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Sunday, 25 October

JEE Main · Physics · Class 11

Mechanical Properties of Fluids: JEE Main previous year questions

102 questions in 79 of the 108 JEE Main shifts Lumi analysed, asked in 7 of 8 years. Here is what this chapter tests and how.

Study this chapter
Questions
102
in 79 of 108 shifts · 7 of 8 years
Average a shift
0.8
of 25 Physics · 1.1 since 2024 +0.5
Typical range
0.3–1.1
questions a shift; fewest 0.0, most 1.2
Weighted estimate
1.0
model, recent years count more · about 3.8 marks
  • Typical range (fact)
  • Average a shift (fact)
  • Weighted estimate (model)

Questions are counted per shift, out of the 25 each subject has, in the shifts Lumi analysed; papers that offered 30 a subject (2017, 2021–2024) are scaled to 25. Typical range: the middle six of the eight years (2017, 2020–2026), leaving out the single highest and lowest year. The average and the range are historical fact. The weighted estimate is a model: each year's share, with recent years counting more (half-life three years), and chapters NTA dropped from the syllabus set near zero. It is a guide to effort, not a forecast of the paper.

What to do

How to spend time on Mechanical Properties of Fluids

Priority

Should do

One of the 10 Physics chapters that took Physics from half to 80% of its questions in the 108 shifts analysed. How bands are set

Past questions
102in 79 of 108 shifts
Study plan gives it
16 hover 12 months; 12 h over 6
Study this chapter →

Ideas asked most often

  1. Splitting and Coalescence10×
  2. Terminal Velocity Calculation7×
  3. Excess Pressure in Soap Bubbles6×
  4. Bernoulli's Equation5×
  5. Pascal's Law5×

165 of the 222 ideas in Lumi’s map of this chapter have not been asked or touched in the shifts analysed. Of its idea-tagged questions from 2024 on, 32% tested an idea not asked in an earlier year, so learn the whole chapter, not just the list above.

Within each subject, chapters in NTA's 2026 syllabus are ranked by their average questions a shift over all 8 years analysed (history, not the model). Going down that list, the chapters that together held the first half of the subject's questions are Must do; the next ones, up to 80%, are Should do; the rest are Lower priority.

Key findings

Mechanical Properties of Fluids at a glance

  1. 01

    68%

    of its 41 questions from 2024 on that Lumi matched to an idea tested one JEE Main had asked in an earlier year; 100% came from a topic asked in an earlier year.

  2. 02

    74%

    of the 222 ideas in Lumi's map of the chapter have not been asked or touched on in the shifts analysed.

  3. 03

    33%

    of its questions asked for a numerical answer, 1.1 times the Physics average.

  4. 04

    4%

    of its questions were rated hard, against 5% across all Physics questions in the same shifts.

Questions a shift, year by year

Out of the 25 Physics questions in a shift. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift.

0240’171.1’200.3’210.8’220.9’231.2’241’251.1’26

Raw count: 2017: 0 in 1 shift · 2020: 13 in 12 shifts · 2021: 10 in 24 shifts · 2022: 23 in 24 shifts · 2023: 13 in 12 shifts · 2024: 25 in 18 shifts · 2025: 8 in 8 shifts · 2026: 10 in 9 shifts.

Kind of question

SHARE OF QUESTIONS
  • Numerical answer33%
  • Calculation27%
  • Multi-step14%
  • Application8%
  • Two statements6%
  • Recall, single correct3%
  • Assertion–reason3%
  • Diagram based3%
  • Conceptual2%
  • Match the list1%
  • Data or graph1%

Most common asks: viscous force at terminal velocity (4); work done expanding soap bubble (3); viscosity from terminal velocity (3).

Profile

This chapter in numbers

Where it ranks, how steady it is, and what it costs to study.

Rank, all JEE chapters
#40
of 70 by weighted estimate
Rank in Physics
#10
of 28 chapters
Share of Physics
3.2%
of its questions, all shifts analysed
Busiest year
2024
1.2 questions a shift
Year to year
Swings a lot
varies by about 0.4 questions a shift
Long-run direction
+0.11
questions a shift, per year
Easy questions
36%
4% rated hard
Numerical answer
33%
1.1× the Physics rate
With a figure
12%
graph, diagram or structure
Study time
16 h
12 h on a 6-month plan
Marks per study hour
0.25
#24 of 70 chapters
Foundation for others
26%
of its ideas are used in other chapters

Difficulty, year by year

Each question rated easy, medium or hard. Each bar is that year’s split, so years compare directly; the number is the questions in that year’s analysed shifts (1 to 24 shifts a year).

  • 2017
  • 202013
  • 202110
  • 202223
  • 202313
  • 202425
  • 20258
  • 202610
  • Easy
  • Medium
  • Hard

What it asks you to do

SHARE OF QUESTIONS
  • Calculation58%
  • Multi-step19%
  • Conceptual10%
  • Application9%
  • Recall4%
  • Data or graph1%

Coverage

How much of the chapter JEE Main has used

We split the chapter into 222 ideas. In the 108 shifts analysed, JEE Main built a question around 50 of them. Most of the chapter has never been the main idea of a question, so past questions alone leave most of it out.

Asked as the main idea
50
Touched on in a question
7
Never asked
165

Topics

What repeats, topic by topic

This chapter's questions per topic in each year's analysed shifts. The number is the count; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. 6 questions had no close topic in Lumi's map and count for the chapter only.

’17’20’21’22’23’24’25’26
011+questions in that year’s analysed shifts, shaded per shift
  • Surface Tension

    As a topic: 36 questions in 7 of 8 years, most often single correct, 36% numerical answer.

  • Fluid Dynamics

    As a topic: 21 questions in 7 of 8 years, most often single correct, 38% numerical answer.

  • Viscosity

    As a topic: 26 questions in 6 of 8 years, most often single correct, 23% numerical answer.

  • Fluid Statics

    As a topic: 19 questions in 6 of 8 years, most often single correct, 26% numerical answer.

Drill down

Topic, idea, question

Open a topic to see every idea JEE Main tested inside it, then open an idea to read the questions. Each row shows its 8 years.

  • Open35 · 34%45621134

    17 ideas inside

    • OpenRepeated10 · 29%332
    • OpenRepeated6 · 17%3
    • OpenRepeated3 · 9%2
    • OpenRepeated2 · 6%
    • OpenRepeated2 · 6%
    • Open1 · 3%
    • Open1 · 3%
    • Open1 · 3%
    • Open1 · 3%
    • Open1 · 3%
    • Open1 · 3%
    • Open1 · 3%
    • Open1 · 3%
    • Open1 · 3%
    • Open1 · 3%
    • Open1 · 3%
    • Open1 · 3%
  • Open21 · 21%325343
  • Open21 · 21%9452
  • Open17 · 17%5244
  • Open2 · 2%

Squares are the 8 years with analysed shifts, 2017 to 2026. A number is the questions that year when there is more than one; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. Share is of the level above.

Ideas

The exact ideas JEE Main has asked

Inside the topics, 46 different ideas were tested; 19 came more than once. These are the repeats, then the ideas new since 2024.

Dots are the 8 years with analysed shifts, 2017 to 2026.

Every question

All 102 Mechanical Properties of Fluids questions

Newest first, shift by shift. The newest 40 show their opening words; older ones name the idea they tested. Each opens with its options and the official answer.

JEE Main 202610 questions

  1. 2 Apr 2026, Shift 1 · Q45A liquid drop of diameter 22 mm breaks into 512512 droplets. The change in surface energy is α×10−6\alpha\times10^{-6} J. The value of…EasySingle correct
  2. 2 Apr 2026, Shift 1 · Q50A tub is filled with water and a wooden cube 10 cm×10 cm×10 cm10\ \mathrm{cm}\times10\ \mathrm{cm}\times10\ \mathrm{cm} is placed in the water. The…EasyNumerical value
  3. 2 Apr 2026, Shift 2 · Q33The surface tension of a soap bubble is 0.03 N/m. The work done in increasing the diameter of bubble from 2 cm to 6 cm is…EasySingle correct
  4. 2 Apr 2026, Shift 2 · Q35If an air bubble of diameter 2 mm rises steadily through a liquid of density 2000 kg/m3^3 at a rate of 0.5 cm/s, then the coefficient of…MediumSingle correct
  5. 4 Apr 2026, Shift 1 · Q47The surface tension of a soap solution is 3.5×10−23.5\times10^{-2} N/m. The work required to increase the radius of a soap bubble from 11 cm to…MediumNumerical value
  6. 4 Apr 2026, Shift 2 · Q32A water spray gun is attached to a hose of cross sectional area 30 cm230\ \mathrm{cm^2}. The gun comprises of 10 perforations each of cross…EasySingle correct
  7. 5 Apr 2026, Shift 2 · Q33Eight mercury drops, each of radius rr, coalesce to form a bigger drop. The surface energy released in this process is __________. (S is…EasySingle correct
  8. 6 Apr 2026, Shift 2 · Q34A cylindrical vessel of 40 cm radius is completely filled with water and its capacity is 528 dm3^3 (dm : decimeter) The vessel is placed…MediumSingle correct
  9. 8 Apr 2026, Shift 2 · Q33A liquid of density 600 kg/m3^3 flowing steadily in a tube of varying cross-section. The cross-section at a point AA is 1.0 cm2^2 and…EasySingle correct
  10. 8 Apr 2026, Shift 2 · Q34A spherical liquid drop of radius RR acquires the terminal velocity v1v_1 when falls through a gas of viscosity η\eta. Now the drop is…MediumSingle correct

JEE Main 20258 questions

  1. 2 Apr 2025, Shift 1 · Q47A vessel with square cross-section and height of 6 m is vertically partitioned. A small window of 100 cm2100\ \mathrm{cm}^2 with hinged door is…MediumNumerical value
  2. 2 Apr 2025, Shift 2 · Q31Two water drops each of radius rr coalesce to form a bigger drop. If TT is the surface tension, the surface energy released in this…EasySingle correct
  3. 3 Apr 2025, Shift 1 · Q32Consider a completely full cylindrical water tank of height 1.6 m and of cross-sectional area 0.5 m20.5\ \mathrm{m^2}. It has a small hole in…MediumSingle correct
  4. 3 Apr 2025, Shift 2 · Q30Two cylindrical vessels of equal cross sectional area of 2 m22\,\mathrm{m^2} contain water upto heights 10m and 6m, respectively. If the…MediumSingle correct
  5. 3 Apr 2025, Shift 2 · Q32A solid steel ball of diameter 3.6 mm acquired terminal velocity 2.45×10−22.45 \times 10^{-2} m/s while falling under gravity through an oil of…EasySingle correct
  6. 3 Apr 2025, Shift 2 · Q47The excess pressure inside a soap bubble A in air is half the excess pressure inside another soap bubble B in air. If the volume of the…EasyNumerical value
  7. 7 Apr 2025, Shift 2 · Q32A capillary tube of radius 0.1 mm is partly dipped in water (surface tension 70 dyn/cm and glass water contact angle ≈0∘\approx 0^\circ)…MediumSingle correct
  8. 8 Apr 2025, Shift 2 · Q48A sample of a liquid is kept at 1 atm. It is compressed to 5 atm which leads to change of volume of 0.8 cm3^3. If the bulk modulus of the…EasyNumerical value

JEE Main 202425 questions

  1. 4 Apr 2024, Shift 1 · Q37Given below are two statements : Statement I : When speed of liquid is zero everywhere, pressure difference at any two points depends on…MediumTwo statementsHas a figure
  2. 4 Apr 2024, Shift 1 · Q53A soap bubble is blown to a diameter of 7 cm. 36960 erg of work is done in blowing it further. If surface tension of soap solution is 40…MediumNumerical value
  3. 4 Apr 2024, Shift 2 · Q38Given below are two statements : Statement I : The contact angle between a solid and a liquid is a property of the material of the solid…MediumTwo statements
  4. 4 Apr 2024, Shift 2 · Q57Mercury is filled in a tube of radius 2 cmcm up to a height of 30 cmcm. The force exerted by mercury on the bottom of the tube is ______…MediumNumerical value
  5. 5 Apr 2024, Shift 1 · Q37Given below are two statements : Statement I : When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the…MediumTwo statements
  6. 5 Apr 2024, Shift 2 · Q54A hydraulic press containing water has two arms with diameters as mentioned in the figure. A force of 10 N is applied on the surface of…EasyNumerical valueHas a figure
  7. 6 Apr 2024, Shift 1 · Q35A small ball of mass m and density ρ\rho is dropped in a viscous liquid of density ρ0\rho_0. After sometime, the ball falls with constant…MediumSingle correct
  8. 6 Apr 2024, Shift 1 · Q54A big drop is formed by coalescing 1000 small droplets of water. The ratio of surface energy of 1000 droplets to that of energy of big…EasyNumerical value
  9. 6 Apr 2024, Shift 2 · Q38Pressure inside a soap bubble is greater than the pressure outside by an amount : (given : RR = Radius of bubble, SS = Surface tension…EasySingle correct
  10. 8 Apr 2024, Shift 1 · Q36Correct Bernoulli's equation is (symbols have their usual meaning) :EasySingle correct
  11. 8 Apr 2024, Shift 1 · Q53A liquid column of height 0.04 cm balances excess pressure of a soap bubble of certain radius. If density of liquid is…MediumNumerical value
  12. 8 Apr 2024, Shift 2 · Q37A cube of ice floats partly in water and partly in kerosene oil. The ratio of volume of ice immersed in water to that in kerosene oil…MediumDiagram basedHas a figure
  13. 8 Apr 2024, Shift 2 · Q53Small water droplets of radius 0.01 mm are formed in the upper atmosphere and falling with a terminal velocity of 10 cm/s. Due to…MediumNumerical value
  14. 9 Apr 2024, Shift 1 · Q37A sphere of relative density σ\sigma and diameter D has concentric cavity of diameter d. The ratio of Dd\frac{D}{d}, if it just floats on…MediumSingle correct
  15. 9 Apr 2024, Shift 2 · Q39The excess pressure inside a soap bubble is thrice the excess pressure inside a second soap bubble. The ratio between the volume of the…EasySingle correct
  16. 9 Apr 2024, Shift 2 · Q40A spherical ball of radius 1×10−41\times10^{-4} m and density 105 kg/m310^5\ \mathrm{kg/m^3} falls freely under gravity through a distance hh before…HardSingle correct
  17. 1 Feb 2024, Shift 1 · Q53A plane is in level flight at constant speed and each of its two wings has an area of 40 m2^2. If the speed of the air is 180 km/h over…MediumNumerical value
  18. 1 Feb 2024, Shift 2 · Q37A big drop is formed by coalescing 1000 small droplets of water. The surface energy will become :EasySingle correct
  19. 27 Jan 2024, Shift 1 · Q37Given below are two statements : Statement (I) : Viscosity of gases is greater than that of liquids. Statement (II) : Surface tension of a…MediumTwo statements
  20. 29 Jan 2024, Shift 1 · Q37Given below are two statements: Statement I : If a capillary tube is immersed first in cold water and then in hot water, the height of…EasyTwo statements
  21. 29 Jan 2024, Shift 1 · Q53In a test experiment on a model aeroplane in wind tunnel, the flow speeds on the upper and lower surfaces of the wings are…EasyNumerical value
  22. 30 Jan 2024, Shift 1 · Q31Match List - I with List - II. List - I List - II (A) Coefficient of viscosity (I) [M L2 T−2][\mathrm{M\,L^2\,T^{-2}}] (B) Surface tension (II)…EasyMatch the list
  23. 30 Jan 2024, Shift 2 · Q53Splitting and Coalescence · Easy · Numerical value
  24. 31 Jan 2024, Shift 1 · Q37Velocity-Time Graph of Terminal Velocity · Easy · Single correct · has a figure
  25. 31 Jan 2024, Shift 2 · Q37Radius Dependence of Terminal Velocity · Medium · Single correct

JEE Main 202313 questions

  1. 6 Apr 2023, Shift 1 · Q33Terminal Velocity Calculation · Easy · Single correct
  2. 6 Apr 2023, Shift 2 · Q37Pascal's Law · Easy · Assertion–reason
  3. 8 Apr 2023, Shift 1 · Q32Hydrostatic Pressure · Medium · Single correct
  4. 8 Apr 2023, Shift 1 · Q52Terminal Velocity of Rising Bubbles · Medium · Numerical value
  5. 8 Apr 2023, Shift 2 · Q35Pascal's Law · Easy · Single correct
  6. 10 Apr 2023, Shift 1 · Q36Pascal's Law · Easy · Two statements
  7. 10 Apr 2023, Shift 2 · Q52Equation of Continuity · Easy · Numerical value · has a figure
  8. 11 Apr 2023, Shift 2 · Q36Terminal Velocity of Coalescing Drops · Medium · Single correct
  9. 11 Apr 2023, Shift 2 · Q52Surface Energy and Work · Medium · Numerical value
  10. 12 Apr 2023, Shift 1 · Q54Venturi Meter Principles · Medium · Numerical value
  11. 13 Apr 2023, Shift 1 · Q37Bernoulli's Equation · Medium · Single correct · has a figure
  12. 13 Apr 2023, Shift 2 · Q36Terminal Velocity Radius Proportionality · Medium · Assertion–reason
  13. 15 Apr 2023, Shift 1 · Q52Excess Pressure in Submerged Air Bubbles · Medium · Numerical value

JEE Main 202223 questions

  1. 25 Jul 2022, Shift 2 · Q33Open the question · Hard · Single correct
  2. 26 Jul 2022, Shift 1 · Q45Splitting and Coalescence · Medium · Single correct
  3. 27 Jul 2022, Shift 1 · Q35Open the question · Medium · Single correct
  4. 27 Jul 2022, Shift 2 · Q58Excess Pressure in Soap Bubbles · Medium · Numerical value
  5. 28 Jul 2022, Shift 1 · Q58Terminal Velocity of Rising Bubbles · Medium · Numerical value
  6. 28 Jul 2022, Shift 2 · Q3Force Exerted by a Fluid Jet · Easy · Single correct
  7. 28 Jul 2022, Shift 2 · Q7Torricelli's Law of Efflux · Medium · Single correct · has a figure
  8. 29 Jul 2022, Shift 1 · Q37Angle of Contact · Easy · Assertion–reason
  9. 29 Jul 2022, Shift 2 · Q54Terminal Velocity Calculation · Medium · Numerical value
  10. 30 Jul 2022, Shift 2 · Q1Open the question · Medium · Single correct
  11. 30 Jul 2022, Shift 2 · Q27Splitting and Coalescence · Medium · Numerical value
  12. 25 Jun 2022, Shift 1 · Q36Radius Dependence of Terminal Velocity · Easy · Single correct
  13. 25 Jun 2022, Shift 1 · Q53Newton's Law of Viscosity · Medium · Numerical value
  14. 26 Jun 2022, Shift 1 · Q60Bernoulli's Equation · Medium · Numerical value · has a figure
  15. 26 Jun 2022, Shift 2 · Q36Reynolds Number · Easy · Single correct
  16. 27 Jun 2022, Shift 1 · Q39Terminal Velocity Calculation · Medium · Single correct
  17. 27 Jun 2022, Shift 1 · Q59Torricelli's Law of Efflux · Medium · Numerical value
  18. 28 Jun 2022, Shift 1 · Q36Splitting and Coalescence · Medium · Single correct
  19. 28 Jun 2022, Shift 2 · Q37Terminal Velocity Calculation · Medium · Single correct
  20. 28 Jun 2022, Shift 2 · Q58Venturi Meter Principles · Medium · Numerical value
  21. 29 Jun 2022, Shift 2 · Q52Terminal Velocity Calculation · Medium · Numerical value
  22. 30 Jun 2022, Shift 1 · Q35Terminal Velocity of Rising Bubbles · Medium · Single correct
  23. 30 Jun 2022, Shift 1 · Q54Excess Pressure in Drops · Easy · Numerical value

JEE Main 202110 questions

  1. 4 Aug 2021, Shift 1 · Q2Apparent Weight in Fluids · Easy · Single correct
  2. 26 Aug 2021, Shift 1 · Q6Capillary Difference in a U-Tube · Easy · Single correct
  3. 26 Aug 2021, Shift 1 · Q23Pressure in Concentric Soap Bubbles · Medium · Numerical value
  4. 31 Aug 2021, Shift 1 · Q25Compressibility and Density Changes · Medium · Numerical value
  5. 24 Feb 2021, Shift 1 · Q24Pascal's Law · Easy · Numerical value
  6. 26 Feb 2021, Shift 1 · Q6Splitting and Coalescence · Medium · Single correct
  7. 25 Jul 2021, Shift 2 · Q8Isothermal Coalescence of Bubbles · Medium · Single correct
  8. 16 Mar 2021, Shift 2 · Q8Reynolds Number and Flow Regime · Medium · Single correct
  9. 17 Mar 2021, Shift 1 · Q9Common Interface of Coalescing Bubbles · Medium · Single correct
  10. 18 Mar 2021, Shift 2 · Q28Torricelli's Law of Efflux · Medium · Numerical value · has a figure

JEE Main 202013 questions

  1. 8 Jan 2020, Shift 1 · Q6Law of Floatation · Hard · Single correct
  2. 8 Jan 2020, Shift 1 · Q7Temperature Effects on Buoyancy · Medium · Single correct
  3. 8 Jan 2020, Shift 2 · Q6Force on Vertical Walls · Medium · Diagram based · has a figure
  4. 9 Jan 2020, Shift 1 · Q6Venturi Meter Principles · Medium · Single correct · has a figure
  5. 9 Jan 2020, Shift 2 · Q9Surface Tension Force on a Floating Sphere · Medium · Single correct
  6. 2 Sep 2020, Shift 1 · Q8Surface Profile of a Rotating Fluid · Medium · Diagram based · has a figure
  7. 2 Sep 2020, Shift 2 · Q7Capillary Rise (Ascent Formula) · Medium · Single correct
  8. 3 Sep 2020, Shift 1 · Q6Excess Pressure in Soap Bubbles · Easy · Single correct
  9. 3 Sep 2020, Shift 1 · Q25Capillary Rise (Ascent Formula) · Easy · Numerical value
  10. 4 Sep 2020, Shift 1 · Q6Archimedes' Principle · Medium · Single correct
  11. 4 Sep 2020, Shift 2 · Q8Open the question · Hard · Single correct
  12. 5 Sep 2020, Shift 1 · Q7Law of Floatation · Medium · Single correct
  13. 6 Sep 2020, Shift 2 · Q7Bernoulli's Equation · Easy · Single correct

Questions from the official JEE Main papers published by NTA. Chapter, topic and idea tags, counts and notes are Lumi’s. Pattern: Asked most years.

More Physics, Class 11

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