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Hydraulic and Fluid Machines - Interview Questions and Answers

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141. The normal stress in a fluid will be constant in all directions at a point only if
A. it is incompressible
B. it has uniform viscosity
C. it has zero viscosity
D. it is frictionless
E. it is at rest.
Explanation:
142. Mercury is often used in barometer because
A. it is the best liquid
B. the height of barometer will be less
C. its vapour pressure is so low that it may be neglected
D. both (b) and (c)
E. it moves easily.
Explanation:
143. Newton's law of viscosity is a relationship between
A. shear stress anctthejiate of angular dis�tortion
B. shear stress and viscosity
C. shear stress, velocity and viscosity
D. pressure, velocity and viscosity
E. shear stress, pressure and rate of an-gular distortion.
Explanation:
144. The peoperty by virtue of which a liquid opposes relative motion between its different layers is called
A. surface tension
B. co-efficient of viscosity
C. viscosity
D. osmosis
E. cohesion.
Explanation:
145. Liquids transmit pressure equally in all the directions. This is according to
A. Boyle's law
B. Archimedes principle
C. Pascal's law
D. Newton's formula
E. Chezy's equation.
Explanation:
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