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Physics - Mechanical Properties of Fluids

Practise 43 WBJEE previous year questions on Mechanical Properties of Fluids, compiled from papers spanning 2009 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty WBJEE tests.

Mechanical Properties of Fluids has been asked in 18 of the 18 years of WBJEE papers analysed (2009–2026), with 43 questions in all. 26% of them were easy, 58% moderate and 16% tough. Most of its questions came from 2014, with 5 questions that year. In the last three years (2024–2026) it had 9 questions across 3 papers, about 3 per paper.

The chapter's 7 topics are not weighted equally: Archmidies Principle (13 questions, 30%), Viscosity (10 questions, 23%), and Surface tension (10 questions, 23%) have been asked the most. Over the last five years the most frequent topics have been Viscosity (2), Archmidies Principle (2), and Surface tension (2). Archmidies Principle has produced the most tough questions (3).

  1. 1Which one of the following graphs represents the velocity-time graph of a small spherical body falling in a viscous liquid?2026Viscosity
  2. 2Two spherical soap bubbles of radii and in vaccum coalesce under isothermal condition. The newly formed bubble has a radius given by2026Surface tension
  3. 3A pipe A is connected with other pipes B and C as shown in the figure. The areas of cross-section of A, B and C are respectively and . If th2026Hydrodynamics
  4. 4A body of density ' ' is dropped slowly on the surface of a lake of depth . If the density of the water be ' ' then the time taken by the bo2026Archmidies Principle
  5. 5Three different liquids are filled in a U-tube as shown in figure. Their densities are and respectively. From the figure we may conclude tha2025Pressure and thrust
  6. 6A piece of granite floats at the interface of mercury and water contained in a beaker as in figure. If the densities of granite, water and m2025Archmidies Principle
  7. 7A body floats with of its volume keeping outside of water. If the body has been taken to height h inside water and released, it will come to2024Pascal's Law
  8. 8Water in filled in a cylindrical vessel of height H. A hole is made at height z from the bottom, as shown in the figure. The value of of z f2024Efflux of liquid
  9. 9A metal plate of area rests on a lauer of castor oil, thick whose coefficient of viscosity is . The approximate horizontal force required to2024Viscosity
  10. 10A shown in the figure, a liquid is at same levels in two arms of a U-tube of uniform cross-section when at rest. If the \(U\)-tube moves wit2023Pascal's Law
  11. 11As shown in the figure, a pump is designed as horizontal cylinder with a piston having area A and an outlet orifice having an area ' \(a\) '2023Hydrodynamics
  12. 1227 drops of mercury coalesce to form a bigger drop. What is the relative increase in surface energy?2022Surface tension
  13. 13Two solid spheres and of same uniform density fall from rest under gravity in a viscous medium and after some time, reach terminal velocitie2021Viscosity
  14. 14Under isothermal conditions, two soap bubbles of radii a and b coalesce to form a single bubble of radius c. If the external pressure is , t2021Surface tension
  15. 15Which of the following diagrams correctly shows the relation between the terminal velocity of a spherical body falling in a liquid and visco2020Viscosity
  16. 16A small spherical body of radius and density p moves with the terminal velocity in a fluid of coefficient of viscosity and density . What wi2019Archmidies Principle
  17. 17What will be the approximate terminal velocity of a rain drop of diameter , when density of rain water and the coefficient of viscosity of a2018Viscosity
  18. 18A uniform capillary tube of length and inner radius with its upper end sealed is submerged vertically into water. The outside pressure is an2017Surface tension
  19. 19A gas bubble of diameter rises througha liquid of density with a fixed speed of . Neglect the density of the gas. The coefficient of viscosi2016Viscosity
  20. 201000 droplets of water having diameter each coalesce to form a single drop. Given the surface tension of water is . The energy loss in the p2016Surface tension
  21. 21A drop of water detaches itself from the exit of a tap when surface tension of water, density of water, radius of the tap exit, radius of th2016Surface tension
  22. 22hollow sphere of external radius and thickness is made of a metal of density . The sphere will float in water, if2015Archmidies Principle
  23. 23A long capillary tube is dipped vertically in water and the liquid rises upto If the entire system is kept is a freely falling platform, the2015Surface tension
  24. 24A cylinder of height his filled with wator and is kept on a block of height The level of water in the cylinder is kept constant. Four holes 2015Efflux of liquid
  25. 25A small metal sphere of radius is falling with a velocity through a vertical column of a viscous liquid. If the coefficient of viscosity of 2014Viscosity
  26. 26A wooden block is floating on water kept in a beaker. of the block is above the water surface. Now the beaker is kept inside a lift that sta2014Archmidies Principle
  27. 27A uniform rod is suspended horizontally from its mid-point. A piece of metal whose weight is is suspended at a distance from the mid-point. 2014Archmidies Principle
  28. 28A drop of some liquid of volume is placed on the surface of a glass slide. Then another glass slide is placed on it in such a way that the l2014Surface tension
  29. 29To determine the composition of a bimetallic alloy, a sample is first weighed in air and then in water. These weights are found to be and re2014Archmidies Principle
  30. 30Two soap bubbles of radii and are arrangement shown in the diagram. The valve is now opened. Then which one of the following will result.2013Surface tension
  31. 31Water is flowing in streamline motion through a horizontal tube. The pressure at a point in the tube is where the velocity of flow is . At a2013Hydrodynamics
  32. 32Two spheres of the same material, but of radii and are allowed to fall vertically downwards through a liquid of density . The ratio of their2013Viscosity
  33. 33A cylindrical block floats vertically in a liquid of density kept in a container such that the fraction of volume of the cylinder inside the2013Archmidies Principle
  34. 34Water is flowing through a very narrow tube. The velocity of water below which the flow remains a streamline flow is known as2012Hydrodynamics
  35. 35A body when fully immersed in a liquid of specific gravity 1.2 weighs 44 gwt. The same body when fully immersed in water weighs 50 gwt. The 2012Archmidies Principle
  36. 36A stone of relative density \( {K}\) is released from rest on the surface of a lake. If viscous effects are ignored, the stone sinks in wate2011Archmidies Principle
  37. 37An object weighs \( {m}_1\) in a liquid of density \( {d}_1\) and that in liquid of density \( {d}_2\) is \( {m}_2\). The density \(d\) of t2011Archmidies Principle
  38. 38A body floats in water with \(40 \%\) of its volume outside water. When the same body floats in an oil, \(60 \%\) of its volume remains outs2011Archmidies Principle
  39. 39Two soap bubbles of radii \( {x}\) and \( {y}\) coalesee to constitute a bubble of radius \( {z}\). Then \( {z}\) is requal to2011Surface tension
  40. 40A body floats in water with of its volume outside water. When the same body floats in oil, of its volume remains outside oil. The relative d2010Archmidies Principle
  41. 41A uniform long tube is bent into a circle of radius and it lies in vertical plane. Two liquids of same volume but densities and fill half th2010Pressure and thrust
  42. 42Two solid spheres of same metal but of mass and fall simultaneously on a viscous liquid and their terminal velocities are and then value of 2010Viscosity
  43. 43Two spheres of equal masses but radii and are allowed to fall in a liquid of infinite column. The ratio of their terminal velocities is2009Viscosity

Frequently Asked Questions

1.How many questions are available for Mechanical Properties of Fluids?

This chapter includes 43 questions compiled from WBJEE papers spanning 2009 to 2026.

2.Are these questions only from WBJEE, or from other exams too?

These are WBJEE questions specifically for the Mechanical Properties of Fluids chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Mechanical Properties of Fluids an important chapter for WBJEE Physics?

Mechanical Properties of Fluids has appeared in 18 of the 18 years of WBJEE papers covered here, with 43 questions across 18 papers - about 2 per paper it appears in.

4.What is the difficulty level of Mechanical Properties of Fluids questions in WBJEE?

Of the 43 questions analysed for this chapter, 26% are easy, 58% moderate and 16% tough. 2014 had the most, with 5 questions.

5.Which topics in Mechanical Properties of Fluids should I focus on?

These topics have carried the most weightage in Mechanical Properties of Fluids:

  • Archmidies Principle - 13 questions (30%)
  • Viscosity - 10 questions (23%)
  • Surface tension - 10 questions (23%)
  • Archmidies Principle has produced the most tough questions (3).
6.Is Mechanical Properties of Fluids's weightage in WBJEE going up or down?

Across all 18 papers analysed, Mechanical Properties of Fluids has averaged about 2.4 questions per paper. In the last three years (2024–2026), that average has risen, at about 3.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.