Fluid Mechanics

121. Select the correct statement

  1. Local atmospheric pressure depends upon elevation of locality only
  2. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
  3. Local atmospheric pressure is always below standard atmospheric pressure
  4. A barometer reads the difference be-tween local and standard atmospheric pressure
  5. Gauge piessure is equal to atmospheric pressure plus instrument reading.

Correct answer: (B)
Standard atmospheric pressure is the mean local atmospheric pressure a* sea level

122. Specific weight of sea water is more that of pure water because it contains

  1. dissolved air
  2. dissolved salt
  3. suspended matter
  4. all of the above
  5. heavy water.

Correct answer: (D)
all of the above

123. Specific weight of water in S.I. units is equal to

  1. 1000 N/m3
  2. 10000 N/m3
  3. 9.81 xlO3 N/m3
  4. 9.81 xlO6N/m3
  5. 9.81 N/m3.

Correct answer: (C)
9.81 xlO3 N/m3

124. Steady flow occurs when

  1. the direction and magnitude of the velocity at all points are identical
  2. the velocity of successive fluid particles, at any point, is the same at successive periods of time
  3. the magnitude and direction of the velocity do not change from point to point in the fluid
  4. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
  5. velocity, depth, pressure, etc. change from point to point in the fluid flow.

Correct answer: (B)
the velocity of successive fluid particles, at any point, is the same at successive periods of time

125. Surface energy per unit area of a surface is numerically equal to ..

  1. atmospheric pressure
  2. surface tension
  3. force of adhesion
  4. force of cohesion
  5. viscosity.

Correct answer: (B)
surface tension

126. Surface tension

  1. acts in the plane of the interface normal to any line in the surface
  2. is also known as capillarity
  3. is a function of the curvature of the interface
  4. decreases with fall in temperature
  5. has no units.

Correct answer: (A)
acts in the plane of the interface normal to any line in the surface

127. Surface tension has the units of

  1. newtons/m
  2. newtons/m
  3. new tons/m
  4. newtons
  5. newton m.

Correct answer: (C)
new tons/m

128. The angle of contact in case of a liquid depends upon

  1. the nature of the liquid and the solid
  2. the material which exists above the free surface of the liquid
  3. both of die above
  4. any one of the above
  5. none of die above.

Correct answer: (C)
both of die above

129. The atmospheric pressure with rise in altitude decreases

  1. linearly
  2. first slowly and then steeply
  3. first steeply and then gradually
  4. unpredictable
  5. none of the above.

Correct answer: (B)
first slowly and then steeply

130. The bulk modulus of elasticity

  1. has the dimensions of 1/pressure
  2. increases with pressure
  3. is large when fluid is more compressible
  4. is independent of pressure and viscosity
  5. is directly proportional to flow.

Correct answer: (B)
increases with pressure

Previous
Page 13 of 21
Next
Copyright © EngineeringMCQ.com