Fluid Mechanics

121. 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

122. 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

123. 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

124. 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

125. 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

126. 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

127. 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

128. 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

129. The bulk modulus of elasticity with increase in pressure

  1. increases
  2. decreases
  3. remains constant
  4. increases first up to certain limit and then decreases
  5. unpredictable.

Correct answer: (A)
increases

130. The buoyancy depends on

  1. mass of liquid displaced
  2. viscosity of the liquid
  3. pressure of the liquid displaced
  4. depth of immersion
  5. none of the above.

Correct answer: (A)
mass of liquid displaced

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