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9A cube with a mass $' m'$ completely wettable by water floats on the surface of water. Each side of the cube is $' a' .$ What is the distance h between the lower face of cube and the surface of the water if surface tension is $S .$ Take density of water as $ρ_{w} .$ Take angle of contact is zero.

Important Questions on Fluid Mechanics

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Beta Question Bank for Engineering: Physics>Chapter 13 - Fluid Mechanics>Exercise-1>Q 1

A crown made of gold and copper weights

210 g

in air and

198 g

in water. The weight of gold in crown is:[Given : Density of gold

= 19.3 g {cm}^{- 3}

and Density of copper

= 8.5 g {cm}^{- 3}]

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Beta Question Bank for Engineering: Physics>Chapter 13 - Fluid Mechanics>Exercise-1>Q 2

To what height

h

should a cylindrical vessel of diameter

d

be filled with a liquid so that the liquid force on the vertical surface of the vessel be equal to the force on the bottom?

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Beta Question Bank for Engineering: Physics>Chapter 13 - Fluid Mechanics>Exercise-1>Q 3

Two vessels $A$ and $B$ have the same base area and contain water to the same height, but the mass of water in $A$ is four times that in $B .$ The ratio of the liquid thrust at the base of $A$ to that at the base of $B$ is :-

Question Image

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Beta Question Bank for Engineering: Physics>Chapter 13 - Fluid Mechanics>Exercise-1>Q 4

Water stands upto a height

h

behind the vertical wall of a dam. What is the net horizontal force pushing the dam down by the stream, if width of the dam is

σ ? (ρ =

density of water) :-

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Beta Question Bank for Engineering: Physics>Chapter 13 - Fluid Mechanics>Exercise-1>Q 5

A U-tube is partially filled with water. Oil which does not mix with water is next poured into one side, until water rises by

25 cm

on the other side. If the density of the oil is

0.8 g {cc}^{- 1}

, the oil level will stand higher than the water level by:-

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Beta Question Bank for Engineering: Physics>Chapter 13 - Fluid Mechanics>Exercise-1>Q 6

The side wall of glass aquarium is

1 m

high and

2 m

long. When the aquarium is filled to the top with water. what is the net force against the side-

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Beta Question Bank for Engineering: Physics>Chapter 13 - Fluid Mechanics>Exercise-1>Q 7

The gauge pressure of

3 \times 10^{5} N m^{- 2}

must be maintained in the main water pipes of a city. How much work must be done to pump

50, 000 m^{3}

of water at a pressure of

1.0 \times 10^{5} N m^{- 2} -

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Beta Question Bank for Engineering: Physics>Chapter 13 - Fluid Mechanics>Exercise-1>Q 8

The barometric pressure and height on the earth are

10^{5} Pa

and

760 mm

respectively. If it is taken to moon, then barometric height will be :-

9A cube with a mass 'm' completely wettable by water floats on the surface of water. Each side of the cube is 'a'. What is the distance h between the lower face of cube and the surface of the water if surface tension is S. Take density of water as ρw. Take angle of contact is zero.

Important Questions on Fluid Mechanics

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9A cube with a mass $' m'$ completely wettable by water floats on the surface of water. Each side of the cube is $' a' .$ What is the distance h between the lower face of cube and the surface of the water if surface tension is $S .$ Take density of water as $ρ_{w} .$ Take angle of contact is zero.