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In an ideal transformer, the turns ratio is \(\cfrac{N_p}{N_s}=\cfrac{1}{2} .\) The ratio \(V_s:V_p\) is equal to (the symbols carry their usual meaning):

1. \(2:1\)

2. \(1:1\)

3. \(1:4\)

4. \(1:2\)

1. \(2:1\)

2. \(1:1\)

3. \(1:4\)

4. \(1:2\)

Subtopic: Transformer |

64%

From NCERT

NEET - 2024

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

1. \(0.93~\text A\)

2. \(1.20~\text A\)

3. \(0.35~\text A\)

4. \(0.58~\text A\)

1. \(0.93~\text A\)

2. \(1.20~\text A\)

3. \(0.35~\text A\)

4. \(0.58~\text A\)

Subtopic: RMS & Average Values |

54%

From NCERT

NEET - 2024

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\(L,C\) and \(R\) represent the value of inductance, capacitance and resistance, respectively. The factor which has the same dimensions as that of the inverse of resonance frequency is:

1. \(\sqrt{LC}\)

2. \(\sqrt{\dfrac{L}{C}}\)

3. \(\dfrac{C}{L}\)

4. \(\dfrac{R}{L}\)

1. \(\sqrt{LC}\)

2. \(\sqrt{\dfrac{L}{C}}\)

3. \(\dfrac{C}{L}\)

4. \(\dfrac{R}{L}\)

Subtopic: Different Types of AC Circuits |

72%

From NCERT

NEET - 2024

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In the circuit shown below, the inductance \(L\) is connected to a source. The current flowing in the circuit is \({I=I_{0}\sin\omega t.}\) The voltage drop \((V_L)\) across \(L\) is:

1. | \(\omega L~I_0\sin\omega t\) | 2. | \(\frac{{I}_0}{\omega{L}}\sin\omega t\) |

3. | \(\frac{{I}_0}{\omega{L}}\cos\omega t\) | 4. | \(\omega L~I_0\cos\omega t\) |

Subtopic: Different Types of AC Circuits |

From NCERT

NEET - 2024

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A step-up transformer is connected to an AC mains supply of \(220~\text V\) to operate at \(11000~\text V, 88\) watt. The current in the secondary circuit, ignoring the power loss in the transformer, is:

1. \(8~\text{mA}\)

2. \(4~\text{mA}\)

3. \(0.4~\text{A}\)

4. \(4~\text{A}\)

1. \(8~\text{mA}\)

2. \(4~\text{mA}\)

3. \(0.4~\text{A}\)

4. \(4~\text{A}\)

Subtopic: Transformer |

61%

From NCERT

NEET - 2024

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

1. | capacitive reactance remains constant | 2. | capacitive reactance decreases. |

3. | displacement current increases. | 4. | displacement current decreases. |

Subtopic: Different Types of AC Circuits |

From NCERT

NEET - 2023

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

1. \(0.37~\text{A}\)

2. \(0.27~\text{A}\)

3. \(2.7~\text{A}\)

4. \(3.7~\text{A}\)

1. \(0.37~\text{A}\)

2. \(0.27~\text{A}\)

3. \(2.7~\text{A}\)

4. \(3.7~\text{A}\)

Subtopic: Transformer |

68%

From NCERT

NEET - 2023

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

1. | \(1.59~\text{kHz}\) | 2. | \(15.9~\text{rad/s}\) |

3. | \(15.9~\text{kHz}\) | 4. | \(1.59~\text{rad/s}\) |

Subtopic: Different Types of AC Circuits |

61%

From NCERT

NEET - 2023

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

1. \(25~\Omega\)

2. \(10\sqrt{2}~\Omega\)

3. \(15~\Omega\)

4. \(5\sqrt{5}~\Omega\)

1. \(25~\Omega\)

2. \(10\sqrt{2}~\Omega\)

3. \(15~\Omega\)

4. \(5\sqrt{5}~\Omega\)

Subtopic: Different Types of AC Circuits |

59%

From NCERT

NEET - 2023

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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: Different Types of AC Circuits |

63%

From NCERT

NEET - 2023

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