Question # 1

High frequency radio wave is called as

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Fluctuate

Carrier wave

Matter wave

Mechanical wave

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

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

At resonance, the behavior of R-L-C series circuit is.

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Resistive

Capacitive

Inductive

Modulative

In chopke coil the resistance X_L an resistance R are:

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X_L=R

X_L<<R

X_L>>R

X_L=∞

In pure capacitor A.C. circuit, the current I and charge q are.

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In phase

Out of phase

Parallel to each other

None of above

The slope of q-t curve at any instant of time gives.

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Voltage

Current

Charge

Botha a and b

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

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

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Decreased

Increased

Becomes half

Becomes 4 times

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

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

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Positive

Negative

Zero

Infinite

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

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Inductor

Battery

Thermistor

Capacitor

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

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

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10⁶

0

10^∘

Maximum

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

At resonance frequency, the impedance of RLC series circuit is.

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Maximum

Minimum

Zero

Infinite

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

An A.C. voltmeter reads 220 V, its peak value will be

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225 V

240 V

311.12 V

300 V

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

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1/2

sigma

Zero

sigma /4

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

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

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