Question # 1

An electromagnetic wave goes from air to glass which of the following does not change?

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Radio waves

X-rays

Ultra violet radiation

Ultra sond waves

In case of A.C. through resistor V and I are

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At 0^o with each other

At 180 ^o with each other

At 90^o with each other

At 270 ^o with each other

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 metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

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 Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

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

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

The highest value reached by the voltage or current in one cycle is called.

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Peak ot peak value

Peak value

Instantaneous value

Root mean square value

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

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

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Zero

1

-1

2

In purely resistive A.C circuit, instantaneous value of voltage and current:

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Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

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

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1/2

sigma

Zero

sigma /4

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

In three phase A.C supply coils are inclined at an angle of.

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0^o

90^o

120^o

80^o

The internal resistance of a capacitor is called:

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Impedance

Resistance

Reactance

Conductance

Power dissipation is a pure inductive or in a pure capacitance circuit is:

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10⁶

0

10^∘

Maximum

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