JEE Main · Physics · Mechanical Properties of Fluids

Fluid Dynamics: JEE Main previous year questions

Name: Fluid Dynamics: JEE Main previous year questions
Creator: Lumi

21 questions in the 108 JEE Main shifts Lumi analysed, in 7 of 8 years. Pattern: Asked most years. 8 came in 2024–26. Here is how it is asked and which ideas come back.

Questions: 21; in 20 of 108 shifts
Years asked: 7/8; last asked 2026
Chance in a shift: 19%; calibrated model, how we compute it
Weighted estimate: 0.2; model; history: 0.2 a shift on average, typically 0.1–0.3

Key findings

01
Asked in 7 of 8 years with analysed shifts and in 20 of 108 shifts: 21 questions, #139 of 196 topics.
02
52% of its questions since 2020 tested an idea no earlier year had asked; 6 repeated an idea from the year before.
03
The most repeated idea is Bernoulli's Equation, asked 5 times in 5 shifts (2020, 2022, 2023, 2024, 2026), most often as “pressure difference in varying tube”.
04
JEE Main has asked 10 of the 57 ideas in this topic; 44 have never been asked, directly or inside another question.
05
Mostly asked as single correct (52%); 38% need a numerical answer, 33% are easy and 0% hard.
06
The skill tested most is calculation (62%), then multi-step (19%).

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.

Raw count: 2017: 0 in 1 shift · 2020: 3 in 12 shifts · 2021: 2 in 24 shifts · 2022: 5 in 24 shifts · 2023: 3 in 12 shifts · 2024: 4 in 18 shifts · 2025: 1 in 8 shifts · 2026: 3 in 9 shifts.

Up to 2023: 0.1; a shift, of 25
Since 2024: 0.2; 0.1
Usual gap: 1.0 yrs; between years asking it
Shifts with it: 20/108; 19% of analysed shifts

How it is asked

Difficulty, format and skill

Across all 21 questions on Fluid Dynamics since 2017.

Difficulty

QUESTIONS

714

Easy7 · 33%
Medium14 · 67%
Hard0 · 0%

Format

Single correct · 11 Q52%
Numerical value · 8 Q38%
Diagram based · 1 Q5%
Two statements · 1 Q5%

Skill tested

Calculation · 13 Q62%
Multi-step · 4 Q19%
Application · 2 Q10%
Conceptual · 1 Q5%
Recall · 1 Q5%

Repeats

New idea, or one asked before?

Each column is a year. Blue questions tested an idea no earlier year had asked; navy ones went back to an idea from an earlier year. 2017 is the first year, so everything in it counts as new. Heights are question counts, and Lumi analysed 1 to 24 shifts a year, so compare the split inside a column rather than heights across years.

’17’20’21’22’23’24’25’26

Idea asked for the first time
Idea asked in an earlier year

Coverage of the topic

JEE Main has asked 10 of the 57 ideas in this topic. 44 have never been asked yet.

1044

Asked directly10 · 18%
Touched inside another question3 · 5%
Never asked44 · 77%

Ideas come from Lumi’s JEE syllabus map. A never-asked idea is not a safe skip: across all of JEE Main, 22% of questions since 2024 tested an idea no earlier year had asked.

Drill down

Idea, year, question

Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.

ideaAskedShareYears’17’20’21’22’23’24’25’26

OpenRepeated5 · 24%24%5/8
- 8 Apr ’26 S2 · Q33
  A liquid of density 600 kg/m $^3$ flowing steadily in a tube of varying cross-section. The cross-section at a point $A$ is 1.0 cm $^2$ and…
  easySingle correct
- 8 Apr ’24 S1 · Q36
  Correct Bernoulli's equation is (symbols have their usual meaning) :
  easySingle correctAsked the year before
- 13 Apr ’23 S1 · Q37
  The figure shows a liquid of given density flowing steadily in horizontal tube of varying cross - section. Cross sectional areas at A is…
  mediumSingle correctAsked the year before
- 26 Jun ’22 S1 · Q60
  An ideal fluid of density 800 $\mathrm{kgm^{-3}}$ , flows smoothly through a bent pipe (as shown in figure) that tapers in cross-sectional…
  mediumNumerical value
- 6 Sep ’20 S2 · Q7
  A fluid is flowing through a horizontal pipe of varying cross-section, with speed $v\,\mathrm{ms^{-1}}$ at a point where the pressure is P…
  easySingle correctNew idea
OpenRepeated4 · 19%19%4/8
OpenRepeated3 · 14%14%2/82
Open2 · 10%10%1/82
OpenRepeated2 · 10%10%2/8
Open1 · 5%5%1/8
Open1 · 5%5%1/8
Open1 · 5%5%1/8
Open1 · 5%5%1/8
Open1 · 5%5%1/8

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

Every idea inside this topic

10 different ideas were tested; 5 came more than once.

Bernoulli's Equation5×
pressure difference in varying tube
Single correct · 5 shifts · 1 numerical
Venturi Meter Principles4×
statement i/ii on fluid pressure and venturi tube
Numerical value · 4 shifts · 2 numerical
Torricelli's Law of Efflux3×
efflux speed with extra load pressure
Numerical value · 3 shifts · 2 numerical
Equation of Continuity2×
exit speed from continuity equation
Numerical value · 2 shifts · 1 numerical
Dynamic Lift and Magnus Effect2×
lift on wing from bernoulli
Numerical value · 2 shifts · 2 numerical
Efflux Jet Horizontal Range1×
horizontal range of water jet from hole
Single correct · 1 shift
Efflux from a Pressurized Tank1×
efflux speed with extra surface pressure
Single correct · 1 shift
Force Exerted by a Fluid Jet1×
force exerted by water jet on wall
Single correct · 1 shift
Reynolds Number and Flow Regime1×
nature of flow from reynolds number
Single correct · 1 shift
Surface Profile of a Rotating Fluid1×
height difference of liquid in rotating vessel
Diagram based · 1 shift

Idea	Times	Shifts	Format	Numerical
Bernoulli's Equationpressure difference in varying tube	5	5	Single correctCalculation	1
Venturi Meter Principlesstatement i/ii on fluid pressure and venturi tube	4	4	Numerical valueCalculation	2
Torricelli's Law of Effluxefflux speed with extra load pressure	3	3	Numerical valueCalculation	2
Equation of Continuityexit speed from continuity equation	2	2	Numerical valueCalculation	1
Dynamic Lift and Magnus Effectlift on wing from bernoulli	2	2	Numerical valueCalculation	2
Efflux Jet Horizontal Rangehorizontal range of water jet from hole	1	1	Single correctMulti-step	–
Efflux from a Pressurized Tankefflux speed with extra surface pressure	1	1	Single correctMulti-step	–
Force Exerted by a Fluid Jetforce exerted by water jet on wall	1	1	Single correctCalculation	–
Reynolds Number and Flow Regimenature of flow from reynolds number	1	1	Single correctApplication	–
Surface Profile of a Rotating Fluidheight difference of liquid in rotating vessel	1	1	Diagram basedCalculation	–

Times and shifts count every analysed shift. Across JEE Main, 78% of questions since 2024 went back to an idea an earlier year had asked; the rest were new. All repeated ideas

Every question

Fluid Dynamics questions, year by year

The opening words of each question as it appeared in the official paper, with the idea it tested. Open one for its options and the official answer.

Questions from the official JEE Main Paper 1 shifts published by NTA (CBSE for 2017). Questions NTA dropped are left out. Topic and idea tags, counts and notes are Lumi’s.

Key findings

Questions a shift, year by year

Difficulty, format and skill

Difficulty

Format

Skill tested

New idea, or one asked before?

Coverage of the topic

Idea, year, question

Every idea inside this topic

Fluid Dynamics questions, year by year

JEE Main 20263 questions in 3 shifts

JEE Main 20251 question in 1 shift

JEE Main 20244 questions in 4 shifts

JEE Main 20233 questions in 3 shifts

JEE Main 20225 questions in 4 shifts

JEE Main 20212 questions in 2 shifts

JEE Main 20203 questions in 3 shifts

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