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

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

Choke used to limit high frequency A.C has

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

Electromagnetic waves transport

During each cycle AC voltage reaches a peak value

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

The sum of positive and negative peak values is called:

The frequency of AC in Pakistan is;

The amplitude modulated transmission waves have frequencies range:

A.C. through inductor, the applied voltage:

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

Dimensions of RC matches with

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

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

Waves we prefer for transmission of radio signals have

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

Power factor is equal to:

The phase angle at +vc (positive) peak is

Electromagnetic waves emitted from radio antenna are:

AC can be converted into DC by:

In case of capacitor, the unit of reactance is:

Electromagnetic waves do not transport any:

Choke consumes extremely small:

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

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

Direct current cannot flow through

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

Which of the following electromagnetic waves have shortest wavelength?

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

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

The reactance Of capacitor is equal to

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

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

The combined effect of resistance and reactance is known as:

In pure RLC circuit, the energy is dissipated in:

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

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

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

In RLC parallel circuit the resonance frequency is

In the modulation process, high frequency signal is called

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

The range of values of power factor is

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

The most common source of A.C is:

The waveform of alternating voltage is a:

Main reasons for worldwide use of A. C is

Capacitive reactance Xc =

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

As a result of modulation, the resulting wave is called

In alternating current, Inductors behave like

AN inductor may store energy in:

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

AC voltmeter measure

Electromagnetic waves are, generated when

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

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

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

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

The frequency range. for F.M is given by

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

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

The range or F.M transmission frequencies is from

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

Modulation can be achieved by

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

The sum of positive and negative peak value is called

The reactance of an inductor is

The speed of electromagnetic wave in vacuum is given by

In the modulation process, low, frequency signal is called

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

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

Choke coil in A.C circuit is used for

Power dissipated in pure inductor is:

Average value of current and voltage over a complete cycle is

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

The wire receiving the waves is known as

The power factor of RL-series circuit is :

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

At high frequency the value of reactance of capacitor will he

High frequency radio wave is called as:-.

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

Which one is not present in AC generator?

The power factor of an A.C circuit has.

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

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

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

The flow of D.C. current is opposed by

Direct current cannot flow through:

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

Impedance Z can he expressed as;

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

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

In a pure inductive A.C. circuit the current

The power factor in wattles current is

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