Physics
Fluid-Mechanics
Easy
Question
A drop of liquid of diameter 2.8 mm breaks up into 125 identical drops. The change in energy is nearly (S.T. of liquid =75 dynes/cm)
- Zero
- 19 erg
- 46 erg
- 74 erg
The correct answer is: 74 erg
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Column - I |
Column - II |
||
| i. |
Young's modules of a substance |
a. |
Depends on temperature |
| ii. |
Bulk modulus of substance |
b. |
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Modulus of rigidity of a substance |
c. |
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Volume of a substance |
d. |
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Column - I |
Column - II |
||
| i. |
Young's modules of a substance |
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Depends on temperature |
| ii. |
Bulk modulus of substance |
b. |
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Column - I |
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d. |
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Column - I |
Column - II |
||
| i. |
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a. |
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| ii. |
Formation of bigger drop from small droplets |
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Column - I |
Column - II |
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| Volume changes |
c. |
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| Tensile stress |
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Column - I |
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a. |
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Column - II |
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| i. |
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a. |
Uniform stresses developed in the rod |
| ii. |
|
b. |
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| iii. |
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c. |
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| iv. |
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| i. |
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a. |
Uniform stresses developed in the rod |
| ii. |
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b. |
Non- uniform stresses developed in the rod |
| iii. |
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c. |
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| iv. |
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Molecular forces exist between the molecules of a liquid in a container. The molecules on the surface have unequal force leading to a tension on the surface. If this is not compensated by a farce, the equilibrium of the liquid will be a difficult task. This leads to an excess pressure on the surface. The nature of the meniscus can inform us of the direction of the excess pressure. The angle of contact of the liquid decided by the forces between the molecules, air-and container can make the angle of contact.
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The direction of the excess pressure in the meniscus of a liquid of angle of contact 
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The direction of the excess pressure in the meniscus of a liquid of angle of contact is
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