Errors in Measurement - NEET Previous Year Questions with Solutions

When a physical quantity Z = Aᵐ × Bⁿ / Cᵖ, the percentage error in Z equals m×(%ΔA) + n×(%ΔB) + p×(%ΔC). The power of each variable acts as a multiplier for its percentage error. This rule applies whether the variable is in the numerator or denominator — errors always add, never subtract. This is the single most tested concept in NEET error questions.

Absolute error is the magnitude of the difference between the measured value and the true value (ΔA = |A_true − A_measured|). Relative error is the ratio of absolute error to the true value (ΔA/A). NEET questions often ask for percentage error, which is simply relative error multiplied by 100. Knowing which form the question asks for in the final step prevents common calculation mistakes.

Typically 1–2 questions come from the Errors in Measurement topic in NEET Physics each year. These questions are part of the broader Units and Measurements chapter, which itself contributes 2–3 questions per exam. Since NTA has consistently included error propagation questions since 2017, this sub-topic is considered high-priority for NEET aspirants.

eSaral's NEET PYQ bank covers all sub-topics of Units and Measurements — including dimensional analysis, significant figures, and measuring instruments — alongside errors. You can access chapter-wise PYQs with solutions in the eSaral app. The NCERT Solutions for Class 11 Physics also provide a solid conceptual base for every question type NTA has set from this chapter

For NEET, students must know: (1) Absolute error, (2) Mean absolute error, (3) Relative/Fractional error, (4) Percentage error, (5) Systematic error, and (6) Random error. Gross errors are rarely tested. The calculation-based questions almost always involve the first four types. Systematic vs. random error appears in conceptual MCQs asking students to identify error sources or suggest remedies.

It cannot be skipped. Errors in Measurement appears in NEET almost every year, and the questions are formulaic — meaning with the right preparation, they are near-certain marks. The topic takes 3–4 hours to master fully, offering one of the best effort-to-mark ratios in the entire NEET Physics syllabus. Skipping it is strategically unsound.