Fluid Mechanics PYQs - Last 10 Years

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Practice 21 COMEDK Physics questions from Fluid Mechanics. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.

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Last 10 Years Fluid Mechanics Questions

Showing 21 of 21 filtered questions.

1Fluid Mechanics

A small hollow vessel which has a small circular hole of radius $r$ in its base, is immersed in a tank of oil of density $\rho$ and surface tension $T$. The oil will penetrate into the vessel at a depth of

2Fluid Mechanics

Calculate the vapour pressure that can help the formation of a spherical droplet of water of radius $6.25 \times 10^{-5} \mathrm{~m}$ at $22^{\circ} \mathrm{C}$. Given: The surface tension of water at the given temperature is $7.28 \times 1...

3Fluid Mechanics

A cylindrical tank 0.5 m in radius, rests on a platform 1.5 m high. Initially the tank is filled with water to a height of 2.5 m . A small plug whose area is $10^{-4} \mathrm{~m}^2$ is removed from an orifice located on the side of the tank...

4Fluid Mechanics

In to a vessel containing pure water a clean glass tube of radius $3.6 \times 10^{-4} \mathrm{~m}$ is held vertically with 12 cm of the tube above the water level. Now the capillary tube is moved down in to the water so that only 2 cm of it...

5Fluid Mechanics

A wind mill converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. The electrical power output P is related to the velocity of wind v as

6Fluid Mechanics

Water from a tap emerges vertically downwards with an initial speed of $1.0 \mathrm{~ms}^{-1}$. The cross-sectional area of the tap is $1 \mathrm{~cm}^2$. Assume that the pressure is constant throughout the stream of water and that the flow...

7Fluid Mechanics

64 rain drops of the same radius are falling through air with a steady velocity of \(0.5 \mathrm{~cm} \mathrm{~s}^{-1}\). If the drops coalesce, the terminal velocity would be

8Fluid Mechanics

What is the relation obeyed by the angles of contact \(\theta_1, \theta_2\) and \(\theta_3\) of 3 liquids of different densities \(P_1, P_2\) and \(P_3\) respectively \((\mathrm{P}_1 < \mathrm{P}_2 < \mathrm{P}_3\)) when they rise to the sa...

9Fluid Mechanics

Modulus of rigidity of an incompressible liquid is

10Fluid Mechanics

Water flows from a tap with steady flow, through a cross sectional area of \(10^{-3} \mathrm{~m}^2\) with a speed of \(0.5 \mathrm{~ms}^{-1}\). Assume the pressure is constant throughout the stream of water. The cross sectional area of the ...

11Fluid Mechanics

Water from a tap of cross-sectional area \(1 \mathrm{~cm}^2\), falls vertically downwards at \(2 \mathrm{~m} / \mathrm{s}\). The cross sectional area of the stream, \(20 \mathrm{~cm}\) below the tap is (assume that pressure is constant thro...

12Fluid Mechanics

The speeds of air-flow on the upper and lower surfaces of a wing of an aeroplane are \(v_1\) and \(v_2\), respectively. If \(A\) is the cross-sectional area of the wing and \(\rho\) is the density of air, then the upward lift is

13Fluid Mechanics

A balloon with mass $m$ is descending down with an acceleration \(a\) (where, \(a < g\) ). How much mass should be removed from it so that it starts moving up with an acceleration \(a\) ?

14Fluid Mechanics

A block of wood floats in water with \((4 / 5)\) th of its volume submerged. If the same block just floats in a liquid, the density of the liquid is (in \(\mathrm{kgm}^{-3}\))

15Fluid Mechanics

Water is poured in a tank through a cylindrical tube of area of cross-section A and ejecting water at a constant speed 4 m/s. the tank contains a hole of area \(\frac{A}{2}\) at bottom. Level of water in the tank will not go up beyond

16Fluid Mechanics

A raft of density 600 g/m\(^3\) and mass 120 kg floats in water. How much weight can be put on the raft to make it just sink?

17Fluid Mechanics

The surface tension of a liquid at its boiling point

18Fluid Mechanics

According to Pascal's law, pressure in a fluid at rest is the same at all points, if

19Fluid Mechanics

A fluid is in streamline flow across a horizontal
pipe of variable area of cross-section. For this
which of the following statements is correct?

20Fluid Mechanics

A frame made of metallic wire enclosing a surface area A is covered with a soap film. If the area of the frame of metallic wire is reduced by 50%, then the energy of the soap film will be changed by

21Fluid Mechanics

A ball floats on the surface of water in a
container exposed to the atmosphere. When the
container is covered and the air is partially
removed, then the ball