Fluid Mechanics

141. 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

142. 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

143. The flow in which conditions do not change with time at any point, is known as

  1. one dimensional flow
  2. uniform flow
  3. steady flow
  4. turbulent flow
  5. streamline flow.

Correct answer: (C)
steady flow

144. The flow in which each liquid particle has a definite path and their paths do not cross each other is called

  1. one dimensional flow
  2. uniform flow
  3. steady flow
  4. turbulent flow
  5. streamline flow.

Correct answer: (E)
streamline flow.

145. The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as

  1. one dimensional flow
  2. uniform flow
  3. steady flow
  4. turbulent flow
  5. streamline flow.

Correct answer: (D)
turbulent flow

146. The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as

  1. one dimensional flow
  2. uniform flow
  3. steady flow
  4. turbulent flow
  5. streamline flow.

Correct answer: (B)
uniform flow

147. The flow which neglects changes in a transverse direction is known as

  1. one dimensional flow
  2. uniform flow
  3. steady flow
  4. turbulent flow
  5. streamline flow.

Correct answer: (A)
one dimensional flow

148. The fluid forces considered in the Navier Stokes equation are

  1. gravity, pressure and viscous
  2. gravity, pressure and turbulent
  3. pressure, viscous and turbulent
  4. gravity, viscous and turbulent
  5. none of the above.

Correct answer: (A)
gravity, pressure and viscous

149. The horizontal component of buoyant force is

  1. negligible
  2. same as buoyant force
  3. zero

Correct answer: (C)
zero

150. The increase of temperature results in

  1. increase in viscosity of gas
  2. increase in viscosity of liquid
  3. decrease in viscosity of gas
  4. decrease in viscosity of liquid
  5. (a) and (d) above.

Correct answer: (D)
decrease in viscosity of liquid

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