fluid mechanics mechanical engineering MCQs – Page 8

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

fluid mechanics mechanical engineering Mcqs

141. The center of pressure of a surface subjected to fluid pressure is the point_______________?
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A. similar to metacentre

B. where pressure equivalent to hydraulic thrust will act

C. on the surface at which gravitational force acis

D. on the surface at which resultant pres-sure acts

E. at which all hydraulic forces meet

142. Flow of water in a pipe about 3 metres in diameter can be measured by__________________?
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A. orifice plate

B. nozzle

C. venturi

D. rotameter

E. pitot tube

143. The conditions for the stable equilibrium of a floating body are___________________?
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A. all the above are correct

B. a righting couple should be formed

C. the center of buoyancy and the center of gravity must lie on the same vertical line

D. none of the above is correct

E. the meta-center should lie above the center of gravity

144. A one dimensional flow is one which_________________?
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A. involves zero transverse component of flow

B. is steady uniform flow

C. takes place in one dimension

D. takes place in straight lines

E. is uniform flow

145. 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. 51 cm

C. 50 cm

D. 52 cm

E. 51.7 cm

146. The upper surface of a weir over which water flows is known is_____________________?
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A. contracta

B. sill

C. nappe

D. crest

E. weir top

147. In a free vortex motion, the radial component of velocity everywhere is________________?
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A. non-zero and finite

B. unpredictable

C. zero

D. maximum

E. minimum

148. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the_________________?
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A. none of die above

B. force of friction

C. force of cohesion

D. force of diffusion

E. force of adhesion

149. The bulk modulus of elasticity___________________?
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A. has the dimensions of 1/pressure

B. increases with pressure

C. is large when fluid is more compressible

D. is independent of pressure and viscosity

E. is directly proportional to flow

150. The normal stress in a fluid will be constant in all directions at a point only if__________________________?
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A. it has zero viscosity

B. it is frictionless

C. it is incompressible

D. it is at rest

E. it has uniform viscosity

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

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