fluid mechanics mechanical engineering MCQs – Page 4

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

fluid mechanics mechanical engineering Mcqs

151. Choose the wrong statement?
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A. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force

B. Viscosity is expressed as poise, stoke, or saybolt seconds

C. Viscosity of liquids decreases with in-crease in temperature

D. Viscosity is due primarily to interaction between fluid molecules

E. Viscosity of liquids is appreciably affected by change in pressure

152. For very great pressures, viscosity of moss gases and liquids__________________?
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A. decreases

B. increases

C. shows erratic behavior

D. none of the above

E. remains same

153. Free surface of a liquid tends to contract to the smallest possible area due to force of_______________?
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A. surface tension

B. friction

C. viscosity

D. adhesion

E. cohesion

154. The property of a fluid which enables it to resist tensile stress is known as___________________?
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A. adhesion

B. compressibility

C. surface tension

D. cohesion

E. viscosity

155. The ratio of absolute viscosity to mass density is known as_________________?
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A. kinematic viscosity

B. viscosity index

C. coefficient of viscosity

D. coefficient of compressibility

E. specific viscosity

156. The difference of pressure between the inside and outside of a liquid drop is _______________?
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A. p = 2T/r

B. p = T/2r

C. p = T/r

D. p = Txr

E. none of the above

157. The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to_________________?
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A. 21,000

B. 10,000

C. 2100

D. 1000

E. 2700

158. The density of water is 1000 kg/m3 at__________________?
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A. 0K

B. all temperature

C. 4C D. 20C

D. 0C

159. Choose the wrong statement?
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A. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface

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. Center of pressure acts at a greater depth than center of gravity

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

E. he vertical component passes through the center of pressure of the volume

160. Specific weight of sea water is more that of pure water because it contains_________________?
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A. dissolved air

B. heavy water

C. suspended matter

D. all of the above

E. dissolved salt

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

181. The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be ________________?
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A. 4000 kg

B. 500 kg

C. 1500 kg

D. 1000 kg

E. 2000 kg

182. An object having 10 kg mass weighs 9.81kg on a spring balance. The value of g at this place is _________________?
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A. 9.75 m/sec2

B. 10.2/m sec

C. 9 m/sec

D. 10m/sec2

E. 9.81 m/sec2

183. For manometer, a better liquid combination is one having ___________________?
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A. low density and viscosity

B. surface tension is no criterion

C. high density and viscosity

D. lower surface tension

E. higher surface tension

184. Density of water is maximum at__________________?
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A. 100C

B. 4C

C. 0C

D. 20C.

E. 0K

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Showing 151 to 184 of 184 mcqs