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Units and Measurement — NEET & JEE 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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Read the chapter first

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

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Questions

How many NEET and JEE 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 and JEE 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.