# Fluid Mechanics

Fluid Mechanics

A. The absolute roughness of a pipe de-creases with time
B. A pipe becomes smooth after using for long time
C. The friction factor decreases with time
D. The absolute roughness increases with time

A. gm/cm-sec2
B. dyne-sec/cm2
C. gm/cm2-sec
D. cm2/sec

A. pressure
B. kinematic viscosity
C. dynamic viscosity
D. surface tension

A. one which obeys Newton’s law of viscosity
B. frictionless and incompressible
C. very viscous
D. frictionless and compressible

A. 0.25
B. 0.50
C. 1.0
D. none of the above

A. decreases with increase in temperature
B. increases with increase in temperature
C. is independent of temperature
D. is independent of pressure for very high pressure intensities

A. intensity of pressure and rate of angular deformation
B. shear stress and rate of angular deformation
C. shear stress, viscosity and temperature
D. viscosity and rate of angular deformation

A. at the centroid of the submerged area
B. always above the centroid of the area
C. always below the centroid of the area
D. none of the above

A. 3.75 m
B. 4.0 m
C. 4.2m
D. 4.5m