A small-signal voltage V(t)=Vo sinωt is applied across an ideal capacitor C 
(1) over a full cycle, the capacitor C does not consume any energy from the voltage source

(2) current I(t) is in phase with voltage V(t)

(3) current I(t) leads voltage V(t) by 180°

(4) current I(t) lags voltage V(t) by 90°

Subtopic:  Different Types of AC Circuits |
 70%
From NCERT
NEET - 2016
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An inductor 20 mH, a capacitor 50μF, and a resistor 40Ω are connected in series across a source of emf V=10sin340t. The power loss in the AC circuit is:

1. 0.67 W

2. 0.78W

3. 0.89 W

4. 0.46 W

Subtopic:  Different Types of AC Circuits |
From NCERT
NEET - 2016
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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:

1. PRZ2
2. PRZ
3. PRZ
4. P 



Subtopic:  Different Types of AC Circuits |
 56%
From NCERT
NEET - 2015
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A series R-C circuit is connected to an alternating voltage source. Consider two situations:

1. When the capacitor is air-filled.

2. When the capacitor is mica filled.

Current through the resistor is I and voltage across the capacitor is V then

(1)Va<Vb

(2)Va>Vb

(3)ia>ib

(4)Va=Vb

Subtopic:  Different Types of AC Circuits |
 64%
From NCERT
NEET - 2015
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A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6A, the voltage across the secondary coil and the current in the primary coil respectively are
1. 300V,15A
2. 450V,15A

3. 450V,13.5A

4. 600V,15A

Subtopic:  Transformer |
 75%
From NCERT
NEET - 2014
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A coil of self-inductance \(L\) is connected in series with a bulb \(B\) and an AC source. The brightness of the bulb decreases when:
1. Frequency of the AC source is decreased
2. The number of turns in the coil is reduced
3. A capacitance of reactance \(X_C = X_L\) is included in the same circuit
4. An iron rod is inserted in the coil
Subtopic:  Different Types of AC Circuits |
 69%
From NCERT
NEET - 2013
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In an electrical circuit R, L, C, and an AC 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 π/3. If instead, C is removed from the circuit, the phase difference is again π/3. The power factor of the circuit is

(1) 1/2                                           

(2) 1/2

(3) 1                                             

(4) 3/2

Subtopic:  Different Types of AC Circuits |
 70%
From NCERT
NEET - 2020
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The instantaneous values of alternating

current and voltages in a circuit are given

as 

i=12sin(100πt) ampere
e=12sin(100πt+π/3) volt

The average power in Watts consumed in the

circuit is

(a) 14

(b) 34

(c) 12 

(d) 18

Subtopic:  Different Types of AC Circuits |
 70%
From NCERT
NEET - 2012
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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 \(3~ \Omega, \) then the phase difference between the applied voltage and the current in the circuit will be:

1. \( \pi / 4\) 2. \( \pi / 2\)
3. zero 4. \( \pi / 6\)
Subtopic:  Different Types of AC Circuits |
 74%
From NCERT
NEET - 2011
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The rms value of potential difference V shown in the figure is

                        

(1) Vo                                                     

(2) Vo2

(3)Vo2                                                     

(4) Vo3   

Subtopic:  RMS & Average Values |
 77%
From NCERT
NEET - 2011
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