Recommended PYQs (STRICTLY NCERT Based) Alternating Current Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

In an ideal transformer, the turns ratio is

\frac{N_{p}}{N_{s}} = \frac{1}{2} .

$\frac{N_p}{N_s}=\frac{1}{2} .$ The ratio

V_{s} : V_{p}

$V_s:V_p$ is equal to (the symbols carry their usual meaning):
1.

2 : 1

$2:1$
2.

1 : 1

$1:1$
3.

1 : 4

$1:4$
4.

1 : 2

$1:2$

Subtopic: Transformer |

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Q2:

A

10 μ F

$10~\mu\text F$ capacitor is connected to a

210 V, 50 Hz

$210~\text V,50~\text{Hz}$ source as shown in the figure. The peak current in the circuit is nearly

(π = 3.14)

$(\pi = 3.14)$ :

1.

0.93 A

$0.93~\text A$
2.

1.20 A

$1.20~\text A$
3.

0.35 A

$0.35~\text A$
4.

0.58 A

$0.58~\text A$

Subtopic: RMS & Average Values |

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Q3:

L, C

$L,C$ and

R

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

1.	$\sqrt{LC}$	2.	$\sqrt{\dfrac{L}{C}}$
3.	$\dfrac{C}{L}$	4.	$\dfrac{R}{L}$

Subtopic: Different Types of AC Circuits |

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Q4:

In the circuit shown below, the inductance

L

$L$ is connected to a source. The current flowing in the circuit is

I = I_{0} \sin ω t .

${I=I_{0}\sin\omega t.}$ The voltage drop

(V_{L})

$(V_L)$ across

L

$L$ 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 |

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Q5:

A step-up transformer is connected to an AC mains supply of

220 V

$220~\text V$ to operate at

11000 V, 88 W .

$11000~\text V, 88~\text W.$ The current in the secondary circuit, ignoring the power loss in the transformer, is:
1.

8 mA

$8~\text{mA}$
2.

4 mA

$4~\text{mA}$
3.

0.4 A

$0.4~\text{A}$
4.

4 A

$4~\text{A}$

Subtopic: Transformer |

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Q6:

An AC source is connected to a capacitor

C

$C$ . 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 |

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Q7:

A

12 V, 60 W

$12~\text{V},60~\text{W}$ lamp is connected to the secondary of a step-down transformer, whose primary is connected to AC mains of

220 V

$220~\text{V}$ . Assuming the transformer to be ideal, what is the current in the primary winding?
1.

0.37 A

$0.37~\text{A}$
2.

0.27 A

$0.27~\text{A}$
3.

2.7 A

$2.7~\text{A}$
4.

3.7 A

$3.7~\text{A}$

Subtopic: Transformer |

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Q8:

In a series

L C R

${LCR}$ circuit, the inductance

L

${L}$ is

10 mH

$10~\text{mH}$ , capacitance

C

${C}$ is

1 μ F

$1~\mu\text{F}$ and resistance

R

${R}$ is

100 Ω

$100~\Omega$ . The frequency at which resonance occurs is:
1.

1.59 kHz

$1.59~\text{kHz}$
2.

15.9 rad/s

$15.9~\text{rad/s}$
3.

15.9 kHz

$15.9~\text{kHz}$
4.

1.59 rad/s

$1.59~\text{rad/s}$

Subtopic: Different Types of AC Circuits |

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Q9:

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

1.	$25~\Omega$	2.	$10\sqrt{2}~\Omega$
3.	$15~\Omega$	4.	$5\sqrt{5}~\Omega$

Subtopic: Different Types of AC Circuits |

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Q10:

An AC source is connected to the given circuit. The value of

ϕ

$\phi$ will be:

1.	$60^\circ$	2.	$90^\circ$
3.	$30^\circ$	4.	$45^\circ$

Subtopic: Different Types of AC Circuits |

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