Physics · JEE

Important Questions: Least count, significant figures, Errors in measurements for JEE

12+ syllabus-aligned questions available

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The most important Least count, significant figures, Errors in measurements questions for JEE cover conceptual traps, standard results, and numerical patterns from Least count, significant figures, Errors in measurements. Goodmarks provides 12+ high-yield MCQs with full solutions.

Focus on what matters most. These important Least count, significant figures, Errors in measurements questions cover high-weightage concepts from Least count, significant figures, Errors in measurements — the topics JEE repeats every year.

Syllabus context

Part of Units and Measurements in JEE Main Physics.

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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 makes a Least count, significant figures, Errors in measurements question "important" for JEE?

Important questions test core concepts that appear frequently across JEE Main and Advanced papers — definitions, standard formulas, and classic problem types.

Which subtopics in Units and Measurements are high-weightage?

Key areas include Least count, significant figures, Errors in measurements. Prioritise these before moving to edge cases.

How many important questions should I revise?

Revise 30–50 important MCQs per unit in the last month before JEE. Focus on questions you got wrong at least once.

Can I practise only important questions on Goodmarks?

Pro users can filter by unit and subtopic to target high-yield areas. Free users can attempt sample questions on this page.