PHYSICS 2nd Year MCQs Chapter No.5 ALTERNATING CURRENT Online MDCAT Exams Preparation Test No.2

The behavior of resistance is independent of

A changing magnetic field creates a

In the RLC parallel circuit, the resonance frequency is

Metals detectors arc made by the combination of

Choke consumes extremely small

In a three phase A.C, generator, the phase difference between each pair of coil is equal to

The opposition offered by the inductor to the flow of A.C. is called

At resonance frequency, the impedance of RLC series circuit is

The average of square value of alternating current or voltage over a complete cycle is:

Which of the following waves are more energetic

As frequency of AC increases

For a practical L-C parallel circuit at the resonance frequency the circuit impedance is

The output voltage of an A.C. generator at time t = T/4 is given by

A device that allows only the continuous flow of an A.C. through a circuit is

Maxwell's equation were discovered by .James Clark Maxwell in.

Current in a dry-cell is an example of

The A.C. circuit in which current and voltage are in phase, the power factor is

The capacitance required to construct a resonance circuit of frequency 1000 KHz with an inductor of 5mH is

In free space, the speed of electromagnetic waves is

The flow of D.C. is blocked by

The current which keeps on reversing its direction (or polarity) with lime is called

In capacitor circuit, at low frequency, the current will be

At low frequency of the alternating current, the current will be

A radio transmitting antenna provides a good example of generating

If we connect an ordinary D.C. ammeter to measure alternating current, it Would measure its

The graph between alternating voltage and time is a

SI unit of impedance is

In a pure inductor coil the power dissipated is

In pure resistive A.C. circuit the instantaneous values of voltage and current are

Electromagnetic waves consists of

The inductance and capacitance behave as a function of

The SI unit of inductance is

As A.C. continuously flows through the plates of a capacitor because of

The electric field and magnetic field and the direction of propagation of electromagnetic waves are mutually

The capacitance required to construct a resonance circuit of frequency 1000 KHz with an inductor of 5mH is

The examples of electromagnetic waves are

In a pure capacitor A.C. circuit, the current and the applied voltage are

The averagelueiof alternating current or voltage over a complete cycle is

In an A.C. circuit with pure capacitor only, the current

In L-C parallel circuit at resonance condition the power factor is

In the equation P = IV cos 0, cos 0 is called

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

The frequency for 2 henry inductor having reactance of 1000? is

If I_o is the peak value of A.C. current, itsaverage value over the complete cycle is:

Which of the following has smallest wavelength?

In a R-L series circuit, the current

In a L-C parallel circuit at the resonance condition the current and applied voltage are

The waves which do not require any material medium for their propagation are called

In capacitive circuit, at high frequency, the current will he

At low frequency of the alternating current, the inductive reactance XL

In three phase A.C. generator, the voltage between any line and the neutral line is

In a capacitive A.C. circuit the charge q and applied voltage V are

The unit of reactance is X_c of a a capacitor joined across alternating source can be found by the relation

Which of the following EMW has the longest wavelength?

The main reason far the world-wide use of A.C. is that it can be transmitted to

A device that allows only the continuous flow of A.C. through a circuit is

The highest value reached, by A.C. voltage or current in one cycle is called

An A.C. varies as a function of

A three phase A.C. generator, if the first coil has phase 0, then the other two coils will have phases

In a pure capacitor A.C. circuit, the current I anti charge q are

A choke is a coil having

The basic circuit element in a D.C. circuit which controls the current or voltage is a

In a three phase A.C. generator, there are three coils inclined at

Voltage across any two lines of a three phase A.C. supply is about

The phase at the negative peak of A.0 is

Electromagnetic waves emitted from an antenna arc

In L-C parallel circuit the capacitor draws a

In RLC series circuit, the current at resonance frequency is

The inductive reactance of the coil is given by the expression

The frequency at which an inductor of 1.0 H have a reactance of 500 ?
is

If V_o is thee value of A.C. voltage its rms value is

Electromagnetic waves were discovered by

The value of resonance frequency f1 in case of series resonance circuit is given by

The output voltage of n A.C. generator at time t = T/2 is given by

Which one Of the following waves are not electromagnetic waves?

In free space, the radio waves travel with a speed

The expression P = VI is true in case of A.C. circuit when

The power dissipated in a pure inductive or capacitance, circuit is

In the resonance condition of RLC series circuit the power factor is

Alternating current is that which is produced by a voltage source whose polarity

The most common source of an A.C. voltage is

An incandescent lamp will reach its maximum brilliance ________time per second when connected to a 220V,50Hz source

In RLC series circuit, at high frequency

In RLC series circuit, at resonance condition the voltage and current are

A sinusoidal current has rms (effective) value of 10A. Its maximum value is

In a R-C series circuit, the current

A resonance curve for RLC circuit is a plot of frequency versus

The P-P value of AC voltage wave form is

In capacitive circuit, at high frequency, the reactance will be

A choke coil is used to limit current in

The inductive reactance is directly proportional to

In RLC series circuit, the impedance of the circuit at resonance is

The expression P = VI holds only when current and voltage are

Ohm is the unit of

The combined effect of resistance and reactance in an AC circuit is called

The ratio of the rms value Of the applied voltage to the rms value of A.C. is called

The power dissipated in resistive circuit is

For practice L-C parallel circuit the current at resonance frequency is

The phase angle between the voltage and current in resistive A.C. circuit is

Capacitor of 2000 μF is connected across alternating source of 20 volts. If frequency of the source is 50/? 117 Hz then reactance of the capacitor is: