The approximate depth of an ocean is \(2700~\text{m}\). The compressibility of water is \(45.4\times10^{-11}~\text{Pa}^{-1}\) and the density of water is \(10^{3}~\text{kg/m}^3\). What fractional compression of water will be obtained at the bottom of the ocean?
1. \(0.8\times 10^{-2}\)
2. \(1.0\times 10^{-2}\)
3. \(1.2\times 10^{-2}\)
4. \(1.4\times 10^{-2}\)

Subtopic:  Pressure |
 69%
From NCERT
NEET - 2015
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The wettability of a surface by a liquid depends primarily on:
1. surface tension.
2. density.
3. angle of contact between the surface and the liquid.
4. viscosity.
Subtopic:  Surface Tension |
 85%
From NCERT
AIPMT - 2013
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A small sphere of radius r falls from rest in a viscous liquid. As a result, heat is produced due to the viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to

1. r3

2. r2

3. r4

4. r5

Subtopic:  Stokes' Law |
 65%
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A small hole of an area of cross-section \(2~\text{mm}^2\) is present near the bottom of a fully filled open tank of height \(2~\text{m}\). Taking \(g = 10~\text{m/s}^2\), the rate of flow of water through the open hole would be nearly:
1. \(6.4\times10^{-6}~\text{m}^{3}/\text{s}\)
2. \(12.6\times10^{-6}~\text{m}^{3}/\text{s}\)
3. \(8.9\times10^{-6}~\text{m}^{3}/\text{s}\)
4. \(2.23\times10^{-6}~\text{m}^{3}/\text{s}\)

Subtopic:  Bernoulli's Theorem |
 73%
From NCERT
NEET - 2019
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A soap bubble, having a radius of \(1~\text{mm}\), is blown from a detergent solution having a surface tension of\(2.5\times 10^{-2}~\text{N/m}\). The pressure inside the bubble equals at a point \(Z_0\) below the free surface of the water in a container. Taking \(g = 10~\text{m/s}^{2}\), the density of water \(= 10^{3}~\text{kg/m}^3\), the value of \(Z_0\) is:

1. \(0.5~\text{cm}\) 2. \(100~\text{cm}\)
3. \(10~\text{cm}\) 4. \(1~\text{cm}\)
Subtopic:  Surface Tension |
 55%
From NCERT
NEET - 2019
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The density of ice is x gm/cc and that of water is y gm/cc. What is the change in volume in cc, when m gm of ice melts?

1.  M(y-x)

2.  (y-x)/m

3.  mxy(x-y)

4.  m(1/y-1/x)

Subtopic:  Properties of Fluids |
 59%
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A rectangular film of liquid is extended from \((4~\text{cm} \times 2~\text{cm})\) to \((5~\text{cm} \times 4~\text{cm}).\) If the work done is \(3\times 10^{-4}\) J, the value of the surface tension of the liquid is:
1. \(0.250\) Nm-1
2. \(0.125\) Nm-1
3. \(0.2\) Nm-1
4. \(8.0\) Nm-1

Subtopic:  Surface Tension |
 69%
From NCERT
NEET - 2016
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A small sphere of radius \(r\) falls from rest in a viscous liquid. As a result, heat is produced due to the viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to:
1. \(r^3\)
2. \(r^2\)
3. \(r^5\)
4. \(r^4\)

Subtopic:  Stokes' Law |
 54%
From NCERT
NEET - 2018
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A body weighs 160 g in air, 130 g in water and 136 g in oil. The specific gravity of oil is
1. 0.2 

2. 0.6

3. 0.7 

4. 0.8

Subtopic:  Properties of Fluids |
 61%
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Three liquids of densities \(d,\) \(2d\) and \(3d\) are mixed in equal proportions of weights. The relative density of the mixture is: 

1. \(11d \over 7\) 2. \(18d \over 11\)
3. \(13d \over 9\) 4. \(23d \over 18\)
Subtopic:  Properties of Fluids |
 74%
From NCERT
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