum line losses

Long distance transmission

Stepping up to required voltage only

Steeping down to required voltage only

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

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

In the capacitive circuit of A.C. quantity when q= 0 the slope of q-t curve is.

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Maximum

Minimum

Zero

Negative

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

The electromagnetic spectrum contains

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Radio waves

X-rays

Microwaves

All of these

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

In Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

Power dissipation in A.C circuit is expressed as:

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P =I_rms x V_rms Sinθ

IxVCosθ

I_rmsxV_rmsCosθ

I_rms x V_rms Sin2θ

In LR circiut which one of the following statements is correct?

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L and R opposes each other

R value increases with frequency

The inductive reactance increases with frequency

The inductive reactance decreases with frequency

Which consumes small power.

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Inductor

Resistor

Motor

All of these

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

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

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