Question 1: Palette 1/65

NEET 2026 MCQ

An ac circuit contains a resistance of $1 \mathrm{k} \Omega$, a capacitor of $0.1 \mu \mathrm{~F}$ and an inductor of 1 mH connected in series. The resonance frequency of the circuit is approximately:

A

13.5 kHz

B

10.1 kHz

C

20.7 kHz

D

15.9 kHz

Question 2: Palette 2/65

NEET 2026 MCQ

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?

A

$\frac{1}{120} \mathrm{~s}$

B

$\frac{1}{60} \mathrm{~s}$

C

$\frac{1}{30} \mathrm{~s}$

D

$\frac{1}{240} \mathrm{~s}$

Question 3: Palette 3/65

NEET 2026 MCQ

An ac voltage $V=220 \sin \left(2 \times 10^3 t\right)$ Volt is applied to a series LCR circuit. Then the current amplitude in this circuit is:

(Given : $L=10 \mathrm{mH}, C=25 \mu \mathrm{~F}, R=100 \Omega$ )

A

22.0 A

B

2.2 A

C

5.5 A

D

11.0 A

Question 4: Palette 4/65

NEET 2025 MCQ

To an ac power supply of 220 V at 50 Hz , a resistor of $20 \Omega$, a capacitor of reactance $25 \Omega$ and an inductor of reactance $45 \Omega$ are connected in series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively

A

15.6 A and $30^{\circ}$

B

15.6 A and $45^{\circ}$

C

7.8 A and $30^{\circ}$

D

7.8 A and $45^{\circ}$

Question 5: Palette 5/65

NEET 2024 MCQ

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

A

$\omega L I_0 \sin \omega t$

B

$\frac{I_0}{\omega L} \sin \omega t$

C

$\frac{I_0}{\omega L} \cos \omega t$

D

$\omega L I_0 \cos \omega t$

Question 6: Palette 6/65

NEET 2024 MCQ

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

A

8 mA

B

4 mA

C

0.4 A

D

4 A

Question 7: Palette 7/65

NEET 2024 MCQ

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 $t=0 \mathrm{~s}$. The time at which charge amplitude decreases to $0.50 Q_0$ is nearly:

[Given that $R=1.5 \Omega, L=12 \mathrm{~mH}, \ln (2)=0.693$]

A

19.01 ms

B

11.09 ms

C

19.01 s

D

11.09 s

Question 8: Palette 8/65

NEET 2024 MCQ

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

A

$1: 2$

B

$2: 1$

C

$1: 1$

D

$1: 4$

Question 9: Palette 9/65

NEET 2024 MCQ

A $10 \mu \mathrm{F}$ capacitor is connected to a $210 \mathrm{~V}, 50 \mathrm{~Hz}$ source as shown in figure. The peak current in the circuit is nearly $(\pi=3.14)$ :

A

0.58 A

B

0.93 A

C

1.20 A

D

0.35 A

Question 10: Palette 10/65

NEET 2023 MCQ

An ac source is connected in the given circuit. The value of $\phi$ will be :

A

$60^{\circ}$

B

$90^{\circ}$

C

$30^{\circ}$

D

$45^{\circ}$

Question 11: Palette 11/65

NEET 2023 MCQ

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

A

Z$_1$ < Z$_2$

B

Z$_1$ + Z$_2$ = 20 $\Omega$

C

Z$_1$ = Z$_2$

D

Z$_1$ > Z$_2$

Question 12: Palette 12/65

NEET 2023 MCQ

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

A

resistive circuit

B

LC circuit

C

inductive circuit

D

capacitive circuit

Question 13: Palette 13/65

NEET 2023 MCQ

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

A

4 $\Omega$

B

6 $\Omega$

C

1 $\Omega$

D

3 $\Omega$

Question 14: Palette 14/65

NEET 2023 MCQ

In a series LCR circuit, the inductance $L$ is $10 ~\mathrm{mH}$, capacitance $C$ is $1 ~\mu \mathrm{F}$ and resistance $R$ is $100 ~\Omega$. The frequency at which resonance occurs is :-

A

15.9 kHz

B

1.59 rad/s

C

1.59 kHz

D

15.9 rad/s

Question 15: Palette 15/65

NEET 2023 MCQ

A $12 \mathrm{~V}, 60 \mathrm{~W}$ lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of $220 \mathrm{~V}$. Assuming the transformer to be ideal, what is the current in the primary winding ?

A

2.7 A

B

3.7 A

C

0.37 A

D

0.27 A

Question 16: Palette 16/65

NEET 2023 MCQ

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

A

displacement current increases.

B

displacement current decreases.

C

capacitive reactance remains constant.

D

capacitive reactance decreases.

Question 17: Palette 17/65

NEET 2023 MCQ

The magnetic energy stored in an inductor of inductance $4 ~\mu \mathrm{H}$ carrying a current of $2 \mathrm{~A}$ is :

A

$4 \mathrm{~mJ}$

B

$8 \mathrm{~mJ}$

C

$8 ~\mu \mathrm{J}$

D

$4 ~\mu \mathrm{J}$

Question 18: Palette 18/65

NEET 2023 MCQ

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

A

$15 \Omega$

B

$5 \sqrt{5} \Omega$

C

$25 \Omega$

D

$10 \sqrt{2} \Omega$

Question 19: Palette 19/65

NEET 2022 MCQ

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 circuit containing pure capacitance only, the phase difference between the current and voltage is $\pi$.

In the light of the above statements, choose the most appropriate answer from the options given below

A

Statement I is incorrect but Statement II is correct

B

Both Statement I and Statement II are correct

C

Both Statement I and Statement II are incorrect

D

Statement I is correct but Statement II is incorrect

Question 20: Palette 20/65

NEET 2022 MCQ

An inductor of inductance 2 mH is connected to a 220 V, 50 Hz ac source. Let the inductive reactance in the circuit is X₁. If a 220 V dc source replace the ac source in the circuit, then the inductive reactance in the circuit is X₂. X₁ and X₂ respectively are :

A

0.628 $\Omega$, infinity

B

6.28 $\Omega$, zero

C

6.28 $\Omega$, infinity

D

0.628 $\Omega$, zero

Question 21: Palette 21/65

NEET 2022 MCQ

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

A

2 A

B

0.707 A

C

1 A

D

1.414 A

Question 22: Palette 22/65

NEET 2022 MCQ

The peak voltage of the ac source is equal to

A

The value of voltage supplied to the circuit

B

The rms value of the ac source

C

$\sqrt2$ times the rms value of the ac source

D

1/$\sqrt2$ times the rms value of the ac source

Question 23: Palette 23/65

NEET 2022 MCQ

A series LCR circuit with inductance 10 H, capacitance 10 $\mu$F, resistance 50 $\Omega$ is connected to an ac source of voltage, V = 200sin(100t) volt. If the resonant frequency of the LCR circuit is v₀ and the frequency of the ac source is v, then

A

${v_0} = v = 50$ Hz

B

${v_0} = v = {{50} \over \pi }$ Hz

C

${v_0} = {{50} \over \pi }$ Hz, $v = 50$ Hz

D

$v = 100$ Hz, ${v_0} = {{100} \over \pi }$ Hz

Question 24: Palette 24/65

NEET 2021 MCQ

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' volts as shown in figure. Potential difference across L, C and R is 40V, 10V and 40V, respectively. The amplitude of current flowing through LCR series circuit is 10$\sqrt 2 $ A. The impedance of the circuit is :

A

5$\Omega$

B

4$\sqrt 2 $ $\Omega$

C

5/$\sqrt 2 $ $\Omega$

D

4$\Omega$

Question 25: Palette 25/65

NEET 2021 MCQ

A capacitor of capacitance 'C', is connected across an ac source of voltage V, given by

V = V₀sin$\omega$t

The displacement current between the plates of the capacitor, would then be given by :

A

${I_d} = {V_0}\omega C\sin \omega t$

B

${I_d} = {V_0}\omega C\cos \omega t$

C

${I_d} = {{{V_0}} \over {\omega C}}\cos \omega t$

D

${I_d} = {{{V_0}} \over {\omega C}}\sin \omega t$

Question 26: Palette 26/65

NEET 2021 MCQ

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

A

4A

B

0.2A

C

0.4A

D

2A

Question 27: Palette 27/65

NEET 2021 MCQ

A series LCR circuit containing 5.0 H inductor, 80$\mu$F capacitor and 40$\Omega$ resistor is connected to 230V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be :

A

42 rad/s and 58 rad/s

B

25 rad/s and 75 rad/s

C

50 rad/s and 25 rad/s

D

46 rad/s and 54 rad/s

Question 28: Palette 28/65

NEET 2020 MCQ

A 40 $\mu $F capacitor is connected to a 200 V. 50 Hz ac supply. The rms value of the current on the circuit is, nearly :

A

2.05 A

B

2.5 A

C

25.1 A

D

1.7 A

Question 29: Palette 29/65

NEET 2020 MCQ

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 ${\pi \over 3}$. If instead C is removed from the circuit, the phase difference is again ${\pi \over 3}$ between current and voltage. The power factor of the circuit is :

A

0.5

B

1.0

C

$ - $ 1.0

D

zero

Question 30: Palette 30/65

NEET 2018 MCQ

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

A

0.138 H

B

138.88 H

C

1.389 H

D

13.89 H

Question 31: Palette 31/65

NEET 2018 MCQ

An inductor 20 mH, a capacitor 100 $\mu $F and a resistor 50 $\Omega $ are connected in series across a source of emf, V = 10 sin 314 t. The power loss in the circuit is

A

0.79 W

B

0.43 W

C

2.74 W

D

1.13 W

Question 32: Palette 32/65

NEET 2017 MCQ

Figure shows a circuit that contains three identical resistors with resistance R = 9.0 $\Omega $ each, two identical inductors with inductance $L$ = 2.0 mH each, and an ideal battery with emf $\varepsilon = 18V$. The current $i$ through the battery just after the switch closed is

A

0.2 A

B

4 A

C

0 ampere

D

2 mA

Question 33: Palette 33/65

NEET 2016 MCQ

Which of the following combinations should be selected for better tuning of an L-C-R circuit used for combination ?

A

R = 20 $\Omega $, L = 1.5 H, C = 35 $\mu $F

B

R = 25 $\Omega $, L = 2.5 H, C = 45 $\mu $F

C

R = 15 $\Omega $, L = 3.5 H, C = 30 $\mu $F

D

R = 25 $\Omega $, L = 1.5 H, C = 45 $\mu $F

Question 34: Palette 34/65

NEET 2016 MCQ

The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is

A

0.4

B

0.5

C

0.8

D

1.0

Question 35: Palette 35/65

NEET 2016 MCQ

A 100 $\Omega $ resistance and a capacitor of 100 $\Omega $ reactance are connected in series across a 220 V source. When the capacitor is 50% charged, the peak value of the displacement current is

A

2.2 A

B

11 A

C

4.4 A

D

11$\sqrt 2 A$

Question 36: Palette 36/65

NEET 2016 MCQ

A small signal voltage V(t) = V₀ sin$\omega $t is applied across an ideal capacitor C

A

Current $I(t)$ is in phase with voltage $V(t)$.

B

Current $I(t)$ leads voltage V(t) by 180^o

C

Current $I(t)$, legs voltage $V(t)$ by 90^o.

D

Over a full cycle the capacitor C foes not consume any energy from the voltage source.

Question 37: Palette 37/65

NEET 2016 MCQ

An inductor 20 mH, a capacitor 50 $\mu F$ and a resistor 40 $\Omega $ are connected in series across a source of emf V = 10 sin 340t. The power loss in A.C. circuit is

A

0.76 W

B

0.89 W

C

0.51 W

D

0.67 W

Question 38: Palette 38/65

NEET 2015 MCQ

A series R-C circuit is connected to an alternating voltage source. Consider two situations :
(a)  When capacitor is air filled.
(b)  When capacitor is mica filled.
Current through resistor is $I$ and voltage across capacitor is $V$ then

A

${i_a} > {i_b}$

B

${V_a} = {V_b}$

C

${V_a} < {V_b}$

D

${V_a} > {V_b}$

Question 39: Palette 39/65

NEET 2015 MCQ

A resistance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes 'Z'. the power drawn will be

A

$P\left( {{R \over Z}} \right)$

B

P

C

$P{\left( {{R \over Z}} \right)^2}$

D

$P\sqrt {{R \over Z}} $

Question 40: Palette 40/65

NEET 2014 MCQ

A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are

A

300 V, 15 A

B

450 V, 15 A

C

450 V, 13.5 A

D

600 V, 15 A

Question 41: Palette 41/65

NEET 2013 MCQ

The primary of a transformer when connected to a dc battery of 10 Volt draws a current of 1 mA. The number of turns of the primary and secondary windings are 50 and 100 respectively. The voltage in the secondary and the current drawn by the circuit in the secondary are respectively

A

20 V and 2.0 mA

B

10 V and 0.5 mA

C

Zero volt and therefore no current

D

20 V and 0.5 mA

Question 42: Palette 42/65

NEET 2013 MCQ

A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when

A

a capacitance of reactance X_C = X_L is included in the same citcuit.

B

an iron rod is inserted in the coil.

C

frequency of the AC source is decreased.

D

number of turns in the coil is reduced.

Question 43: Palette 43/65

NEET 2012 MCQ

The instantaneous values of alternating current and voltage in a circuit are given as

$i = {1 \over {\sqrt 2 }}$ sin (100 $\pi $t) ampere

$e = {1 \over {\sqrt 2 }}\sin \left( {100\pi t + {\pi \over 3}} \right)$ Volt

The average power in watts consumed in the circuit is

A

${1 \over 4}$

B

${{\sqrt 3 } \over 4}$

C

${1 \over 2}$

D

${1 \over 8}$

Question 44: Palette 44/65

NEET 2012 MCQ

The current $(I)$ in the inductance is varying with time according to the plot shown in figure.


Which one of the following is the correct variation of voltage with time in the coil ?

A

B

C

D

Question 45: Palette 45/65

NEET 2012 MCQ

In an electrical circuit R, L, C and a.c. voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is If instead, C is removed from the circuit, the phase difference is again. The power factor of the circuit is

A

${1 \over 2}$

B

${1 \over {\sqrt 2 }}$

C

1

D

${{\sqrt 3 } \over 2}$

Question 46: Palette 46/65

NEET 2011 MCQ

A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be

A

2.0 A

B

4.0 A

C

8.0 A

D

${{20} \over {\sqrt {13} }}A$

Question 47: Palette 47/65

NEET 2011 MCQ

The r.m.s. value of potential difference V shown in the figure is

A

${{{V_0}} \over {\sqrt 3 }}$

B

V₀

C

${{{V_0}} \over {\sqrt 2 }}$

D

${{{V_0}} \over 2}$

Question 48: Palette 48/65

NEET 2011 MCQ

An ac voltage is applied to a resistance R and an inductor L in series. If R and the inductive reactance are both equal to 3 $\Omega $, the phase difference between the applied voltage and the current in the circuit is

A

$\pi /6$

B

$\pi /4$

C

$\pi /2$

D

zero

Question 49: Palette 49/65

NEET 2011 MCQ

In the ac circuit an alternating voltage e = $200\sqrt 2 $sin100t volts is connected to a capacitor of capacity 1 $\mu $F. The r.m.s. value of the current in the circuit is

A

10 mA

B

100 mA

C

200 mA

D

20 mA

Question 50: Palette 50/65

NEET 2010 MCQ

A condenser of capacity C is charged to a potential difference of V₁. The plates of th condenser are then connected to an ideal inductor of inductance L. The current through the inductor when the potential difference across the condenser reduces to V₂ is

A

${\left( {{{C{{\left( {{V_1} - {V_2}} \right)}^2}} \over L}} \right)^{{1 \over 2}}}$

B

${{C\left( {V_1^2 - V_2^2} \right)} \over L}$

C

${{C\left( {V_1^2 + V_2^2} \right)} \over L}$

D

${\left( {{{C\left( {V_1^2 - V_2^2} \right)} \over L}} \right)^{{1 \over 2}}}$

Question 51: Palette 51/65

NEET 2010 MCQ

A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drwn by the primary windings of the transformer is

A

3.6 ampere

B

2.8 ampere

C

2.5 ampere

D

5.0 ampere

Question 52: Palette 52/65

NEET 2010 MCQ

In the given circuit the reading of voltmeter V₁ and V₂ are 300 volts each. The reading of the voltmeter V₃ and ammeter A are respectively

A

150V, 2.2A

B

220V, 2.2A

C

220V, 2.0A

D

100V, 2.0A

Question 53: Palette 53/65

NEET 2009 MCQ

Power dissipated in an LCR series circuit connected to an A.C. source of emf $\varepsilon $ is

A

${{{\varepsilon ^2}\sqrt {{R^2} + {{\left( {L\omega - {1 \over {\omega }}} \right)}^2}} } \over R}$

B

${{{\varepsilon ^2}\sqrt {{R^2} + {{\left( {L\omega - {1 \over {C\omega }}} \right)}^2}} } \over R}$

C

${{{\varepsilon ^2}R} \over {\sqrt {{R^2} + {{\left( {L - {1 \over {C\omega }}} \right)}^2}} }}$

D

${{{\varepsilon ^2}R} \over {\left[ {{R^2} + {{\left( {L\omega - {1 \over {C\omega }}} \right)}^2}} \right]}}$

Question 54: Palette 54/65

NEET 2008 MCQ

In an a.c. circuit the e.m.f. ($\varepsilon $) and the current

(i)  at any instant are given respectively by
$\varepsilon $ = E₀sin$\omega $t,   $i$ = $I$₀sin($\omega $t $-$ $\phi $)

The average power in the circuit over one cycle of a.c. is

A

${{{E_0}{I_0}} \over 2}\cos \phi $

B

${{E_0}{I_0}}$

C

${{{E_0}{I_0}} \over 2}$

D

${{{E_0}{I_0}} \over 2}\sin \phi $

Question 55: Palette 55/65

NEET 2007 MCQ

A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately

A

50%

B

90%

C

10%

D

30%

Question 56: Palette 56/65

NEET 2007 MCQ

The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux $\phi $ linked with the primary coil is given by $\phi $ = $\phi $₀ + 4t, where $\phi $ is webers, t is time in seconds and $\phi $₀ is a constant, the output voltage across the secondary coil is

A

120 volt

B

220 volts

C

30 volts

D

90 volts.

Question 57: Palette 57/65

NEET 2007 MCQ

What is the value of inductance L for which the current is maximum in a series LCR circuit with C = 10 $\mu $F and $\omega $ = 1000 s^$-$1 ?

A

1 mH

B

cannot be calculated unless R is known

C

10 mH

D

100 mH

Question 58: Palette 58/65

NEET 2006 MCQ

A coil of inductive reactance 31 $\Omega $ has a resistance of 8 $\Omega $. It is placed in series with a condenser of capacitative reactance 25 $\Omega $. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is

A

0.33

B

0.56

C

0.64

D

0.80

Question 59: Palette 59/65

NEET 2006 MCQ

A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency $f$. If L is doubled and C is changed to 4C, the frequency will be

A

$f/2$

B

$f/4$

C

$8f$

D

$f/2$$\sqrt 2 $

Question 60: Palette 60/65

NEET 2006 MCQ

The core of a transformer is laminated because

A

ratio of voltage in primary and secondary may be increased

B

energy losses due to eddy currents may be minimised

C

the weight of the transformer may be reduced

D

rusting of the core may be prevented.

Question 61: Palette 61/65

NEET 2005 MCQ

In a circuit L, C and R are connected in series with an alternating voltage source of frquency $f.$ The current leads the voltage by 45^o. The value of C is

A

${1 \over {\pi f\left( {2\pi f\,L - R} \right)}}$

B

${1 \over {2\pi f\left( {2\pi f\,L - R} \right)}}$

C

${1 \over {\pi f\left( {2\pi f\,L + R} \right)}}$

D

${1 \over {2\pi f\left( {2\pi f\,L + R} \right)}}$

Question 62: Palette 62/65

NEET 2004 MCQ

A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is

A

5 seconds

B

1/5 seconds

C

40 seconds

D

20 seconds

Question 63: Palette 63/65

NEET 2002 MCQ

For a series LCR circuit the power loss at resonance is

A

${{{V^2}} \over {\left[ {\omega L - {1 \over {\omega C}}} \right]}}$

B

${I^2}L\omega $

C

${I^2}R$

D

${{{V^2}} \over {C\omega }}$

Question 64: Palette 64/65

NEET 2001 MCQ

A capacitor of capacity C has reactance X. If capacitance and frequency become double then reactance will be

A

4X

B

X/2

C

X/4

D

2X

Question 65: Palette 65/65

NEET 2001 MCQ

The value of quality factor is

A

${{\omega R} \over L}$

B

${1 \over {\omega RC}}$

C

$\sqrt {LC} $

D

$L/R$