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Units and Measurement — NEET Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

What must accompany the numerical value when a physical measurement is reported?
  1. An accepted unit ✓
  2. The instrument's colour
  3. The observer's name
  4. A second unrelated measurement
Answer: A. A measurement compares a quantity with an accepted reference standard, so its result is a number accompanied by a unit. The bare number cannot identify the physical scale.
Why not B: Instrument colour carries no scale information and cannot define the measured quantity.
Why not C: Observer identity may belong in records but is not part of a physical value.
Why not D: A separate measurement does not supply the comparison standard required by the number.
Using the round-half-to-even convention, what is 2.745 rounded to three significant figures?
  1. 2.73
  2. 2.75
  3. 2.74 ✓
  4. 2.70
Answer: C. When the first discarded digit is exactly 5, an even preceding digit is left unchanged. Thus 2.745 becomes 2.74, whereas 2.735 would become 2.74 by raising odd 3.
Why not A: This lowers the retained hundredths digit instead of simply dropping a tied 5.
Why not B: This always rounds a terminal 5 upward and ignores that the preceding digit 4 is even.
Why not D: This discards a significant hundredths digit in addition to the one uncertain digit.
Lead has relative density 11.3. What is its density in SI units?
  1. 1.13 × 10⁴ kg m⁻³ ✓
  2. 1.13 × 10³ kg m⁻³
  3. 1.13 × 10² kg m⁻³
  4. 1.13 × 10⁵ kg m⁻³
Answer: A. Relative density is the ratio to water, whose density is 10³ kg m⁻³. Thus 11.3 × 10³ = 1.13 × 10⁴ kg m⁻³.
Why not B: This multiplies by 100 kg m⁻³ instead of water's 1000 kg m⁻³.
Why not C: This converts 11.3 g cm⁻³ with only one power of ten instead of three.
Why not D: This inserts an extra factor of ten while converting from g cm⁻³.

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Every NCERT question in this chapter is solved, free: NCERT solutions — Units and Measurement →

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Questions

How many NEET questions are there on Units and Measurement?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.