NEET PYQ Alternating Current - Chapter-wise Questions with Solutions

About Alternating Current PYQs

Alternating Current has 366 previous year questions in the Quantrex Academy NEET UG Physics bank. The 220 questions in this list come from NEET (128), AIIMS (35), MHT CET Medical (34) and 1 other source, spanning 2001 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

NEET Alternating Current PYQs with Solutions

About Alternating Current PYQs

Questions by year (this list)

Alternating Current questions with solutions

A step down transformer connected to an a.c. mains of 220 V is made to operate at 5.5 V, 44 W lamp. The current in the primary circuit is (Ignore power losses)

Which phasor diagram represents LCR circuit at resonance?

For an R-L series circuit, the power factor is 3 2 , for R-L frequency f Hz. If the frequency doubles, the new power factor will be

In an AC circuit, the current is I = 100 (5t) A. The value of I_ rms is

The ratio of power factor of purely resistive circuit to purely reactive circuit is ( 0^ ^ ∘ = 1 and 90^ ^ ∘ = 0 )

In an LCR series circuit, at resonance,

In an AC circuit, E and I are given by E = 150 (150t) V and I = 150 (150t + (π)/(3)) A. The power dissipated in the circuit is \ (60)^ ^ ∘ = 1/2\

A series LCR circuit is connected across a source E of e.m.f. E=15 ( 50 π t- (π)/(3)). The current from the supply is I=5 (50π t+(π)/(6)) . The impedance of the circuit and the

The alternating voltage is given by V=V_0 (ω t+ (π)/(6)). When will the voltage be maximum for the first time? \ (90)^ ^ ∘ =1\

An alternating voltage is given as, E=100 2 100t This voltage E is applied to a capacitor of 1\ . The current reading in an a.c. ammeter in mA is

In an L-C-R series, AC circuit at resonance,

If a coil of inductance L and resistance R is connected to AC source with voltage V and angular frequency ω and current I, then the inductance L is

The potential differences across the resistor, capacitor and inductor are 80 V, 40 and 100 V respectively in series LCR circuit. The power factor of this circuit is

In a series LCR circuit, the resistance (R), inductive reactance X_L = 2R and capacitive reactance X_C = R . The impedance of the circuit is

If the r.m.s. current in an a.c. circuit is 5 A, having frequency 50 Hz. The value of current (1)/(300) s after its value becomes zero (in A) is \ (π/3) = (3)^ 0.5 /2\

In the LCR series circuit, an alternating e.m.f. e and current i are given by the equation e = 100 (100t)\,V and i = 100 (100t + (π)/(3))mA . The average power dissipated in the

In a series LCR circuit R = X_L = 2X_C . The impedance of the circuit and phase difference between 'V' and 'I' respectively will be

An alternating current is given by i = i_1 ω t - i_2 ω t . The rms current is given by

A series LCR circuit is connected to a source of alternating e.m.f. of 50 V. The potential difference across inductor and capacitor is 80 V and 50 V respectively. The potential

Consider the statements on capacitive reactance. Statement I: As capacitance increases, the capacitive reactance also increases. Statement II: The capacitive reactance is

In a step-up transformer, if the voltage in the secondary is increased, then the current in the primary:

At resonance, the LC parallel resonant circuit

A series LCR circuit is connected to an AC source of 220 V, 50 Hz. The circuit contains resistance of 100\ Ω , capacitor of capacitive reactance X_C\ Ω and inductor of inductive

An a.c. source is connected to a capacitor 'C'. Due to increase in its operating frequency

In series LCR circuit, R = 10\ Ω and impedance is 30\ Ω . An rms voltage 210\ V is applied across the circuit. The true power consumed in A.C. circuit in watt is

A series L-C-R circuit is connected to a source of alternating emf of 50\ V . The potential difference across inductor and capacitor is 80\ V and 50\ V respectively. The potential

When a 60 mH inductor and resistor are connected in series with an AC source, the voltage leads the current by 60^ ^ ∘ . If the inductor is replaced by a 0.5\ μ F capacitor, the

When a.c. source is connected across a resistance, the correct phasor relation between the current ( i_R ) and emf ( e_R ) is shown in figure

The output of a step-down transformer is measured to be 56 V when connected to 14 W light bulb. The value of peak current is (in A)

An alternating voltage given as, E = 100 2 (100t) volt is applied to a capacitor of 1\ . The current reading of the ammeter will be equal to

The r.m.s value of current in a 50 Hz A.C. circuit is 10 A. The average value of A.C. current over a cycle is

In a series LCR circuit, the inductance L is 10 mH, capacitance C is 100 μ F and resistance R is 20 Ω . The frequency at which impedance is 20 Ω , is

A resistance 'R' draws a power 'P' when connected to A.C. source. If an inductor is now placed in series with the resistance, such that the impedance of the circuit becomes 'Z'

In series LCR circuit the alternating emf 'e' and the current 'i' are given by the equations e = e_0 ω t , i = i_0 (ω t + (π)/(6)) . The average power dissipated in the circuit

An ac circuit contains a resistance of 1 k Ω , a capacitor of 0.1\ μ F and an inductor of 1 mH connected in series. The resonance frequency of the circuit is approximately :

The peak value of an alternating current is 5 A and frequency is 60 Hz. How long will the current, starting from zero, take to reach the peak value ?

An ac voltage V=220 (2×10^3 t) Volt is applied to a series LCR circuit. Then the current amplitude in this circuit is : (Given : L=10 mH, C=25\,μ F, R=100\,Ω )

To an ac power supply of 220 V at 50 Hz , a resistor of 20 Ω , a capacitor of reactance 25 Ω and an inductor of reactance 45 Ω are connected is series. The corresponding current

A step up transformer is connected to an ac mains supply of 220 V to operate at 11000 ~V, 88 watt. The current in the secondary circuit, ignoring the power loss in the

The amplitude of the charge oscillating in a circuit decreases exponentially as Q=Q_0 e^ -R t 2 L , where Q_0 is the charge at t=0 ~s . The time at which charge amplitude

In the circuit shown below, the inductance L is connected to an ac source. The current flowing in the circuit is I=I_0 ω t . The voltage drop (V_L) across L is

A 10 μ F capacitor is connected to a 210 ~V, 50 ~Hz source as shown in figure. The peak current in the circuit is nearly (π=3.14) :

In an ideal transformer, the turns ratio is (N_P)/(N_S)=(1)/(2) . The ratio V_S: V_P is equal to (the symbols carry their usual meaning) :

An ac source is connected in the given circuit. The value of φ will be

The maximum power is dissipated for an ac in a/an

For very high frequencies, the effective impedance of the circuit (shown in the figure) will be

A 12V, 60W lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of 220V . Assuming the transformer to be ideal, what is the

In a series LCR circuit, the inductance L is 10mH , capacitance C is 1μ F and resistance R is 100Ω . The frequency at which resonance occurs is:

An ac source is connected to a capacitor C . Due to decrease in its operating frequency:

The net impedance of circuit (as shown in figure) will be:

If Z_1 and Z_2 are the impedances of the given circuits (a) and (b) as shown in figures, then choose the correct option.

An inductor of inductance 2 mH is connected to a 220 ~V, 50 ~Hz a.c. source. Let inductive reactance in the circuit is X_1 . If a 220 ~V d.c. source replaces the a.c. source in

Given below are two statements: Statement-I: In an a.c. circuit, the current through a capacitor leads the voltage across it. Statement-II: In a.c. circuits containing pure

The peak voltage of the ac source is equal to

A series LCR circuit with inductance 10H , capacitance 10 , resistance 50Ω is connected to an AC source of voltage, V = 200sin(100t) volt. If the resonant frequency of the LCR

A standard filament lamp consumes 100 ~W when connected to 200 ~V a.c. mains supply. The peak current through the bulb will be :

An inductor of inductance L , a capacitor of capacitance C and a resistor of resistance R ~are connected in series to an ac source of potential difference V ~volt& as shown in

A step down transformer connected to an ac mains supply of 220V is made to operate at 11V, 44W lamp. Ignoring power losses in the transformer, what is the current in the primary

A series L - C - R circuit containing 5 . 0H inductor, 80 capacitor and 40Ω resistor is connected to 230V variable frequency ac source. The angular frequencies of the source at

A light bulb and an inductor coil are connected to an ac source through a key as shown in the figure below. The key is closed and after sometime an iron rod is inserted into the

A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is (π)/(3) . If instead C is

A 40μ F capacitor is connected to a 200V , 50Hz AC supply. The rms value of the current in the circuit is, nearly:

In a transformer number of turns in primary circuit is 500 and in secondary circuit number of turns is 10 . The load resistance is 10 Ω and voltage of secondary coil is 50 ~V .

In a L C R oscillatory circuit, find the energy stored in inductor at resonance if voltage of source is 10 ~V , resistance is 10 Ω and inductance =1 H .

In LCR series circuit, source voltage is 120 ~V and voltage across inductor 50 ~V . If voltage drop across resistance is 40 ~V , then determine voltage in capacitor.

Assertion : A capacitor of suitable capacitance can be used in an AC circuit in place of the choke coil. Reason : A capacitor blocks DC and allows AC only.

Find resonance frequency in the given circuit

Find the current drawn from the battery just after the switch is closed.

A circuit when connected to an AC source of 12 ~V gives a current of 0.2 ~A . The same circuit when connected to a DC source of 12 ~V , gives a current of 0.4 ~A . The circuit is

Which of the following acts as a circuit protective device?

The voltage across a pure inductor is represented in figure. Which one of the following curves in the figure will represent the current?

An electric bulb has a rated power of 50 ~W at 100 ~V . If it is used on an AC source of 200 ~V , 50 ~Hz , a choke has to be used in series with it. This choke should have an

A series combination of resistor (R) and capacitor (C) is connected to an AC source of angular frequency ω . Keeping the voltage same, if the frequency is changed to (ω)/(3) , the

In a L-C circuit, angular frequency at resonance is ω . What will be the new angular frequency when inductor's inductance is made two times and capacitor's capacitance is made

The magnetic potential energy stored in a certain inductor is 25mJ , when the current in the inductor is 60mA . This inductor is of inductance

An inductor 20 mH, capacitor 100μ F and a resistor 50Ω are connected in series across a source of emf, V = 10sin ⁡( 314t ⁡) . The power loss in the circuit is