 # Hydraulics and Fluid Machines - Hydraulics and Fluid Machines objective type questions and answers

11. Newtons law of viscosity states that.......

A.Shear stress is directly proportional to the velocity

B.Shear stress is directly proportional to the velocity gradient

C.Shear stress is directly proportional to shear strain

D.Shear stress is directly proportional to the viscosity

B.shear stress is directly proportional to the velocity gradient

12. The volumetric change of the fluid caused by the resistance is known as .......

A.Volumetric strain

B.Volumetric index

C.Compressibility

C.Compressibility

13. Surface tension has the units of.........

A.force per unity area

B.Force per unit length

C.Force per unit volume

D.None of the above

B.Force per unit length

14. Density of water is maximum at ......

A.00C

B.00K

C.40C

D.1000C

D.40C

15. The gases are considered incompressible when Mach number .......

A.Is equal to 1

B.Is equal to .50

C.Is the more then .3

D.Is less than .2

D.Is less than .2