An AC voltage source is connected to a series \(LCR\) circuit. When \(L\) is removed from the circuit, the phase difference between current and voltage is \(\frac{\pi}{3}\). If \(C\) is instead removed from the circuit, the phase difference is again \(\frac{\pi}{3}\) between current and voltage. The power factor of the circuit is:
1. \(0.5\)
2. \(1.0\)
3. \(-1.0\)
4. zero

Subtopic:  Power factor |
 65%
From NCERT
NEET - 2020
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A \(40\) μF capacitor is connected to a \(200\) V, \(50\) Hz AC supply. The rms value of the current in the circuit is, nearly:
1. \(2.05\) A
2. \(2.5\) A
3. \(25.1\) A
4. \(1.7\) A

Subtopic:  RMS & Average Values |
 69%
From NCERT
NEET - 2020
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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 some time an iron rod is inserted into the interior of the inductor. The glow of the light bulb:

     

1. decreases 
2. remains unchanged 
3. will fluctuate 
4. increases 
Subtopic:  Different Types of AC Circuits |
 61%
From NCERT
NEET - 2020
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A circuit when connected to an AC source of \(12~\text{V}\) gives a current of \(0.2~\text{A}\). The same circuit when connected to a DC source of \(12~\text{V}\), gives a current of \(0.4~\text{A}\). The circuit is:
1. series \({LR}\)
2. series \({RC}\)
3. series \({LC}\)
4. series \({LCR}\)

Subtopic:  Different Types of AC Circuits |
 56%
From NCERT
NEET - 2019
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The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?

   
(a) (b)
   
(c) (d)

1. (a) and (d)
2. (a), (b), (c), and (d)
3. (a) and (b)
4.  only (a)

Subtopic:  AC Generator |
 70%
From NCERT
NEET - 2019
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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. The potential difference across \(L\), \(C\) and \(R\) is \(40~\text{V}\), \(10~\text{V}\) and \(40~\text{V}\), respectively. The amplitude of the current flowing through the \(LCR\) series circuit is \(10\sqrt{2}~\text{A}\). The impedance of the circuit will be:

      
1. \(4~\Omega\)
2. \(5~\Omega\)
3. \(4\sqrt{2}~\Omega\)
4. \(\frac{5}{\sqrt{2}}~\Omega\)

Subtopic:  Different Types of AC Circuits |
From NCERT
NEET - 2021
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A step-down transformer connected to an AC mains supply of \(220~\text{V}\) is made to operate at \(11~\text{V}\), \(44~\text{W}\) lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
1. \(2~\text{A}\)
2. \(4~\text{A}\)
3. \(0.2~\text{A}\)
4. \(0.4~\text{A}\)
Subtopic:  Transformer |
 65%
From NCERT
NEET - 2021
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A series LCR circuit containing \(5.0~\text{H}\) inductor, \(80~\mu \text{F}\) capacitor and \(40~\Omega\) resistor is connected to \(230~\text{V}\) 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:

1. \(46~\text{rad/s}~\text{and}~54~\text{rad/s}\)
2. \(42~\text{rad/s}~\text{and}~58~\text{rad/s}\)
3. \(25~\text{rad/s}~\text{and}~75~\text{rad/s}\)
4. \(50~\text{rad/s}~\text{and}~25~\text{rad/s}\)

Subtopic:  Different Types of AC Circuits |
From NCERT
NEET - 2021
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The peak voltage of the AC source is equal to:
 
1. \(1 / \sqrt{2}\) times the rms value of the AC source
2. the value of voltage supplied to the circuit
3. the rms value of the AC source
4. \(\sqrt{2}\) times the rms value of the AC source
Subtopic:  RMS & Average Values |
 75%
From NCERT
NEET - 2022
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A series \(LCR\) circuit with inductance \(10~\mathrm{H}\), capacitance \(10~\mu F\), resistance \(50~\Omega\) is connected to an AC source of voltage, \(V=200 \sin (100 t) \text { volt }\). If the resonant frequency of the \(LCR\) circuit is \(\nu_0\) and the frequency of the AC source is \(\nu\), then:
 
1. \(\nu=100 \mathrm{~Hz} ; ~\nu_0=\frac{100}{\pi} \mathrm{~Hz}\)
2. \(\nu_0=\nu=50 \mathrm{~Hz}\)
3. \(\nu_0=\nu=\frac{50}{\pi} \mathrm{Hz}\)
4. \(\nu_{0}=\frac{50}{\pi}~ \mathrm{Hz}, \nu=50 \mathrm{~Hz}\)
Subtopic:  Different Types of AC Circuits |
 71%
From NCERT
NEET - 2022
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