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

Main reasons for worldwide use of A. C is

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

The speed of electromagnetic wave in vacuum is given by

Power dissipated in pure inductor is:

Impedance Z can he expressed as;

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

In RLC parallel circuit the resonance frequency is

Electromagnetic waves are, generated when

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

Which of the following electromagnetic waves have shortest wavelength?

Choke coil in A.C circuit is used for

The frequency range. for F.M is given by

The wire receiving the waves is known as

Average value of current and voltage over a complete cycle is

Modulation can be achieved by

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

In case of capacitor, the unit of reactance is:

Electromagnetic waves transport

During each cycle AC voltage reaches a peak value

The range of values of power factor is

A.C. through inductor, the applied voltage:

Power factor is equal to:

As a result of modulation, the resulting wave is called

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

Waves we prefer for transmission of radio signals have

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

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

AN inductor may store energy in:

In pure RLC circuit, the energy is dissipated in:

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

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

In R-L series circuit phase angle is given by

The range or F.M transmission frequencies is from

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

Direct current cannot flow through

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

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

The sum of positive and negative peak values is called:

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

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

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

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

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

The most common source of A.C is:

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

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

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

Dimensions of RC matches with

The power factor of an A.C circuit has.

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

Electromagnetic waves do not transport any:

The sum of positive and negative peak value is called

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

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

Electromagnetic waves emitted from radio antenna are:

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

The power factor of RL-series circuit is :

The amplitude modulated transmission waves have frequencies range:

The flow of D.C. current is opposed by

Direct current cannot flow through:

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

The phase angle at +vc (positive) peak is

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

The power factor in wattles current is

Capacitive reactance Xc =

In the modulation process, low, frequency signal is called

The frequency of AC in Pakistan is;

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

Choke consumes extremely small:

The combined effect of resistance and reactance is known as:

At high frequency the value of reactance of capacitor will he

In alternating current, Inductors behave like

AC can be converted into DC by:

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

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

The waveform of alternating voltage is a:

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

High frequency radio wave is called as:-.

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

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 one is not present in AC generator?

In the modulation process, high frequency signal is called

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

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

AC voltmeter measure

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

The reactance Of capacitor is equal to

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

In a pure inductive A.C. circuit the current

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

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

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

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

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

Choke used to limit high frequency A.C has

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

The reactance of an inductor is