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Q. No.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: Â Transformer |
 70%
From NCERT
NEET - 2021
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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. | \(\dfrac{5}{\sqrt{2}}~\Omega\) |
Subtopic: Â Different Types of AC Circuits |
From NCERT
NEET - 2021
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At an airport, a person is made to walk through the doorway of a metal detector, for security reasons. If she/he is carrying anything made of metal, the metal detector emits a sound. On what principle does this detector work?
| 1. | resonance in AC circuits |
| 2. | logic gate |
| 3. | x-rays |
| 4. | none of the above |
 84%
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The magnetic field energy in an inductor changes from maximum value to minimum value in \(5.0\) ms when connected to an AC source. The frequency of the source is:
1. \(20\) Hz
2. \(50\) Hz
3. \(200\) Hz
4. \(500\) Hz
1. \(20\) Hz
2. \(50\) Hz
3. \(200\) Hz
4. \(500\) Hz
From NCERT
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An inductor, a resistor and a capacitor are joined in series with an AC source. As the frequency of the source is slightly increased from a very low value, the reactance,
Choose the correct options:
| (a) | of the inductor increases. |
| (b) | of the resistor increases. |
| (c) | of the capacitor increases. |
| (d) | of the circuit increases. |
| 1. | (a) only | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (a), (d) |
Subtopic: Â Different Types of AC Circuits |
 61%
From NCERT
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The rms value of the potential difference \(V\) shown in the figure is:
| 1. | \(\dfrac{V_{0}}{\sqrt{3}}\) | 2. | \(V_{0}\) |
| 3. | \(\dfrac{V_{0}}{\sqrt{2}}\) | 4. | \(\dfrac{V_{0}}{2}\) |
Subtopic: Â RMS & Average Values |
 74%
From NCERT
AIPMT - 2011
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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: Â Different Types of AC Circuits |
 64%
From NCERT
NEET - 2020
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A transformer with \(8:1\) turns ratio has \(50~\text{Hz},\) \(100~\text V\) input. The frequency of the output is:
1. \(40~\text{Hz}\)
2. \(50~\text{Hz}\)
3. \(400~\text{Hz}\)
4. \(500~\text{Hz}\)
1. \(40~\text{Hz}\)
2. \(50~\text{Hz}\)
3. \(400~\text{Hz}\)
4. \(500~\text{Hz}\)
Subtopic: Â Transformer |
 78%
From NCERT
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Which of the following graphs best represents the variation of impedance \((Z)\) in an \(LCR\) series circuit as a function of the frequency \((f)\) of the applied AC source?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â Different Types of AC Circuits |
 77%
From NCERT
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An AC supply is connected across a series \(LCR\) circuit. If the capacitor is removed, then which of the following phasor diagram may be correct for the remaining circuit?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â Different Types of AC Circuits |
From NCERT
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