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

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

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

In RLC parallel circuit the resonance frequency is

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

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

A.C. through inductor, the applied voltage:

Power factor is equal to:

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

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

The flow of D.C. current is opposed by

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

Modulation can be achieved by

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

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

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

The wire receiving the waves is known as

The power factor in wattles current is

Average value of current and voltage over a complete cycle is

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

Waves we prefer for transmission of radio signals have

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

Power dissipated in pure inductor is:

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

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

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

Choke consumes extremely small:

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

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

The sum of positive and negative peak values is called:

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

The power factor of RL-series circuit is :

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

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

The most common source of A.C is:

The speed of electromagnetic wave in vacuum is given by

Which of the following electromagnetic waves have shortest wavelength?

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

Choke used to limit high frequency A.C has

The range of values of power factor is

In the modulation process, high frequency signal is called

AC can be converted into DC by:

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

The sum of positive and negative peak value is called

The reactance of an inductor is

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

The phase angle at +vc (positive) peak is

In case of capacitor, the unit of reactance is:

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

Main reasons for worldwide use of A. C is

Electromagnetic waves transport

At high frequency the value of reactance of capacitor will he

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

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

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

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

During each cycle AC voltage reaches a peak value

Choke coil in A.C circuit is used for

The waveform of alternating voltage is a:

Capacitive reactance Xc =

Impedance Z can he expressed as;

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

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

The frequency range. for F.M is given by

AC voltmeter measure

Direct current cannot flow through:

Dimensions of RC matches with

The reactance Of capacitor is equal to

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

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

Electromagnetic waves are, generated when

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

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

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

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

As a result of modulation, the resulting wave is called

Electromagnetic waves emitted from radio antenna are:

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

The power factor of an A.C circuit has.

The combined effect of resistance and reactance is known as:

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

Which one is not present in AC generator?

The range or F.M transmission frequencies is from

In alternating current, Inductors behave like

Electromagnetic waves do not transport any:

The amplitude modulated transmission waves have frequencies range:

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

AN inductor may store energy in:

In a pure inductive A.C. circuit the current

High frequency radio wave is called as:-.

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

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

Direct current cannot flow through

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

In R-L series circuit phase angle is given by

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

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

In pure RLC circuit, the energy is dissipated in:

In the modulation process, low, frequency signal is called

The frequency of AC in Pakistan is;