fluid mechanics mechanical engineering MCQs – Page 9

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

fluid mechanics mechanical engineering Mcqs

161. Choose the wrong statement ?
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A. any weight, floating or immersed in a liquid, is acted upon by a buoyant force

B. The point through which buoyant force acts, is called the center of buoyancy

C. Center of buoyancy is located above the center of gravity of the displaced liquid v

D. Buoyant force is equal to the weight of the liquid displaced

E. Relative density of liquids can be determined by means of the depth of flotation of hydrometer

162. Units of surface tension are____________________?
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A. energy/unit area

B. distance

C. both of the above

D. it has no units

E. none of the above

163. The vapour pressure over the concave surface is______________________?
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A. equal to the vapour pressure over the plane surface

B. none of the above

C. zero

D. less man the vapour pressure over the plane surface

E. greater than the vapour pressure over the plane surface

164. Falling drops of water become spheres due to the property of ____________________?
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A. adhesion

B. viscosity

C. compressibility

D. surface tension

E. cohesion

165. Surface energy per unit area of a surface is numerically equal to _____________________?
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A. atmospheric pressure

B. force of cohesion

C. force of adhesion

D. viscosity

E. surface tension

166. Practical fluids___________________?
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A. possess none of the above properties

B. are viscous

C. are compressible

D. possess surface tension

E. possess all the above properties

167. The property of fluid by virtue of which it offers resistance to shear is called________________?
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A. adhesion

B. all of the above

C. surface tension

D. cohesion

E. viscosity

168. If no resistance is encountered by displacement, such a substance is known as ___________________?
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A. fluid

B. water

C. perfect solid

D. ideal fluid

E. gas

169. Property of a fluid by which its own molecules are attracted is called___________________?
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A. surface tension

B. compressibility

C. cohesion

D. viscosity

E. adhesion

170. Select the correct statement?
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A. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level

B. Local atmospheric pressure depends upon elevation of locality only

C. Local atmospheric pressure is always below standard atmospheric pressure

D. A barometer reads the difference be-tween local and standard atmospheric pressure

E. Gauge piessure is equal to atmospheric pressure plus instrument reading

171. Viscosity of water in comparison to mercury is_________________?
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A. higher

B. higher/lower depending on temperature

C. unpredictable

D. lower

E. same

172. Choose the wrong statement ?
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A. For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy

B. If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions

C. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy

D. All floating bodies are stable

E. The center of buoyancy is located at the center of gravity of the displaced liquid

173. Choose the correct relationship ?
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A. specific gravity = gravity x density

B. kinematicviscosity = dynamicviscosity x density

C. dynamicviscosity = kinematicviscosity x density

D. gravity = specific gravity x density

E. hydrostaticforce = surface tension x gravity

174. Fluid is a substance that___________________?
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A. cannot be subjected to shear forces

B. flows

C. cannot remain at rest under action of any shear force

D. always expands until it fills any container

E. has the same shear stress.at a point regardless of its motion

175. The buoyancy depends on___________________?
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A. mass of liquid displaced

B. none of the above

C. pressure of the liquid displaced

D. viscosity of the liquid

E. depth of immersion

176. Alcohol is used in manometer, because____________________?
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A. it provides accurate readings

B. it provides suitable meniscus for the inclined tube

C. its vapour pressure is low

D. its density is less

E. it provides longer length for a given pressure difference

177. The specific weight of water is 1000 kg/m_________________?
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A. none of the above

B. at normal pressure of 760 mm

C. at 4C temperature

D. at mean sea level

E. all the above

178. To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than____________________?
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A. 5.0 above the hydraulic gradient

B. 2.4 m above the hydraulic gradient

C. 10.0 m above the hydraulic gradient

D. none of the above

E. 6.4 m above the hydraulic gradient

179. When the flow parameters at any given instant remain same at every point, then flow is said to be___________________?
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A. laminar

B. quasi static

C. static

D. steady state

E. uniform

180. Alcohol is used in manometers because___________________?
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A. it has low surface tension

B. is provides suitable meniscus

C. it is clearly visible

D. it can provide longer column due to low density

E. it has low vapour pressure

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