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MCQEasyJEE 2023Fluid Pressure & Pascal's Law

JEE Physics 2023 Question with Solution

Given below are two statements: one is labelled as Assertion AA and the other is labelled as Reason RR.

Assertion AA: When you squeeze one end of a tube to get toothpaste out from the other end, Pascal's principle is observed.

Reason RR: A change in the pressure applied to an enclosed incompressible fluid is transmitted undiminished to every portion of the fluid and to the walls of its container.

In the light of the above statements, choose the most appropriate answer from the options given below:

  • A

    A is correct but R is not correct

  • B

    Both A and R are correct and R is the correct explanation of A

  • C

    A is not correct but R is correct

  • D

    Both A and R are correct but R is NOT the correct explanation of A

Answer

Correct answer:A

Step-by-step solution

Standard Method

Given: Assertion AA states that when toothpaste is squeezed out of a tube, Pascal's principle is observed.

Find: Which option correctly describes the truth of Assertion AA and Reason RR.

As per Pascal's law, when pressure is applied to an enclosed incompressible fluid, the pressure change is transmitted equally throughout the fluid and to the walls of the container.

The pressure change inside the toothpaste tube allows the toothpaste to be squeezed out from the other end.

Therefore, both Assertion AA and Reason RR are true, and Reason RR is the correct explanation of Assertion AA.

Common mistakes

  • Assuming that squeezing toothpaste is unrelated to Pascal's principle. This is wrong because the applied pressure is transmitted through the enclosed paste-like fluid. Instead, connect the situation to pressure transmission in enclosed fluids.

  • Treating the reason as only a definition with no link to the assertion. This is wrong because the reason directly explains why toothpaste comes out when pressure is applied. Instead, check whether the stated law accounts for the described effect.

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