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Friday, 9 October

NEET UG 2021 · Physics · Question 39

NEET 2021 Physics, question 39

Question 39 of the NEET 2021 paper (code O1) is a Physics question from Alternating Current. Its idea, Ideal Transformer, was asked 3 times, in 2021, 2023 and 2024, across NEET 2017–2026. The NTA final answer key gives option 3.

Updated 2026-10-08

Q39 · Physics

A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit ?

  1. 12 A
  2. 24 A
  3. 30.2 AOfficial answer
  4. 40.4 A

Official answer: option 3 · NTA final answer key

Same idea

Ideal Transformer, in other papers

NEET asked this idea 3 times, in 2021, 2023 and 2024. The other 2 questions below.

  • 2024 Q22In an ideal transformer, the turns ratio is NpNs=12\frac{N_p}{N_s} = \frac{1}{2}. The ratio Vs:VpV_s : V_p is equal to (the symbols carry their…Numerical · Easy
  • 2023 Q4A 12 V, 60 W lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of 220 V. Assuming the…Numerical · Easy

Ideal Transformer: every question and how it was framed

The chapter

Alternating Current in ten years of NEET

15 questions from 2017–2026, asked in 8 of 10 papers, about 1.4 a paper. LCR Circuits alone had 15.

Chapter analysisStudy this chapterPractise this chapter

Alternating Current: questions per paper

0240’171’180’192’203’212’223’232’241’251’26