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A wind with speed $40 m / s$ blows parallel to the roof of a house. The area of the roof is $250 m^{2}$ Assuming that the pressure inside the house is atmosphere pressure, the force exterted by the wind on the roof and the direction of the force will be $(ρ_{air} = 1.2 kg / m^{3})$

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Important Questions on Fluid Mechanics

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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Previous Year Questions)>Q 7

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 of ejection of the liquid through the holes is,

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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Previous Year Questions)>Q 8

Fire is caught at height of

125 m

from the fire brigade. To extinguish the fire, water is coming out from the pipe of diameter

6.4 cm

at a rate of

950 litre \min^{- 1}

. Find out minimum velocity of water exiting from fire brigade tank

(g = 10 m s^{- 2})

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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Previous Year Questions)>Q 9

The total area of wings of an aeroplane is

10 m^{2}

. The speeds of air above and below the wings are

140 m s^{- 1}

and

110 m s^{- 1}

. Then, the force on the aeroplane by air is

(ρ_{air} = 1.28 kg m^{- 3})

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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Previous Year Questions)>Q 10

Two non-mixing liquids of densities

ρ

and

n ρ

(n > 1)

are put in a container. The height of each liquid is

h

. A solid cylinder of length

L

and density

d

is put in this container. The cylinder floats with its axis vertical and length

p L (p < 1)

in the denser liquid. The density

d

is equal to,

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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Previous Year Questions)>Q 11

An object is taken

1.0 km

deep in sea. The density of sea is

1.025 \times 10^{3} kg m^{- 3}

, bulk modulus of object is

1.6 \times 10^{6} K Pa

. Find out percentage change in the density of object.

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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Previous Year Questions)>Q 12

A U-tube with both ends open to the atmosphere is partially filled with water. Oil which is immiscible with water is poured into one side until it stands at a distance of $10 mm$ above the water level on the other side. Meanwhile, the water rises by $65 mm$ from its original level (see diagram). The density of oil is,

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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Previous Year Questions)>Q 13

A small sphere of radius

2 cm

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 attains its terminal velocity is proportional to:

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Beta Question Bank for Medical: Physics>Chapter 13 - Fluid Mechanics>Exercise (Previous Year Questions)>Q 14

Water emerges out as a fountain from a vertical tube at a rate of

3000 Ltr \min^{- 1}

up to height

10 m

. What is the area of cross-section of the tube?

A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m2 Assuming that the pressure inside the house is atmosphere pressure, the force exterted by the wind on the roof and the direction of the force will be ρair =1.2kg/m3

Important Questions on Fluid Mechanics

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A wind with speed $40 m / s$ blows parallel to the roof of a house. The area of the roof is $250 m^{2}$ Assuming that the pressure inside the house is atmosphere pressure, the force exterted by the wind on the roof and the direction of the force will be $(ρ_{air} = 1.2 kg / m^{3})$