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JEE Main Physics PYQ Practice

JEE Main Physics Units and Measurements Previous Year Questions

Use this page to practise authentic previous-year-question patterns, identify the exact concept tested and revise the rules behind dimensions, significant figures, unit conversion and error analysis.

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Chapter-Wise PYQs

Why solve Units and Measurements PYQs?

Previous-year questions show how an exam converts basic measurement rules into short, high-accuracy questions. The chapter may be brief, but its unit, precision and dimensional-analysis skills support calculations across Physics.

Do not use PYQs only to memorise answers. For each question, identify the exact rule being tested, solve it without hints, and record the source paper before adding it to your revision list.

Student-first use: This page is structured as a learning resource: concept mapping, a verification checklist, worked reasoning and a reattempt plan—not merely a list of questions.
Accuracy and Attribution

How PrepMocker should label PYQs

Only publish a question as a JEE Main PYQ after checking it against the relevant official paper or a reliable archival copy. Every authentic question should display its exam date, session and shift wherever that information is available.

Publishing rule: Do not call original or paraphrased questions “previous-year questions.” Label them clearly as “JEE Main-style practice” or “pattern-based practice.” Do not invent years, shifts, marks or official paper references.
  • Store a source record for each PYQ: year, session, date, shift, question number and source document.
  • Show the paper label alongside the question on the live page.
  • Preserve the original meaning; if you simplify wording, identify it as an adapted learning version.
  • Write your own detailed explanation, concept tag and common-error note.
  • Remove any unverified question rather than guessing its source.
What PYQs Test

Recurring question patterns

Dimensional formulae

Derive dimensions using a defining physical relation instead of recalling isolated formulas.

Consistency checks

Check whether every term in an equation has the same dimensions.

Significant figures

Count meaningful digits and apply rounding correctly after calculations.

Errors

Choose absolute-error rules for sums and fractional-error rules for products or quotients.

Unit conversion

Apply powers to the conversion factor for derived units, area and volume.

Instrument precision

Interpret least count, measurement precision and realistic limitations.

PYQ Strategy

How to practise this chapter effectively

  1. Attempt each verified PYQ in about one minute before opening any solution.
  2. Tag it: dimensions, conversion, significant figures, error propagation or least count.
  3. For every mistake, write one line explaining the rule you missed.
  4. Solve two fresh original questions on the same rule, then return to the PYQ after a revision gap.
  5. Keep a separate list of guessed answers; a correct guess still needs review.

Example: for an area conversion, do not merely remember “square the factor.” Write the chain: 1 m = 100 cm, therefore 1 m² = (100 cm)² = 10⁴ cm². This makes the rule reliable in unfamiliar units.

Practice Format

Verified PYQs and pattern-based practice

Replace the demonstration cards below with your own source-verified JEE Main PYQs before you publish them as official previous-year questions. The two labelled practice questions are original and safe to publish now.

Original JEE Main-style practice · Not an official PYQ
Practice 1 · Dimensions

The dimensions of impulse are the same as those of:

A. Force
B. Momentum
C. Work
D. Power
Show solution

Answer: B. Impulse equals force multiplied by time. Its dimensions are [M L T-2][T] = [M L T-1], the dimensions of momentum.

Original JEE Main-style practice · Not an official PYQ
Practice 2 · Error Propagation

If R = A/B and the percentage errors in A and B are 3% and 2%, respectively, the maximum percentage error in R is:

A. 1%
B. 5%
C. 6%
D. 12%
Show solution

Answer: B. For a quotient, maximum fractional or percentage errors add. Hence, error in R = 3% + 2% = 5%.

Editor instruction: Add your verified PYQs here one at a time. Use this source format above every official item: “JEE Main [year] · [session] · [date] · Shift [number] · Question [number].” If any detail is unavailable, say “source metadata being verified” and do not present it as a confirmed PYQ.

Want a timed chapter test?

After reviewing source-labelled PYQs, use a fresh timed test to check whether you can apply the rules without remembering an earlier answer.

Try the Units and Measurements Mock Test
FAQs

JEE Main Units and Measurements PYQs FAQs

Are all questions on this page official JEE Main PYQs?

No. Only questions carrying a verified paper source should be called official previous-year questions. Original items must remain clearly labelled as JEE Main-style practice.

Which topics should I revise before PYQs?

Revise SI units, dimensions, dimensional analysis, significant figures, least count, unit conversion, absolute error and percentage-error propagation.

Can dimensional analysis prove a full Physics equation?

No. It can check dimensional consistency and help determine some forms of relations, but it cannot determine dimensionless constants or confirm all physical conditions.

How many times should I reattempt PYQs?

Attempt once without help, review your errors, and then reattempt after a meaningful revision gap. The goal is to reconstruct the method rather than remember an option.