Transformer Absorb Before You Solve MCQs 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

Q1:

A transformer is used to light a $100~\text{W}$ and $110~\text{V}$ lamp from a $220~\text{V}$ main. If the main current is $0.5~\text{A},$ the efficiency of the transformer is approximately:
1. $30\%$
2. $50\%$
3. $90\%$
4. $10\%$

Subtopic: Transformer |

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AIPMT - 2007

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Q2:

The primary has

100

$100$ turns with

100

$100$ V RMS applied to it while the secondary has a total number of

20

$20$ turns, with the connection

C

$C$ made at the centre. The current

i

$i$ flowing towards

C

$C$ has the (RMS) value:

1.	$2$ A	2.	$2\sqrt2$ A
3.	$\sqrt2$ A	4.	zero

Subtopic: Transformer |

52%

From NCERT

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Q3:

The primary coil of a transformer, when connected to a

10 V -

$10~\text{V}\text-$ DC battery, draws a current of

1 mA .

$1~\text{mA}.$ The number of turns in the primary and secondary coils are

50

$50$ and

100,

$100,$ respectively. The voltage across the secondary coil and the current drawn by the circuit in the secondary are respectively:

1.	$20~\text{V}$ and $2.0~\text{mA}$
2.	$10~\text{V}$ and $0.5~\text{mA}$
3.	zero and therefore no current
4.	$20~\text{V}$ and $0.5~\text{mA}$

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From NCERT

NEET - 2013

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Q4:

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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From NCERT

NEET - 2023

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