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1) The peoperty by virtue of which a liquid opposes relative motion between its different layers is called_________________? a. surface tension b. co-efficient of viscosity c. viscosity d. osmosis e. cohesion
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2) The units of dynamic or absolute viscosity are_______________? a. metres2 per sec b. kg sec/meter c. newton-sec per meter d. newton-sec2 per meter e. none of the above
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3) The rise or depression of liquid in a tube due to surface tension wim increase in size of tube will_______________? a. increase b. remain unaffected c. may increase or decrease depending on the characteristics of liquid d. decrease e. unpredictable
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4) Capillary action is due to the__________________? a. surface tension b. cohesion of the liquid c. adhesion of the liquid molecules and the molecules on the surface of a solid d. all of the above e. none of the above
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5) Liquids transmit pressure equally in all the directions. This is according to_________________? a. Boyle’s law b. Archimedes principle c. Pascal’s law d. Newton’s formula e. Chezy’s equation
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6) The continuity equation is connected with_______________? a. viscous/unviscous fluids b. compressibility of fluids c. conservation of mass d. steady/unsteady flow e. open channel/pipe flow
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7) The process of diffusion of one liquid into the other through a semi-permeable membrane is called _______________? a. viscosity b. osmosis c. surface tension d. cohesion e. diffusivity
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8) The vapour pressure over the concave surface is__________________? a. less man the vapour pressure over the plane surface b. equal to the vapour pressure over the plane surface c. greater than the vapour pressure over the plane surface d. zero e. none of the above
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9) The difference of pressure between the inside and outside of a liquid drop is_____________? a. p = Txr b. p = T/r c. p = T/2r d. p = 2T/r e. none of the above
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10) The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately_______________? a. 1 mm b. 5 mm c. 10 mm d. 20 mm e. 30 mm
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11) Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the______________? a. force of adhesion b. force of cohesion c. force of friction d. force of diffusion e. none of die above
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12) Surface energy per unit area of a surface is numerically equal to ___________________? a. atmospheric pressure b. surface tension c. force of adhesion d. force of cohesion e. viscosity
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13) The vapour pressure over the concave surface is________________? a. less man the vapour pressure over the plane surface b. equal to the vapour pressure over the plane surface c. greater than the vapour pressure over the plane surface d. zero e. none of the above
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14) To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than_______________? a. 2.4 m above the hydraulic gradient b. 6.4 m above the hydraulic gradient c. 10.0 m above the hydraulic gradient d. 5.0 above the hydraulic gradient e. none of the above
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15) The difference of pressure between the inside and outside of a liquid drop is________________? a. p = Txr b. p = T/r c. p = T/2r d. p = 2T/r e. none of the above
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16) The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately____________________? a. 1 mm b. 5 mm c. 10 mm d. 20 mm e. 30 mm
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17) Surface energy per unit area of a surface is numerically equal to___________________? a. atmospheric pressure b. surface tension c. force of adhesion d. force of cohesion e. viscosity
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18) Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the_______________? a. force of adhesion b. force of cohesion c. force of friction d. force of diffusion e. none of die above
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19) The atmospheric pressure with rise in altitude decreases____________________? a. linearly b. first slowly and then steeply c. first steeply and then gradually d. unpredictable e. none of the above
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20) An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of_________________? a. 1 b. 1.2 c. 0.8 d. 0.75 e. 1.25
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