Fluid Mechanics — JEE Main PYQs & Practice Questions

Fluid Mechanics is a Physics chapter in the JEE Main syllabus. This page brings together 95 previous-year and practice questions on Fluid Mechanics, organised into 5 topics: Pressure and Pascal's Law, Buoyancy and Archimedes' Principle, Equation of Continuity, Bernoulli's Theorem and Viscosity and Stoke's Law. Most questions come with a step-by-step solution you can work through free in PrepWiser.

Download Fluid Mechanics JEE Main PYQs as a free PDF (with answer key)

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Chapter weightage: how many questions each chapter had per shift in the 2024–26 papers.

Pressure and Pascal's Law

• In a hydraulic press, the ratio of output area to input area is 5. The mechanical…
• Given below are two statements : Statement I : Pressure of a fluid is exerted only on a…
• The hydrostatic pressure at a depth h in a fluid of density ρ (under gravity g) is:
• A vessel with square cross-section and height of 6 m is vertically partitioned. A small…
• The pressure acting on a submarine is 3 × 10⁵ Pa at a certain depth. If the depth is…
• In a hydraulic lift, the surface area of the input piston is 6 cm² and that of the…
• Two identical cylindrical vessels are kept on the ground and each contain the same…
• A hydraulic automobile lift is designed to lift vehicles of mass 5000 kg. The area of…
• Given below are two statements: one is labelled as Assertion A and the other is labelled…
• Given below are two statements: Statement I : Pressure in a reservoir of water is same…
• Two liquids of densities ρ ₁ an ρ ₂ (ρ ₂ = 2ρ ₁) are filled up behind a square wall of…
• A hydraulic press containing water has two arms with diameters as mentioned in the…
• Atmospheric pressure at sea level is approximately:
• A hydraulic press can lift 100 kg when a mass 'm' is placed on the smaller piston. It…
• Two cylindrical vessels of equal cross sectional area of 2 m² contain water upto heights…
• Mercury is filled in a tube of radius 2 cm up to a height of 30 cm. The force exerted by…
• An air bubble of volume 1 cm³ rises from the bottom of a lake 40 m deep to the surface…
• A cylindrical vessel containing a liquid is rotated about its axis so that the liquid…

Buoyancy and Archimedes' Principle

• A hollow spherical shell at outer radius R floats just submerged under the water…
• A balloon carries a total load of 185 kg at normal pressure and temperature of 27°C…
• A air bubble of radius 1 cm in water has an upward acceleration 9.8 cm s –2 . The…
• Consider a solid sphere of radius R and mass density ρ ( r ) = ρ ₀( 1 - r²/R² ) , 0 < r…
• A cube of ice floats partly in water and partly in kerosene oil. The ratio of volume of…
• A 400 g solid cube having an edge of length 10 cm floats in water. How much volume of…
• A cube having a side of 10 cm with unknown mass and 200 gm mass were hung at two ends of…
• A tub is filled with water and a wooden cube 10 cm× 10 cm× 10 cm is placed in the water…
• A sphere of relative density σ and diameter D has concentric cavity of diameter d. The…
• A cubical block of density ρ_b=600 kg/m³ floats in a liquid of density ρₑ=900kg/m³. If…

Equation of Continuity

• An ideal fluid flows (laminar flow) through a pipe of non-uniform diameter. The maximum…
• The surface of water in a water tank of cross section area 750 cm² on the top of a house…
• Figure below shows a liquid being pushed out of the tube by a piston having area of…
• A tube of length L is shown in the figure. The radius of cross section at the point (1)…
• A pressure-pump has a horizontal tube of cross sectional area 10 cm² for the outflow of…
• A water spray gun is attached to a hose of cross sectional area 30 cm². The gun…

Bernoulli's Theorem

• The area of cross-section of a large tank is 0.5 m². It has a narrow opening near the…
• Water flows in a horizontal pipe whose one end is closed with a valve. The reading of…
• A liquid of density 600 kg/m³ flowing steadily in a tube of varying cross-section. The…
• In a horizontal pipe, the static pressure decreases where the fluid velocity increases.
• An ideal fluid of density 800 kgm⁻³, flows smoothly through a bent pipe (as shown in…
• A fluid is flowing through a horizontal pipe of varying cross-section, with speed v ms…
• Water flows in a horizontal tube (see figure). The pressure of water changes by 700 Nm…
• A light cylindrical vessel is kept on a horizontal surface. Area of base is A. A hole of…
• A liquid of density 750 kgm⁻³ flows smoothly through a horizontal pipe that tapers in…
• In a test experiment on a model aeroplane in wind tunnel, the flow speeds on the upper…
• Consider a cylindrical tank of radius 1 m is filled with water. The top surface of water…
• A plane is in level flight at constant speed and each of its two wings has an area of 40…
• Bernoulli's theorem applies to:
• Consider a completely full cylindrical water tank of height 1.6 m and of cross-sectional…
• A fully loaded boeing aircraft has a mass of 5.4×10⁵ kg. Its total wing area is 500 m²…
• A cylindrical vessel of 40 cm radius is completely filled with water and its capacity is…
• Glycerin of density 1.25 × 10³ kg m⁻³ is flowing through the conical section of pipe The…
• Given below are two statements : Statement I : When speed of liquid is zero everywhere…
• Consider a water tank as shown in the figure. It's cross-sectional area is 0.4 m². The…
• Correct Bernoulli's equation is (symbols have their usual meaning) :

Viscosity and Stoke's Law

• A water drop of radius 1 μm falls in a situation where the effect of buoyant force is…
• A small ball of mass m and density ρ is dropped in a viscous liquid of density ρ₀. After…
• A spherical ball of radius 1 × 10⁻⁴ m and density 10⁵ kg / m³ falls freely under gravity…
• A small ball of mass M and density ρ is dropped in a viscous liquid of density ρ₀. After…
• A Spherical ball of radius 1mm and density 10.5 g/cc is dropped in glycerine of…
• The terminal velocity (vₜ) of the spherical rain drop depends on the radius (r) of the…
• A spherical liquid drop of radius R acquires the terminal velocity v₁ when falls through…
• The velocity of a small ball of mass 'm' and density d₁, when dropped in a container…
• A ball of radius r and density ρ dropped through a viscous liquid of density σ and…
• A small steel ball is dropped into a long cylinder containing glycerine. Which one of…
• The velocity of a small ball of mass 0.3 g and density 8 g / cc when dropped in a…
• An air bubble of negligible weight having radius r rises steadily through a solution of…
• If an air bubble of diameter 2 mm rises steadily through a liquid of density 2000 kg/m³…
• A small spherical ball of radius r, falling through a viscous medium of negligible…
• A solid steel ball of diameter 3.6 mm acquired terminal velocity 2.45 × 10⁻² m / s while…
• In an experiment to verify Stokes law, a small spherical ball of radius r and density ρ…
• According to Stokes' law, the viscous drag on a sphere of radius r moving with velocity…
• Sixty four rain drops of radius 1 mm each falling down with a terminal velocity of 10…
• In Millikan's oil drop experiment, what is viscous force acting on an uncharged drop of…
• The terminal velocity of a sphere falling in a viscous fluid depends on:

More Physics chapters

• Basic Mathematics for Physics
• Units, Dimensions & Errors
• Rectilinear Motion
• Vectors
• Projectile Motion & Relative Motion
• Newton's Laws of Motion
• Friction
• Circular Motion
• Work, Energy & Power
• Centre of Mass & Linear Momentum
• Collision
• Rotational Motion
• Gravitation
• Simple Harmonic Motion
• Elasticity
• Surface Tension
• Thermometry & Calorimetry
• Kinetic Theory of Gases
• Thermodynamics
• Heat Transfer
• Mechanical Waves
• Sound Waves
• Experimental Skills
• Electrostatics I — Charges, Field & Gauss's Law
• Electrostatics II — Potential & Capacitance
• Current Electricity
• Moving Charges & Magnetism
• Magnetism & Matter
• Electromagnetic Induction
• Alternating Current
• Electromagnetic Waves
• Ray Optics
• Wave Optics
• Dual Nature of Radiation & Matter
• Atomic Physics
• Nuclear Physics
• Semiconductors & Electronic Devices
• Communication Systems

Frequently asked questions

How many Fluid Mechanics questions are there for JEE Main?

PrepWiser has 95 Fluid Mechanics questions for JEE Main, grouped into 5 topics such as Pressure and Pascal's Law, Buoyancy and Archimedes' Principle and Equation of Continuity.

Are these Fluid Mechanics questions from previous-year JEE Main papers?

Yes — most are genuine previous-year questions from past JEE Main papers, and the rest are practice questions written to match the JEE Main pattern and difficulty.

Where can I see the answers and solutions to these Fluid Mechanics questions?

Open any Fluid Mechanics question in PrepWiser (it is free) to attempt it; most come with a step-by-step solution.