84) To avoid an interruption in the flow of a syphon, an air vessel is provided

Answer is:

at the summit

Water Resources Engineering MCQ with Answers

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85) The vapour pressure over the concave surface is

Answer is:

less man the vapour pressure over the plane surface

86) The property by virtue of which a liquid opposes relative motion between its different layers is called

Answer is:

viscosity

Explanation:

Viscosity is also known as absolute viscosity or dynamic viscosity. It is defined as the property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid. The viscosity of a liquid is due to cohesion and interaction between particles.