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

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

The waveform of alternating voltage is a:

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

In the modulation process, high frequency signal is called

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

The amplitude modulated transmission waves have frequencies range:

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

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

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

At high frequency the value of reactance of capacitor will he

The power factor of an A.C circuit has.

Electromagnetic waves transport

The wire receiving the waves is known as

The most common source of A.C is:

In alternating current, Inductors behave like

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

Waves we prefer for transmission of radio signals have

In pure RLC circuit, the energy is dissipated in:

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

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

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

Choke used to limit high frequency A.C has

In case of capacitor, the unit of reactance is:

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

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

The speed of electromagnetic wave in vacuum is given by

In a pure inductive A.C. circuit the current

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

Power dissipated in pure inductor is:

The flow of D.C. current is opposed by

The power factor of RL-series circuit is :

Capacitive reactance Xc =

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

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

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

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

Electromagnetic waves do not transport any:

Choke consumes extremely small:

The frequency range. for F.M is given by

Main reasons for worldwide use of A. C is

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

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

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

In R-L-C 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 range or F.M transmission frequencies is from

Direct current cannot flow through:

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

Modulation can be achieved by

Choke coil in A.C circuit is used for

As a result of modulation, the resulting wave 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 frequency of the range 20 to.20,000 Iii is:

The range of values of power factor is

During each cycle AC voltage reaches a peak value

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

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

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

The phase angle at +vc (positive) peak is

Which of the following electromagnetic waves have shortest wavelength?

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

Electromagnetic waves are, generated when

The frequency of AC in Pakistan is;

AC can be converted into DC by:

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

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

Electromagnetic waves emitted from radio antenna are:

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

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

The reactance Of capacitor is equal to

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;

Power factor is equal to:

Dimensions of RC matches with

Direct current cannot flow through

Impedance Z can he expressed as;

The sum of positive and negative peak values is called:

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

In RLC parallel circuit the resonance frequency is

The power factor in wattles current is

Average value of current and voltage over a complete cycle is

In R-L series circuit phase angle is given by

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

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

In the modulation process, low, frequency signal is called

The sum of positive and negative peak value is called

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

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

A.C. through inductor, the applied voltage:

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

AC voltmeter measure

The combined effect of resistance and reactance is known as:

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

The reactance of an inductor is

Which one is not present in AC generator?

AN inductor may store energy in: