Fluid Mechanics: JEE Main Physics Previous Year Questions

289 previous year questions from Fluid Mechanics. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. $The gauge pressure at a depth of 50 m in a sea is (Density of sea water is 1025 kg m^{- 3} and g = 10 ms^{- 2})$
2. $A small sphere of radius r falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere atta\dots$
3. $An ideal fluid flows (laminar flow) through a pipe of non-uniform diameter. The maximum and minimum diameters of the pipes are 6.4 cm and 4.8 cm, respec\dots$
4. $The area of cross-section of a railway track is 0. 01 m^{2} . The temperature variation is 1 0^{0} C. Coefficient of linear expansion of material of track is\dots$
5. $A stone of mass 20g is projected from a rubber catapult of length 0.1m and area of cross section 1 0^{- 6} m^{2} stretched by an amount 0.04m. The velocity of the project\dots$
6. $What is the terminal velocity of a rain drop of radius 0.02 mm ? [Note that the coefficient of viscosity of air is 1.8 \times \dots$
7. $If 1000 droplets of water of surface tension 0.07 N/m. having same radius 1 mm each, combine to from a single drop. In the process the released surface energy is- (Take\dots$
8. $An air bubble of diameter 6 mm rises steadily through a solution of density 1750 kg m^{- 3} at the rate of 0. 35 cm s^{- 1} . The co-efficient of viscosity of the soluti\dots$
9. $The value of tension in a long thin metal wire has been changed from T1 to T_{2} . The lengths of the metal wire at two different values of tension T1 and T1 are\dots$
10. $A small liquid drop of radius R is divided into 27 identical liquid drops. If the surface tension is T, then the work done in the process will be:$
11. $A sphere of relative density σ and diameter D has concentric cavity of diameter d . The ratio of \frac{D}{d}, if it just floats on water in a tank is:$
12. $64 identical drops each charged upto potential of 10 mV are combined to form a bigger drop. The potential of the bigger drop will be_____mV.$
13. $A tank of oil has height of 4 m and density of 850 kg m^{- 3} . The gauge pressure at the bottom of the tank is\dots$
14. $A small hole of area of cross-section 2 mm^{2} is present near the bottom of a fully filled open tank of height 2 m. Taking g = 10 m / s^{2}, the\dots$
15. $A 400 g solid cube having an edge of length 10 cm floats in water. How much volume of the cube is outside the water? (Given: density of water\dots$
16. $A plane is in level flight at constant speed and each of its two wings has an area of 40 m^{2} . If the speed of the air is 180 km / h over the lower wing surfa\dots$
17. $A bullet of mass 5 g, travelling with a speed of 210 m / s, strikes a fixed wooden target. One half of its kinetic energy is converted into heat in the bullet while the\dots$
18. $A spherical body of radius r and density σ falls freely through a viscous liquid having density ρ and viscosity η and attains a terminal velocit\dots$
19. $The pressure at the bottom of a liquid tank is not proportional to the$
20. $A meniscus drop of radius 1 cm is sprayed into 10^{6} droplets of equal size. Calculate the energy expended if surface tension of mercury is\dots$
21. $A soap bubble of surface tension 0.04 N / m is blown to a diameter of 7 cm . If (15000 - x) μJ of work is done in blowing it further to make i\dots$
22. $Three liquids of densities ρ_{1}, ρ_{2} and ρ_{3} (with ρ_{1} > ρ_{2} > ρ_{3}), having the same value of surface tension T, rise to the same height in three i\dots$
23. $The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r . If the speed of the liquid in the tube is v, the speed\dots$
24. $The surface of water in a water tank of cross section area 750 c m^{2} on the top of a house is h m. above the tap level. The speed of water coming out through the tap o\dots$
25. $A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 N / m, then the excess force required to\dots$

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Fluid Mechanics: JEE Main Physics Previous Year Questions

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