JEE Main 2022 — Mechanical Properties of Fluids Question with Solution
JEE Main 2022 (29 Jul Shift 1)
Question
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Clothes containing oil or grease stains cannot be cleaned by water wash.
Reason (R) : Because the angle of contact between the oil/ grease and water is obtuse. In the light of the above statements, choose the correct answer from the option given below.
Choose an option
Show full solutionCorrect option: A
Step-by-step explanation
Angle of contact between oil and water is obtuse i.e., greater than critical angle of contact , therefore they do not stick and that's the reason grease/oil stains can not be removed by water wash.
Thus, both (A) and (R) are true and (R) is the correct explanation of (A).
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This is a previous-year question from JEE Main 2022, covering the Mechanical Properties of Fluids 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.