Gamma Question Bank for Engineering Physics>Chapter 9 - Mechanical Properties of Fluids>Assignment>Q 29

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The amount of work done in blowing up a soap bubble of radius $2 cm$ is [Given surface tension of soap solution $= 4 \times 10^{- 2} N m^{- 1}$ ]

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Important Questions on Mechanical Properties of Fluids

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Gamma Question Bank for Engineering Physics>Chapter 9 - Mechanical Properties of Fluids>Assignment>Q 31

Adding detergents to the water increases its

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Gamma Question Bank for Engineering Physics>Chapter 9 - Mechanical Properties of Fluids>Assignment>Q 32

Water rises to a height

h

when a capillary of radius

r

is dipped in water. For another capillary of radius

2 r

dipped in water, it rises to the height

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Gamma Question Bank for Engineering Physics>Chapter 9 - Mechanical Properties of Fluids>Assignment>Q 35

To what height does a liquid of density

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

and surface tension

0.05 {Nm}^{- 1}

rise in a capillary tube of radius

0.2 mm

when dipped in? [Given

\cos θ = 0.4, g = 10 {ms}^{- 2}

]

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Gamma Question Bank for Engineering Physics>Chapter 9 - Mechanical Properties of Fluids>Assignment>Q 36

The pressure inside an air bubble of radius

2 cm

formed

20 cm

below an open water surface is (Given surface tension of water

= 70 \times 10^{- 3} {Nm}^{- 1}

)

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Gamma Question Bank for Engineering Physics>Chapter 9 - Mechanical Properties of Fluids>Assignment>Q 37

The minimum force required to separate a light glass plate of perimeter

5 m

from a water surface is (Given surface tension of water

= 70 \times 10^{- 3} N m^{- 1}

)

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Gamma Question Bank for Engineering Physics>Chapter 9 - Mechanical Properties of Fluids>Assignment>Q 38

Three capillaries of length

L, \frac{L}{2}

and

\frac{L}{3}

are connected in a series. Their radii are

r, \frac{r}{2}

and

\frac{r}{3}

respectively. If a streamlined flow is to be maintained and pressure difference across the first capillary is

p

, then the pressure difference across the second capillary will be

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Gamma Question Bank for Engineering Physics>Chapter 9 - Mechanical Properties of Fluids>Assignment>Q 40

The terminal velocity of small sized spherical body of radius

r

falling vertically in a viscous liquid is given by the following proportionality

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Gamma Question Bank for Engineering Physics>Chapter 9 - Mechanical Properties of Fluids>Assignment>Q 46

Eight raindrops each of radius

R

fall through air with terminal velocity

6 cm s^{- 1} .

What is the terminal velocity of the bigger drop formed by coalescing these drops together?