Fluid Mechanics

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

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

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112. 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.

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113. Rain drops are spherical because of

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

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114. 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.

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115. 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.

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116. 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.

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117. 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.

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118. Rotameter is a device used to measure

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

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119. 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.

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120. 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.

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