hydraulics and fluid mechanics MCQs – Page 6

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

hydraulics and fluid mechanics Mcqs
101. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will__________________?
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A. increase/decrease depending on depth of immersion

B. decrease

C. unpredictable

D. remain same

E. increase

102. The upper surface of a weir over which water flows is known is________________?
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A. sill

B. contracta

C. weir top

D. nappe

E. crest

103. Operation of McLeod gauge used for low pressure measurement is based on the principle of_____________________?
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A. gas law

B. Charles law

C. McLeods law

D. Boyles law

E. Pascals law

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

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

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

D. Local atmospheric pressure is always below standard atmospheric pressure

E. Local atmospheric pressure depends upon elevation of locality only

105. A large Roynold number is indication of_________________?
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A. highly turbulent flow

B. steady flow

C. laminar flow

D. turbulent flow

E. smooth and streamline flow

106. Dynamic viscosity of most of the liquids with rise in temperature____________________?
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A. remains unaffected

B. decreases

C. unpredictable

D. none of the above

E. increases

107. A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is__________________?
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A. 0.83

B. 0.6

C. 0.3

D. 0.4

E. none of the above

108. Cavitation is caused by___________________?
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A. low pressure

B. high velocity

C. high pressure

D. weak material

E. low viscosity

109. If the surface of liquid is convex, men_________________?
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A. cohesion pressure is increased

B. cohesion pressure is decreased

C. there is no cohesion pressure

D. none of the above

E. cohesion pressure is negligible

110. Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be ___________________?
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A. 4000 kg

B. 16000 kg

C. 1000 kg

D. 2000 kg

E. 8000 kg

111. Froude number is significant in____________________?
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A. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

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

C. all of the above

D. supersonics, as with projectile and jet propulsion

E. none of the above

112. Gradually varied flow is____________________?
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A. true one-dimensional

B. steady uniform

C. steady non-uniform

D. non-steady uniform

E. non-steady non-uniform

113. Choose the wrong statement?
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A. fluids are capable of flowing

B. fluids conform to the shape of the con-taining vessels

C. when in equilibrium, fluids can sustain shear forces

D. when in equilibrium, fluids cannot sustain tangential forces

E. fluids have some degree of compressibility and offer little resistance to form

114. Liquids transmit pressure equally in all the directions. This is according to_________________?
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A. Chezys equation

B. Boyles law

C. Newtons formula

D. Pascals law

E. Archimedes principle

115. The center of gravity of the volume of the liquid displaced by an immersed body is called________________?
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A. none of the above

B. center of gravity

C. center of buoyancy

D. center of pressure

E. meta-center

116. Dynamic viscosity of most of the gases with rise in temperature___________________?
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A. unpredictable

B. none of the above

C. increases

D. decreases

E. remains unaffected

117. Choose the wrong statement________________?
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A. Viscosity is expressed as poise, stoke, or saybolt seconds

B. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force

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

B. minimum

C. unpredictable

D. maximum

E. zero
119. During the opening of a valve in a pipe line, the flow is___________________?
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A. unsteady

B. free vortex type

C. laminar

D. steady

E. uniform

120. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm. The pressure at 2.5 m below the oil surface will be ___________________?
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A. 2 meters of water column

B. 4 m of water column

C. 3.5 meters of water column

D. none of the above

E. 3 meters of water column