Fluid Mechanics

131. The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately

  1. 1 mm
  2. 5 mm
  3. 10 mm
  4. 20 mm
  5. 30 mm.

Correct answer: (E)
30 mm.

132. The center of gravity of the volume of the liquid displaced by an immersed body is called

  1. meta-center
  2. center of pressure
  3. center of buoyancy
  4. center of gravity
  5. none of the above.

Correct answer: (C)
center of buoyancy

133. The center of pressure of a surface subjected to fluid pressure is the point

  1. on the surface at which resultant pres-sure acts
  2. on the surface at which gravitational force acis
  3. at which all hydraulic forces meet
  4. similar to metacentre
  5. where pressure equivalent to hydraulic thrust will act.

Correct answer: (A)
on the surface at which resultant pres-sure acts

134. The centre of gravity of the volume of the liquid displaced by an immersed body is called

  1. centre of gravity
  2. centre of pressure
  3. metacentre
  4. centre of buoyancy
  5. centroid.

Correct answer: (D)
centre of buoyancy

135. The conditions for the stable equilibrium of a floating body are

  1. the meta-center should lie above the center of gravity
  2. the center of buoyancy and the center of gravity must lie on the same vertical line
  3. a righting couple should be formed
  4. all the above are correct
  5. none of the above is correct.

Correct answer: (D)
all the above are correct

136. The continuity equation is connected with

  1. viscous/unviscous fluids
  2. compressibility of fluids
  3. conservation of mass
  4. steady/unsteady flow
  5. open channel/pipe flow.

Correct answer: (C)
conservation of mass

137. The density of water is 1000 kg/m3 at

  1. 0°C
  2. 0°K
  3. 4°C
  4. 20°C
  5. all temperature.

Correct answer: (C)
4°C

138. The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is

  1. 2.4 m
  2. 3.0 m
  3. 4.0 m
  4. "2.5 m
  5. 5.0 m.

Correct answer: (B)
3.0 m

139. The difference of pressure between the inside and outside of a liquid drop is

  1. p = Txr
  2. p = T/r
  3. p = T/2r
  4. p = 2T/r
  5. none of the above.

Correct answer: (D)
p = 2T/r

140. The equation of continuity holds good when the flow

  1. is steady
  2. is one dimensional
  3. velocity is uniform at all the cross sections
  4. all of the above
  5. none of the above.

Correct answer: (D)
all of the above

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