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

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

Choke coil in A.C circuit is used for

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

The amplitude modulated transmission waves have frequencies range:

The phase angle at +vc (positive) peak is

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

Power factor is equal to:

The sum of positive and negative peak value is called

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

In R-L series circuit phase angle is given by

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

The reactance Of capacitor is equal to

A.C. through inductor, the applied voltage:

The most common source of A.C is:

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

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

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

The range or F.M transmission frequencies is from

Choke used to limit high frequency A.C has

Electromagnetic waves are, generated when

High frequency radio wave is called as:-.

In a pure inductive A.C. circuit the current

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

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

The speed of electromagnetic wave in vacuum is given by

In the modulation process, low, frequency signal is called

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

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

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

Electromagnetic waves emitted from radio antenna are:

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

The range of values of power factor is

In the modulation process, high frequency signal is called

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

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

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

The frequency of AC in Pakistan is;

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

The power factor in wattles current is

Dimensions of RC matches with

Waves we prefer for transmission of radio signals have

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

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

Which one is not present in AC generator?

The wire receiving the waves is known as

The sum of positive and negative peak values is called:

AN inductor may store energy in:

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

The combined effect of resistance and reactance is known as:

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

The waveform of alternating voltage is a:

The power factor of RL-series circuit is :

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

Capacitive reactance Xc =

In case of capacitor, the unit of reactance is:

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

Electromagnetic waves transport

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

Main reasons for worldwide use of A. C is

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

Power dissipated in pure inductor 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

Direct current cannot flow through

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

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

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

The reactance of an inductor is

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

In alternating current, Inductors behave like

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

AC can be converted into DC by:

Impedance Z can he expressed as;

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

Average value of current and voltage over a complete cycle is

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

The flow of D.C. current is opposed by

Modulation can be achieved by

Electromagnetic waves do not transport any:

Which of the following electromagnetic waves have shortest wavelength?

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

At high frequency the value of reactance of capacitor will he

Choke consumes extremely small:

During each cycle AC voltage reaches a peak value

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

In pure RLC circuit, the energy is dissipated in:

The frequency range. for F.M is given by

As a result of modulation, the resulting wave is called

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

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

Direct current cannot flow through:

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

The power factor of an A.C circuit has.

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

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 at its normal value when the signal amplitude is at its

In RLC parallel circuit the resonance frequency is

AC voltmeter measure

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