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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: Â AC vs DC |

Â 78%

From NCERT

NEET - 2019

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In a heating arrangement, an alternating current having a peak value of \(28~\text{A}\) is used. To produce the same heat energy, if direct current is used to produce the same amount of heat, then its magnitude will be:

1. | \(14~\text{A}\) | about2. | \(28~\text{A}\) | about

3. | \(20~\text{A}\) | about4. | cannot say |

Subtopic: Â AC vs DC |

Â 56%

From NCERT

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A light bulb is rated at \(100~\text{W}\) for a \(220~\text{V}\) AC supply. The RMS current through the bulb is:

1. \(0.243\) A

2. \(0.454\) A

3. \(0.222\) A

4. \(0.312\) A

Subtopic: Â RMS & Average Values |

Â 79%

From NCERT

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In an AC circuit, an alternating voltage \(\varepsilon=200 \sqrt{2} \sin (100 t)~\text{V}\) is connected to a capacitor of capacity \(1~\mu \text{F}.\) The RMS value of the current in the circuit is:

1. | \(100~\text{mA}\) | 2. | \(200~\text{mA}\) |

3. | \(20~\text{mA}\) | 4. | \(10~\text{mA}\) |

Subtopic: Â RMS & Average Values |Â Different Types of AC Circuits |

Â 76%

From NCERT

AIPMT - 2011

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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: Â RMS & Average Values |

Â 76%

From NCERT

NEET - 2022

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

1. \(0.707\) A

2. \(1\) A

3. \(1.414\) A

4. \(2\) A

1. \(0.707\) A

2. \(1\) A

3. \(1.414\) A

4. \(2\) A

Subtopic: Â RMS & Average Values |

Â 70%

From NCERT

NEET - 2022

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An AC source is rated \(220~\mathrm{V}\), \(50~\mathrm{Hz}\). The average voltage is calculated in a time interval of \(0.01~\mathrm{s}\). It,

1. | must be zero |

2. | may be zero |

3. | is never zero |

4. | \(220\sqrt{2}\) V | is

Subtopic: Â RMS & Average Values |

Â 52%

From NCERT

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A \(15.0~\mathrm{\mu F}\) capacitor is connected to a \(220~\mathrm{V}\), \(50~\mathrm{Hz}\) source. If the frequency is doubled, what happens to the capacitive reactance and the current?

1. | the capacitive reactance is halved and the current is doubled. |

2. | the capacitive reactance is doubled and the current is halved. |

3. | the capacitive reactance remains the same and the current is doubled. |

4. | the current remains the same and the capacitive reactance is halved. |

Subtopic: Â Different Types of AC Circuits |

Â 78%

From NCERT

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A resistor of \(200~\mathrm{\Omega}\) and a capacitor of \(15.0~\mu\text{F}\) are connected in series to a \(220~\text{V}\), \(50\) Hz AC source. The voltage (RMS) across the resistor and the capacitor are respectively:

1. \( 160.3 ~\text{V}, 160.3 ~\text{V} \)

2. \( 151 ~\text{V}, 151 ~\text{V} \)

3. \( 160.3 ~\text{V}, 151 ~\text{V} \)

4. \( 151 ~\text{V}, 160.3 ~\text{V}\)

Subtopic: Â Different Types of AC Circuits |

From NCERT

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An AC source is connected to the given circuit. The value of \(\phi\) will be:

1. | \(60^\circ\) | 2. | \(90^\circ\) |

3. | \(30^\circ\) | 4. | \(45^\circ\) |

Subtopic: Â Different Types of AC Circuits |

Â 63%

From NCERT

NEET - 2023

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