Physics · JEE

Least count, significant figures, Errors in measurements Concepts for JEE

12+ syllabus-aligned questions available

Quick answer

Master Least count, significant figures, Errors in measurements by understanding definitions, standard results, and typical JEE question patterns — then practise with syllabus-aligned MCQs on Goodmarks.

Build clear conceptual foundations for Least count, significant figures, Errors in measurements before speed practice. This guide covers what JEE expects and how to test yourself with MCQs.

Concept explainer

Least count, significant figures, Errors in measurements is a core JEE Main Physics subtopic under Units and Measurements. Master the definitions, standard results, and typical MCQ patterns tested in JEE Main and Advanced.

Key points

Understand the definition and scope of Least count, significant figures, Errors in measurements in the JEE syllabus
Memorise key formulas and standard results linked to Least count, significant figures, Errors in measurements
Practise 20–40 syllabus-aligned MCQs with step-by-step solutions

JEE tips

Revise Least count, significant figures, Errors in measurements with a one-page formula sheet before attempting mixed tests
After each practice set, log mistakes specific to Least count, significant figures, Errors in measurements and reattempt after 48 hours

Common trap

Students often rush Least count, significant figures, Errors in measurements questions without checking units, sign conventions, or boundary conditions — always verify assumptions before calculating.

Syllabus context

Part of Units and Measurements in JEE Main Physics.

Free sample questions

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Q1PhysicsUnit 1: Units and Measurements

The mass of a box measured by a grocer's balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. The total mass of the box is:

Q2PhysicsUnit 1: Units and Measurements

The mass of a ball is

1.76 k g .

The mass of 25 such balls is

Q3PhysicsUnit 1: Units and Measurements

A cube has a side of length

2.342 m

. The surface area and volume in correct significant figures are respectively:

Q4PhysicsUnit 1: Units and Measurements

The radius of a sphere is measured to be

(4.0+2.0) \mathrm{cm}

the maximum percentage error in the measurement of the volume of the sphere is

Q5PhysicsUnit 1: Units and Measurements

Two students

P

and

Q

perform an experiment to verify Ohm's law for a conductor with resistance R. They use a current source and a voltmeter with least counts of

0.1 \mathrm{mA}

and

0.1 \mathrm{mV}

respectively. The plots of the variation of voltage drop(V) across R with current(i) for both are shown. the statement which is most likely to be correct is?

Q6PhysicsUnit 1: Units and Measurements

The accuracy in the measurement of the diameter of hydrogen atom measured as

1.06 \times 10^{-10} \mathrm{m}

is :

Q7PhysicsUnit 1: Units and Measurements

Three measurement are made as

18.425 \mathrm{cm} 7.21 \mathrm{cm}

and

5.0 \mathrm{cm} .

The addition should be written as then:

Q8PhysicsUnit 1: Units and Measurements

Chlorine has

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Frequently asked questions

What concepts in Least count, significant figures, Errors in measurements are essential for JEE?

Focus on core ideas across Least count, significant figures, Errors in measurements. JEE tests application, not just memorisation.