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Mechanical Properties of Fluids

JEE Main 2025 (Online) 22nd January Evening ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2025, 22 January (Evening Shift)

A tube of length L is shown in the figure. The radius of cross section at the point (1) is 2 cm and at the point (2) is 1 cm , respectively. If the velocity of water entering at point (1) is 2 m/s, then velocity of water leaving the point (2) will be [figure]

  1. 4 m/s
  2. 6 m/s
  3. 2 m/s
  4. 8 m/s

Answer

(4) 8 m/s

Solution

[figure]

Continuity: A1v1=A2v2 v2=v1 ( r1r2 )2

v2=2 ( 21 )2=8 m/s

Answer: (4)

Keep practising — Mechanical Properties of Fluids

Ques. 2JEE Main 2025, 22 January (Evening Shift)

A small rigid spherical ball of mass M is dropped in a long vertical tube containing glycerine. The velocity of the ball becomes constant after some time. If the density of glycerine is half of the density of the ball, then the viscous force acting on the ball will be (consider g as acceleration due to gravity)

  1. 2Mg
  2. 32Mg
  3. Mg2
  4. Mg

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