# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 4

36.

Reynold's number is the ratio of the inertia force to the

 A. surface tension force B. viscous force C. gravity force D. elastic force

Explanation:

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37.

A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is

 A. 3.53 kN B. 33.3 kN C. 35.3 kN D. none of these

Explanation:

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38.

A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

 A. equal to B. less than C. more than

Explanation:

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39.

The total pressure on an immersed surface inclined at an angle θ with the liquid surface is

 A. wA B. wx C. wAx D. wAx/sin θ

Explanation:

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40.

Turbulent flow takes place at high velocities.

 A. Agree B. Disagree