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Friday, 9 October

NEET UG 2025 · Physics · Question 42

NEET 2025 Physics, question 42

Question 42 of the NEET 2025 paper (code 45) is a Physics question from Units and Measurements. Its idea, Error Propagation in Power Functions, was asked 3 times, in 2019, 2023 and 2025, across NEET 2017–2026. The NTA final answer key gives option 3.

Updated 2026-10-08

Q42 · Physics

A physical quantity PP is related to four observations aa, bb, cc and dd as follows:

P=a3b2/cdP = a^3b^2/c\sqrt{d}

The percentage errors of measurement in aa, bb, cc and dd are 1%, 3%, 2%, and 4% respectively. The percentage error in the quantity PP is

  1. 110%
  2. 22%
  3. 313%Official answer
  4. 415%

Official answer: option 3 · NTA final answer key

Same idea

Error Propagation in Power Functions, in other papers

NEET asked this idea 3 times, in 2019, 2023 and 2025. The other 2 questions below.

  • 2023 Q7A metal wire has mass (0.4±0.002)(0.4\pm0.002) g, radius (0.3±0.001)(0.3\pm0.001) mm and length (5±0.02)(5\pm0.02) cm. The maximum possible percentage error in…Numerical · Medium
  • 2019 Q44In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4%…Numerical · Easy

Error Propagation in Power Functions: every question and how it was framed

The chapter

Units and Measurements in ten years of NEET

20 questions from 2017–2026, asked in 10 of 10 papers, about 1.9 a paper. Units and Dimensions alone had 20.

Chapter analysisStudy this chapter

Units and Measurements: questions per paper

0241’171’181’193’203’213’222’233’242’251’26