Hydraulic and Fluid Mechanics

231. Stoke is the unit of

1. Kinematic viscosity in C. G. S. units
2. Kinematic viscosity in M. K. S. units
3. Dynamic viscosity in M. K. S. units
4. Dynamic viscosity in S. I. units

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232. 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

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233. 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

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234. Surface tension has the units of

1. Newton-sec/m
2. Newton-m/sec
3. Newton/m
4. Newton

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235. The absolute pressure is equal to

1. Gauge pressure + atmospheric pressure
2. Gauge pressure - atmospheric pressure
3. Atmospheric pressure - gauge pressure
4. Gauge pressure - vacuum pressure

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236. 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

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237. The atmospheric pressure at sea level is

1. 103 kN/m²
2. 10.3 m of water
3. 760 mm of mercury
4. All of these

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238. The atmospheric pressure with rise in altitude decreases

1. Linearly
2. First slowly and then steeply
3. First steeply and then gradually
4. Unpredictable

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239. The Bernoulli's equation is based on the assumption that

1. There is no loss of energy of the liquid flowing
2. The velocity of flow is uniform across any cross-section of the pipe
3. No force except gravity acts on the fluid
4. All of the above

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240. The body will float if the force of buoyancy is

1. Equal to
2. Less than
3. More than
4. None of these

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