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1) A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, then________________?
1. the ball will move to the front 2. the bubble will move to the front 3. the ball will move to the rear 4. the bubble will move to the rear Find out which of the above statements are correct ? a. (1) and (2) b. (1)and(4) c. (2) and (3) d. (3) and (4)
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2) Which of the following is an incorrect statement_______? a. Coefficient of contraction of a venturimeter is unity b. Flow nozzle is cheaper than venturimeter but has higher energy loss c. Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined d. None of the above statement is correct.
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3) A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is___________________? a. zero b. one-fourth its value when cylinder was full c. one-half its value when cylinder was full d. cannot be predicted from the given data
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4) When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies________________? a. linearly with radial distance b. as the square of the radial distance c. inversely as the square of the radial distance d. inversely as the radial distance
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5) The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as__________________? a. center of gravity b. center of buoyancy c. center of pressure d. metacentre
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6) The increase in meta centric height_________________?
1. increases stability 2. decreases stability 3. increases comfort for passengers 4. decreases comfort for passengers The correct answer is? a. (1) and (3) b. (1)and(iv) c. (2) and (3) d. (2) and (4)
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7) If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will________________? a. rise until its weight equals the buoyant force b. tend to move downward and it may finally sink c. float d. none of the above
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8) A floating body is said to be in a state of stable equilibrium_________________? a. when its metacentric height is zero b. when the metacentre is above the centre of gravity c. when the metacentre is below the centre of gravity d. only when its centre of gravity is below its centre of buoyancy
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9) A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of________________? a. 3.75 m b. 4.0 m c. 4.2m d. 4.5m
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10) The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is______________? a. at the centroid of the submerged area b. always above the centroid of the area c. always below the centroid of the area d. none of the above
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11) Newton’s law of viscosity relates________________? a. intensity of pressure and rate of angular deformation b. shear stress and rate of angular deformation c. shear stress, viscosity and temperature d. viscosity and rate of angular deformation
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12) The viscosity of a gas_______________? a. decreases with increase in temperature b. increases with increase in temperature c. is independent of temperature d. is independent of pressure for very high pressure intensities
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13) If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is__________________? a. 0.25 b. 0.50 c. 1.0 d. none of the above
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14) An ideal fluid is_______________? a. one which obeys Newton’s law of viscosity b. frictionless and incompressible c. very viscous d. frictionless and compressible
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15) Pascal-second is the unit of______________? a. pressure b. kinematic viscosity c. dynamic viscosity d. surface tension
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16) The unit of kinematic viscosity is_______________? a. gm/cm-sec2 b. dyne-sec/cm2 c. gm/cm2-sec d. cm2/sec
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17) Select the correct statement_.? a. The absolute roughness of a pipe de-creases with time b. A pipe becomes smooth after using for long time c. The friction factor decreases with time d. The absolute roughness increases with time
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