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

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

AC voltmeter measure

In the modulation process, low, frequency signal is called

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

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

High frequency radio wave is called as:-.

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

Choke consumes extremely small:

During each cycle AC voltage reaches a peak value

As a result of modulation, the resulting wave is called

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

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

Direct current cannot flow through

The phase angle at +vc (positive) peak is

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

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

The speed of electromagnetic wave in vacuum is given by

The reactance Of capacitor is equal to

Electromagnetic waves do not transport any:

Choke coil in A.C circuit is used for

Main reasons for worldwide use of A. C is

In pure RLC circuit, the energy is dissipated in:

Average value of current and voltage over a complete cycle is

The flow of D.C. current is opposed by

The amplitude modulated transmission waves have frequencies range:

Waves we prefer for transmission of radio signals have

The frequency of AC in Pakistan is;

The most common source of A.C is:

The sum of positive and negative peak value is called

In a pure inductive A.C. circuit the current

In alternating current, Inductors behave like

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

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

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

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

Electromagnetic waves are, generated when

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

Direct current cannot flow through:

Dimensions of RC matches with

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

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

The reactance of an inductor is

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

Capacitive reactance Xc =

Power dissipated in pure inductor is:

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

At high frequency the value of reactance of capacitor will he

The sum of positive and negative peak values is called:

The range or F.M transmission frequencies is from

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

AC can be converted into DC by:

The wire receiving the waves is known as

Electromagnetic waves emitted from radio antenna are:

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 phase angle between the voltage and current through resistor is:

In R-L series circuit phase angle is given by

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

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

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

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

A.C. through inductor, the applied voltage:

In RLC parallel circuit the resonance frequency is

Choke used to limit high frequency A.C has

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

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

The range of values of power factor is

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

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.

Electromagnetic waves transport

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

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

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

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

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

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

The power factor of an A.C circuit has.

In case of capacitor, the unit of reactance is:

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

The waveform of alternating voltage is a:

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

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

The combined effect of resistance and reactance is known as:

Which one is not present in AC generator?

AN inductor may store energy in:

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

The power factor of RL-series circuit is :

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

Impedance Z can he expressed as;

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

The power factor in wattles current is

Which of the following electromagnetic waves have shortest wavelength?

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

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

Power factor is equal to:

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