JEE Main 2020PhysicsMathematics in PhysicsEasyMCQ

JEE Main 2020 — Mathematics in Physics Question with Solution

JEE Main 2020 (09 Jan Shift 2)

Question

For the four sets of three measured physical quantities as given below. Which of the following options is correct?
i A1=24.36,B1=0.0724,C1=256.2
ii A2=24.44,B2=16.082,C2=240.2
iii A3=25.2,B3=19.2812,C3=236.183
iv A4=25,B4=236.191,C4=19.5

Choose an option

Show full solutionCorrect option: C
Correct answer
CA1+B1+C1<A2+B2+C2=A3+B3+C3<A4+B4+C4

Step-by-step explanation

In addition or subtractions, final answer must contain the equal numbers of digits after decimal as the adding or subtracting quantities among which is having the lowest numbers of digits after decimal.

A1+B1+C1=24.36+0.0724+256.2=280.6324=280.6

The Least number of  significant digit after decimal  in the above expression is 1 So, Sum should conatian 1 significant digit after decimal.
A2+B2+C2=24.44+16.082+240.2=280.722=280.7

The Least number of  significant digit after decimal  in the above expression is 1 So, Sum should conatian 1 significant digit after decimal
A3+B3+C3=25.2+19.2812+236.183=280.6642=280.7

The Least number of  significant digit after decimal  in the above expression is 1 So, Sum should conatian 1 significant digit after decimalA4+B4+C4=25+236.191+19.5=280.691=281

The Least number of  significant digit after decimal  in the above expression is 0 So, Sum should conatian 0 significant digit after decimal
Answer should be A1+B1+C1<A2+B2+C2=A3+B3+C3<A4+B4+C4

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About this question

This is a previous-year question from JEE Main 2020, covering the Mathematics in Physics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.