List of top Physics Questions on Hydrostatics

What is the work done to stretch a string?
What is the speed of water flowing through a hole located at a depth \(h\) from the surface of water in a tank?
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?
An ideal fluid of density 800kgm–3, flows smoothly through a bent pipe (as shown in figure) that tapers in cross-sectional area from a to \(\frac{a}{2}\). The pressure difference between the wide and narrow sections of pipe is 4100 Pa. At wider section, the velocity of fluid is\(\frac{\sqrt{x}}{6}\) ms1 for x=_______. (Given g=10 ms-2)
ideal fluid of density 800kgm–3
An open-ended U-tube of uniform cross-sectional area contains water 
\((density\) \(10^{3} \,kg\, m ^{-3} )\). Initially the water level stands at \(0.29 \,m\) from the bottom in each arm Kerosene oil (a water-immiscible liquid) of density \(800 \,kg\, m ^{-3}\) is added to the left arm until its length is \(0.1 \,m\), as shown in the schematic figure below .The ratio \(\left(\frac{ h _{1}}{ h _{2}}\right)\) of the heights of the liquid in the two arms is
Tube

A square gate of size 1m × 1m is hinged at its mid-point. A fluid of density ρ fills the space to the left of the gate. The force F required to hold the gate stationary is 

Find pressure on swimmer at a depth of 10 m in water
A layer of oil with density $724\, kg/m^3$ floats on water of density $1000\, kg/m^3$. A block floats at the oil-water interface with $1/6$ of its volume in oil and $5/6$ of its volume in water, as shown in the figure. What is the density of the block?
An incompressible non viscous fluid flows steadily through a cylindrical pipe which has radius $2R$ at point $A$ and radius $R$ at point $B$ farther along the flow direction. If the velocity of the fluid at point $A$ is $V$, its velocity at the point $B$ will be

A square gate of size \(1\,\text{m} \times 1\,\text{m}\) is hinged at its mid-point. A fluid of density \(\rho\) fills the space to the left of the gate. The force \(F\) required to hold the gate stationary is: 

A ball whose density is \( 0.4 \times 10^3 \, \text{kg/m}^3 \) falls into water from a height of 9 cm. To what depth does the ball sink?
An ice block floats in a liquid whose density is less than water. A part of block is outside the liquid. When whole of ice has melted, the liquid level will:
An air bubble of volume v₀ is released by a fish at depth h in a lake. The volume of bubble just before reaching the surface will be:
A long cylindrical glass vessel has a pinhole of diameter $0.2\, mm$ at its bottom. The depth to which the vessel can be lowered vertically in a deep water bath without the water entering into the vessel is (surface tension of water, $T=0.07 \,Nm ^{-1}$, acceleration due to gravity, $g=10 \,ms ^{-2}$ )
A common hydrometer reads specific gravity of liquids. Compared to the 1.6 mark of the stem the mark 1.5 will be
An ideal fluid flows through a pipe of circular cross-section made of two sections with diameters $2.5\, cm$ and $3.75\, cm$. The ratio of the velocities in the two pipes is