# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 3

21.

Select the correct statement

 A. Weber's number is the ratio of inertia force to elastic force. B. Weber's number is the ratio of gravity force to surface tension force. C. Weber's number is the ratio of viscous force to pressure force. D. Weber's number is the ratio of inertia force to surface tension force.

Answer: Option D

Explanation:

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22.

The specific weight of sea water is __________ that of pure water.

 A. same as B. less than C. more than

Answer: Option C

Explanation:

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23.

If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, The body is said to be in __________ equilibrium.

 A. neutral B. stable C. unstable

Answer: Option A

Explanation:

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24.

The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called

 A. Newton's law of motion B. Newton's law of cooling C. Newton's law of viscosity D. Newton's law of resistance

Answer: Option D

Explanation:

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25.

The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

 A. 1/2 depth B. 1/2 breadth C. 1/2 sloping side D. 1/4 (depth + breadth)

Answer: Option A

Explanation:

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