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Mechanical Properties of Fluids

JEE Main 2024 (Online) 29th January Evening ShiftMCQEasy📈 Topic in 26% papers+4−1
Ques. 1JEE Main 2024, 29 January (Evening Shift)

A small liquid drop of radius R is divided into 27 identical liquid drops. If the surface tension is T, then the work done in the process will be:

  1. 4 R2T
  2. 8 R2T
  3. 18 R2T
  4. 3 R2T

Answer

(2) 8 R2T

Solution

Volume remains constant: 43 R3=27 43 r3 r= R3

Increase in surface area: A=27(4 r2)-4 R2

=27 4 R29-4 R2=8 R2

Work done = surface tension × increase in surface area

W=T A=8 R2T

Answer: (2)

Keep practising — Mechanical Properties of Fluids

Ques. 2JEE Main 2024, 27 January (Morning Shift)

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

  1. Statement I is correct but statement II is incorrect
  2. Statement I is incorrect but Statement II is correct
  3. Both Statement I and Statement II are incorrect
  4. Both Statement I and Statement II are correct
Ques. 3JEE Main 2024, 27 January (Evening Shift)

The reading of pressure metre attached with a closed pipe is 4.5 104 N/m2. On opening the valve, water starts flowing and the reading of pressure metre falls to 2.0 104 N/m2. The velocity of water is found to be V m/s. The value of V is .

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