hydraulics and fluid mechanics MCQs – Page 10

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

hydraulics and fluid mechanics Mcqs

181. Choose the wrong statement?
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A. Relative density of liquids can be determined by means of the depth of flotation of hydrometer

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

C. any weight, floating or immersed in a liquid, is acted upon by a buoyant force

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

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

182. Reynolds number is significant in____________________?
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A. supersonics, as with projectile and jet propulsion

B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc

C. none of the above

D. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ships hulls

E. all of the above

183. A one dimensional flow is one which___________________?
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A. takes place in straight lines

B. takes place in one dimension

C. is uniform flow

D. is steady uniform flow

E. involves zero transverse component of flow

184. At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be_______________?
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A. minimum

B. zero

C. maximum

D. negative value

E. could be any value

185. Bernoulli equation deals with the law of conservation of____________________?
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A. momentum

B. mass

C. force

D. energy

E. work

186. A metal with specific gravity of o floating in a fluid of same specific gravity a will___________________?
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A. none of the above

B. partly immersed

C. be fully immersed with top surface at fluid surface

D. float over fluid

E. sink to bottom

187. In aerodynamics, hypersonic flow generally begins above which Mach number?
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A. unity

B. Mach 5

C. greater than unity

D. greater than 2

E. greater than 10

188. Working principle of dead weight pressure gauge tester is based on __________________?
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A. Newtons law of viscosity .

B. Second law of thermodynamic

C. Pascals law

D. Daltons law of partial pressure

E. Avogadros hypothesis

189. Why has mercury traditionally been used in liquid-column barometers?
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A. It is the best liquid for every instrument

B. Its high density keeps the column relatively short

C. Its vapor pressure is very low

D. Both B and C

E. It moves more easily than every other liquid

190. The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as___________________?
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A. turbulent flow

B. steady flow

C. one dimensional flow

D. streamline flow

E. uniform flow

191. The capillary rise at 20C in a clean glass tube of 1 mm bore containing water is ap-proximately_______________?
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A. 10 mm

B. 30 mm

C. 1 mm

D. 20 mm

E. 5 mm

192. The capillary rise at 20C in a clean glass tube of 1 mm bore containing water is ap-proximately____________________?
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A. 20 mm

B. 1 mm

C. 10 mm

D. 30 mm

E. 5 mm

193. The difference of pressure between the inside and outside of a liquid drop is_____________?
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A. = Txr

B. none of the above

C. p = 2T/r

D. p = T/2r

E. = T/r

194. Capillary action is due to the__________________?
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A. cohesion of the liquid

B. none of the above

C. adhesion of the liquid molecules and the molecules on the surface of a solid

D. surface tension

E. all of the above

195. The time oscillation of a floating body with increase in metacentric height will be________________?
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A. same

B. unpredictable

C. lower

D. lower/higher depending on weight of body

E. higher

196. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as____________________?
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A. center of gravity

B. meta center

C. none of the above

D. center of buoyancy

E. center of pressure

197. True one-dimensional flow occurs when___________________?
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A. the magnitude and direction of the velocity do not change from point to point in the fluid

B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

C. the direction and magnitude of the veiocity at all points are identical

D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

E. velocity, depth, pressure etc. change from point to point in the fluid flow

198. Hydrometer is used to determine________________?
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A. density

B. specific gravity of gases

C. specific gravity of solids

D. specific gravity of liquids

E. relative humidity

199. If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water___________________?
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A. 52.2 cm

B. 50 cm

C. 51 cm

D. 51.7 cm

E. 52 cm

200. According to Bernoullis equation for steady ideal fluid flow_______________?
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A. velocity and pressure are inversely proportional

B. the energy is constant along a stream-line but may vary across streamlines

C. principle of conservation of mass holds

D. total energy is constant throughout

E. none of the above

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