Fluid Mechanics

111. Pressure of the order of 10"' torr can be measured by

  1. Bourdon tube
  2. Pirani Gauge
  3. micro-manometer
  4. ionisastion gauge
  5. McLeod gauge.

Correct answer: (D)
ionisastion gauge

112. Principle of similitude forms the basis of

  1. comparing two identical equipments
  2. designing models so that the result can be converted to prototypes
  3. comparing similarity between design and actual equipment
  4. hydraulic designs
  5. performing acceptance tests.

Correct answer: (B)
designing models so that the result can be converted to prototypes

113. Property of a fluid by which its own molecules are attracted is called

  1. adhesion
  2. cohesion
  3. viscosity
  4. compressibility
  5. surface tension.

Correct answer: (B)
cohesion

114. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called

  1. adhesion
  2. cohesion
  3. viscosity
  4. compressibility
  5. surface tension.

Correct answer: (A)
adhesion

115. Rain drops are spherical because of

  1. viscosity
  2. air resistance
  3. surface tension forces
  4. atmospheric pressure
  5. none of the above.

Correct answer: (C)
surface tension forces

116. Ratio of inertia force to elastic force is known as

  1. Mach number
  2. Froude number
  3. Reynold's number
  4. Weber's number
  5. none of the above.

Correct answer: (A)
Mach number

117. Ratio of inertia force to surface Jension is known as

  1. Mach number
  2. Froude number
  3. Reynold's number
  4. Weber's number
  5. none of the above.

Correct answer: (D)
Weber's number

118. Resultant pressure of the liquid in the case of an immersed body acts through

  1. centre of gravity
  2. centre of pressure
  3. metacentre
  4. centre of buoyancy
  5. in between e.g. and centre of pressure.

Correct answer: (B)
centre of pressure

119. Reynolds number is significant in

  1. supersonics, as with projectile and jet propulsion
  2. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
  3. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship's hulls
  4. all of the above
  5. none of the above.

Correct answer: (B)
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

120. Rotameter is a device used to measure

  1. absolute pressure
  2. velocity of fluid
  3. flow
  4. rotation
  5. velocity of air.

Correct answer: (C)
flow

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