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

AC voltmeter measure

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

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

As a result of modulation, the resulting wave is called

Waves we prefer for transmission of radio signals have

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

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

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

Capacitive reactance Xc =

The sum of positive and negative peak value 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 flow of D.C. current is opposed by

A.C. through inductor, the applied voltage:

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

Dimensions of RC matches with

In RLC parallel circuit the resonance frequency is

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

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

The waveform of alternating voltage is a:

In pure RLC circuit, the energy is dissipated in:

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

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

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

Direct current cannot flow through:

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

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

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

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

Electromagnetic waves transport

Direct current cannot flow through

In the modulation process, high frequency signal is called

In the modulation process, low, frequency signal is called

The reactance of an inductor is

Power dissipated in pure inductor is:

At high frequency the value of reactance of capacitor will he

AN inductor may store energy in:

Average value of current and voltage over a complete cycle is

The speed of electromagnetic wave in vacuum is given by

In case of capacitor, the unit of reactance is:

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

Modulation can be achieved by

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

Electromagnetic waves do not transport any:

The frequency range. for F.M is given by

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

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

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

Power factor is equal to:

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

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

The power factor in wattles current is

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

AC can be converted into DC by:

The sum of positive and negative peak values is called:

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

Electromagnetic waves are, generated when

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

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

Which one is not present in AC generator?

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

The most common source of A.C is:

The power factor of RL-series circuit is :

The range or F.M transmission frequencies is from

Impedance Z can he expressed as;

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

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

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

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 reactance Of capacitor is equal to

In alternating current, Inductors behave like

The range of values of power factor is

The frequency of AC in Pakistan is;

Which of the following electromagnetic waves have shortest wavelength?

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

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

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 R-L series circuit phase angle is given by

The phase angle at +vc (positive) peak is

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

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

The amplitude modulated transmission waves have frequencies range:

In a pure inductive A.C. circuit the current

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

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

Choke consumes extremely small:

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

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

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

The combined effect of resistance and reactance is known as:

Choke used to limit high frequency A.C has

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 power factor of an A.C circuit has.

Main reasons for worldwide use of A. C is

High frequency radio wave is called as:-.

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

During each cycle AC voltage reaches a peak value

The wire receiving the waves is known as