Hydraulic and Fluid Mechanics

121. Density of water is maximum at

  1. 0° C
  2. 0° K
  3. 4° C
  4. 100° C

Correct answer: (C)
4° C

122. Differential manometer is used to measure

  1. Pressure in pipes, channels etc.
  2. Atmospheric pressure
  3. Very low pressure
  4. Difference of pressure between two points

Correct answer: (D)
Difference of pressure between two points

123. Dimensions of surface tension are

  1. ML°T-2
  2. ML°T
  3. ML r2
  4. ML2T2

Correct answer: (A)
ML°T-2

124. During the opening of a valve in a pipe line, the flow is

  1. Steady
  2. Unsteady
  3. Uniform
  4. Laminar

Correct answer: (B)
Unsteady

125. Dynamic viscosity of most of the gases with rise in temperature

  1. Increases
  2. Decreases
  3. Remain unaffected
  4. Unpredictable

Correct answer: (A)
Increases

126. Dynamic viscosity of most of the liquids with rise in temperature

  1. Increases
  2. Decreases
  3. Remain unaffected
  4. Unpredictable

Correct answer: (B)
Decreases

127. Euler's dimensionless number relates the following

  1. B and C
  2. Inertial force and gravity
  3. Viscous force and buoyancy force
  4. Pressure force and inertial force

Correct answer: (D)
Pressure force and inertial force

128. Euler's equation in the differential form for the motion of liquids is given by

  1. dp/ + g.dz + v.dv = 0
  2. dp/ - g.dz + v.dv = 0
  3. dp + g.dz + v.dv = 0
  4. dp - g.dz + v.dv = 0

Correct answer: (A)
dp/ + g.dz + v.dv = 0

129. Euler's number is the ratio of

  1. Inertia
  2. Gravity
  3. Viscous
  4. None of these

Correct answer: (A)
Inertia

130. Falling drops of water become spheres due to the property of

  1. Adhesion
  2. Cohesion
  3. Surface tension
  4. Viscosity

Correct answer: (C)
Surface tension

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