- Exam
- JEE Main
- Year
- 2022
- Date
- 29 July
- Shift
- Morning Shift
- Subject
- Physics
- Chapter
- Mechanical Properties of Fluids
JEE Main 2022 · 29 July · Morning Shift · Physics · Mechanical Properties of Fluids
Given below are two statements: One is labelled as Assertion (A)...
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.
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is true but (R) is true
Correct answer
A. Both (A) and (R) are true and (R) is the correct explanation of (A)
Step-by-step solution
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).