PHYSICS 2nd Year MCQs Chapter No.5 ALTERNATING CURRENT Online MDCAT & ECAT Preparation Test No.1

The reactance of a capacitor at 50Hz is 10 Ohm Which of the following will be its reactance at 100 Hz?

For frequency modulated signal, the frequency of the modulated carrier wave is at its normal value when the signal amplitude is at its

High frequency radio wave is called as:-.

Electromagnetic waves are, generated when

AC can be converted into DC by:

In the modulation process, low, frequency signal is called

Which of the following radiations forms the part of electromagnetic spectrum?

When electrons in a transmitting antenna vibrate 94000 times each having frequency:

The power factor of an A.C circuit has.

In pure RLC circuit, the energy is dissipated in:

The phase difference between current and voltage in an Inductive circuit is

The sum of positive and negative peak value is called

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

The peak value of A.C is 2?2 A Which of the following will be its apparent value?

The frequency modulation (F.M.) transmission, frequencies range from

The sum of positive and negative peak values is called:

The amplitude modulated transmission waves have frequencies range:

Electromagnetic waves emitted from radio antenna are:

The phase angle between the voltage and current through resistor is:

Phase difference between V and I of an A. C through resistor is

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

The effective value of A.C in a circuit is 10A Which of the following will be its peak value.

For frequency modulated signal, the frequency of the modulated carrier wave is highest when the signal amplitude is at its

AC voltmeter measure

The reactance of an inductor is

The phase angle at +vc (positive) peak is

Dimensions of RC matches with

The frequency of the range 20 to.20,000 Iii is:

In alternating current, Inductors behave like

Waves we prefer for transmission of radio signals have

100 μf capacitor is connected to an AC-voltage of 24 V and frequency of 50 Hz. The reactance of the capacitor is

In R-L series circuit phase angle is given by

The opposition offered by a capacitor.to the flow of an A. C is called

The frequency of AC in Pakistan is;

The impedance. Of RLC series circuit at, resonance is equal to;

Power factor is equal to:

In our radio receiver set, when we change station, or change the frequency we actually adjust the :due of

The flow of D.C. current is opposed by

The power factor in wattles current is

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance's is:

Choke consumes extremely small:

The frequency of electromagnetic waves received through a LC - circuit is adjusted by

Impedance Z can he expressed as;

The amplitude modulation (A.M.) transmission, frequencies range from

A.C. through inductor, the applied voltage:

Power dissipated in pure inductor is:

The wire receiving the waves is known as

The range or F.M transmission frequencies is from

The frequency range. for F.M is given by

For frequency modulated signal, the frequency of the modulated carrier wave is lowest when the signal amplitude is at its

The velocity of an oscillating charge as it moves to and fro along the wire is

The piece of wire through which charges are made to accelerate by mean o me waves is known as

The combined effect of resistance and reactance is known as:

The speed of electromagnetic wave in vacuum is given by

During each cycle AC voltage reaches a peak value

In RLC parallel circuit the resonance frequency is

In the modulation process, high frequency signal is called

If E and B be electric and magnetic field vectors of an electromagnetic wave, Then propagation of wave then propagation of wave is along the direction of

Electromagnetic waves transport

In RIC series circuit Xl=Xc Which of the following will be the power factor?

The velocity of an oscillating charge as it moves to and fro along a wire is:

The power factor of RL-series circuit is :

In an electromagnetic waves, the electric and magnetic field are:

In tuning circuit if capacitance is doubled and inductance is halved then its frequency

Choke coil in A.C circuit is used for

Which of the following is the time taken by an A.C of frequency 50 Hz to complete one cycle?

The highest value reached by the Voltage or current in one cycle is called;

The range of values of power factor is

When we accelerate the charges, which type of waves are produced.

The basic circuit element in a D.0 circuit which controls the current and voltage is

Electromagnetic waves do not transport any:

At high frequency the value of reactance of capacitor will he

Which of the following electromagnetic waves have shortest wavelength?

Main reasons for worldwide use of A. C is

In R-L-C Circuit, the energy is dissipated in:

The frequency of A.C. source used in Pakistan is;

The waveform of alternating voltage is a:

Modulation can be achieved by

The process of combining the low frequency signal with a high frequency signal is called

Capacitive reactance Xc =

In a pure inductive A.C. circuit the current

Which one is not present in AC generator?

In three phase AC generator the phase difference between each pair of coil is:

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

An electric bulb is designed to operate at 12V DC. It is connected to AC and gives same brightness then peak AC value of voltage is

The sharpness of resonance RLC series resonant circuit, as the resistance of the circuit is increased,

Average value of current and voltage over a complete cycle is

Direct current cannot flow through:

The mean value of A.C. in a cycle is :

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

AN inductor may store energy in:

At resonance frequency, the impedance of RLC - Parallel Circuit is

The reactance Of capacitor is equal to

As a result of modulation, the resulting wave is called

The most common source of A.C is:

In case of capacitor, the unit of reactance is:

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

Direct current cannot flow through

Choke used to limit high frequency A.C has