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

Impedance Z can he expressed as;

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

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

The most common source of A.C is:

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

In RLC parallel circuit the resonance frequency is

The wire receiving the waves is known as

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

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

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

Waves we prefer for transmission of radio signals have

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

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

The sum of positive and negative peak values is called:

Which of the following electromagnetic waves have shortest wavelength?

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

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

Electromagnetic waves do not transport any:

The flow of D.C. current is opposed by

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

The reactance Of capacitor is equal to

The range of values of power factor is

In the modulation process, 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

AN inductor may store energy in:

Direct current cannot flow through

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

The power factor in wattles current is

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

The range or F.M transmission frequencies is from

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

Choke coil in A.C circuit is used for

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

A.C. through inductor, the applied voltage:

Which one is not present in AC generator?

Average value of current and voltage over a complete cycle is

At high frequency the value of reactance of capacitor will he

The sum of positive and negative peak value is called

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

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

The phase angle at +vc (positive) peak is

The speed of electromagnetic wave in vacuum is given by

The frequency range. for F.M is given by

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

At resonance frequency, the impedance of RLC - Parallel Circuit 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

The power factor of RL-series circuit is :

Electromagnetic waves are, generated when

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

The reactance of an inductor 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 amplitude modulated transmission waves have frequencies range:

The waveform of alternating voltage is a:

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

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

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

During each cycle AC voltage reaches a peak value

AC voltmeter measure

In a pure inductive A.C. circuit the current

Main reasons for worldwide use of A. C is

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

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

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

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

AC can be converted into DC by:

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

In R-L series circuit phase angle is given by

Choke consumes extremely small:

In alternating current, Inductors behave like

Power dissipated in pure inductor is:

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

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

The combined effect of resistance and reactance is known as:

Dimensions of RC matches with

Choke used to limit high frequency A.C has

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

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

Power factor is equal to:

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

High frequency radio wave is called as:-.

Electromagnetic waves emitted from radio antenna are:

In the modulation process, low, frequency signal is called

Electromagnetic waves transport

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

In pure RLC circuit, the energy is dissipated in:

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

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

Direct current cannot flow through:

The power factor of an A.C circuit has.

In case of capacitor, the unit of reactance is:

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

The frequency of AC in Pakistan is;

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

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

Modulation can be achieved by

Capacitive reactance Xc =

As a result of modulation, the resulting wave is called

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