hydraulics and fluid mechanics MCQs – Page 9

Practise focused hydraulics and fluid mechanics questions with marked answers for exam preparation and subject revision.

hydraulics and fluid mechanics Mcqs
161. The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to________________?
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A. 91Pa

B. 9810 Pa

C. 981 Pa

D. 1 Pa

E. 98,100 Pa

162. Metacentric height is given as the distance between_______________?
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A. the center of gravity of the body andthe meta center

B. center of buoyancy and metacentre

C. the center of gravity of the body and the center of buoyancy

D. the center of gravity of the body and the center of pressure

E. none of the above

163. The region between the separation streamline and the boundary surface of the solid body is known as_________________?
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A. lift

B. wake

C. drag

D. boundary layer

E. aerofoil section

164. The peoperty by virtue of which a liquid opposes relative motion between its different layers is called_________________?
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A. viscosity

B. co-efficient of viscosity

C. surface tension

D. osmosis

E. cohesion

165. Buoyant force is___________________?
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A. the resultant force on a body due to the fluid surrounding it

B. force necessary to keep a body in equilibrium

C. none of the above

D. resultant force acting on a floating body

E. equal to the volume of liquid displaced

166. Surface energy per unit area of a surface is numerically equal to___________________?
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A. force of adhesion

B. force of cohesion

C. surface tension

D. viscosity

E. atmospheric pressure

167. Choose the wrong statement___________________?
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A. Center of pressure acts at a greater depth than center of gravity

B. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area

C. The horizontal component acts through the center of pressure for the vertical projection

D. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface

E. he vertical component passes through the center of pressure of the volume
168. The units of dynamic or absolute viscosity are_______________?
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A. none of the above

B. metres2 per sec

C. kg sec/meter

D. newton-sec2 per meter

E. newton-sec per meter
169. The resultant upward pressure of the fluid on an immersed body is called__________________?
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A. buoyancy

B. all the above are correct

C. upthrust

D. none of above is correct

E. center of pressure

170. The normal stress is same in all directions at a point in a fluid ___________________?
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A. only when the fluid is incompressible and has zero viscosity

B. when there is no motion of one fluid layer relative to an adjacent layer

C. irrespective of the motion of one fluid layer relative to an adjacent layer

D. in case of an ideal fluid

E. only when the fluid is frictionless

171. Cavitation will begin when______________________?
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A. none of the above

B. the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

C. pressure is increased

D. flow is increased

E. pressure becomes more than critical pressure

172. For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal__________________?
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A. ratio of inertial force to force due to gravitation

B. all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

C. ratio of inertial force to force due to surface tension

D. ratio of inertial force to force due to viscosity

173. In an immersed body, center of pressure is ____________________?
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A. above the center of gravity

B. could be above or below e.g. depending on density of body and liquid

C. below be center of gravity

D. unpredictable

E. at the center of gravity

174. Ratio of inertia force to elastic force is known as _____________________?
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A. Reynolds number

B. none of the above

C. Webers number

D. Froude number

E. Mach number
175. Resultant pressure of the liquid in the case of an immersed body acts through _________________?
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A. metacentre

B. center of gravity

C. in between e.g. and center of pressure

D. center of pressure

E. center of buoyancy

176. Two pipe systems can be said to be equivalent, when the following quantites are same______________?
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A. length and diameter

B. flow and length

C. friction loss and flow

D. friction factor and diameter

E. velocity and diameter

177. The total energy of each particle at various places in the case of perfect incompres sible fluid flowing in continuous sream________________?
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A. keeps on decreasing

B. may increase/decrease

C. remains constant

D. keeps on increasing

E. unpredictable

178. The two important forces for a floating body are___________________?
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A. buoyancy, pressure

B. inertial, gravity

C. buoyancy, inertial

D. buoyancy, gravity

E. gravity, pressure

179. The resultant of all normal pressures acts_________________?
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A. at center of pressure

B. at metacentre

C. vertically downwards

D. vertically upwards

E. at e.g. of body

180. Flow of water in a pipe about 3 meters in diameter can be measured by_________________?
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A. venturi

B. rotameter

C. nozzle

D. orifice plate

E. pitot tube