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

Electromagnetic waves transport

The power factor of an A.C circuit has.

AN inductor may store energy in:

During each cycle AC voltage reaches a peak value

The sum of positive and negative peak value is called

Which of the following electromagnetic waves have shortest wavelength?

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

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

The combined effect of resistance and reactance is known as:

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

The wire receiving the waves is known as

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

A.C. through inductor, the applied voltage:

Impedance Z can he expressed as;

Power dissipated in pure inductor is:

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

In the modulation process, high frequency signal is called

Power factor is equal to:

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

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

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

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

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

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

Choke coil in A.C circuit is used for

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

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

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 reactance of an inductor is

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 radiations forms the part of electromagnetic spectrum?

Average value of current and voltage over a complete cycle is

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

In alternating current, Inductors behave like

In RLC parallel circuit the resonance frequency is

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

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

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

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

The sum of positive and negative peak values is called:

Direct current cannot flow through:

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

The waveform of alternating voltage is a:

Choke consumes extremely small:

In R-L series circuit phase angle is given by

In the modulation process, low, frequency signal is called

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

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

Direct current cannot flow through

In pure RLC circuit, the energy is dissipated in:

The power factor in wattles current is

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

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

Capacitive reactance Xc =

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

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

The speed of electromagnetic wave in vacuum is given by

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

AC voltmeter measure

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,

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

High frequency radio wave is called as:-.

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

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

The power factor of RL-series circuit is :

AC can be converted into DC by:

The most common source of A.C is:

Electromagnetic waves are, generated when

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

Dimensions of RC matches with

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

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

The range or F.M transmission frequencies is from

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

The flow of D.C. current is opposed by

Electromagnetic waves do not transport any:

The phase angle at +vc (positive) peak is

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

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

The frequency range. for F.M is given by

In a pure inductive A.C. circuit the current

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

Main reasons for worldwide use of A. C is

The frequency of AC in Pakistan is;

Which one is not present in AC generator?

The amplitude modulated transmission waves have frequencies range:

At high frequency the value of reactance of capacitor will he

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

As a result of modulation, the resulting wave is called

Choke used to limit high frequency A.C has

Modulation can be achieved by

Waves we prefer for transmission of radio signals have

The reactance Of capacitor is equal to

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

The range of values of power factor is

Electromagnetic waves emitted from radio antenna are:

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

In case of capacitor, the unit of reactance is: