57. The resultant upward pressure of the fluid on an immersed body is called
A.Upthrust
B.Buoyancy
C.Centre of pressure
D.All the above are correct

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58. The conditions for the stable equilibrium of a floating body are
A.The meta-centre should lie above the centre of gravity
B.The centre of buoyancy and the centre of gravity must lie on the same vertical line
C.A righting couple should be formed
D.All the above are correct

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59. Poise is the unit of
A.Surface tension (b) capillarity
B.(c) viscosity
C.(d) shear stress in fluids
D.(e) buoyancy.

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60. Metacentric height is given as the distance between
A.The centre of gravity of the body and the metacentre
B.The centre of gravity of the body and the centre of buoyancy
C.The centre of gravity of the body and the centre of pressure
D.Centre of buoyancy and metacentre

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61. The buoyancy depends on
A.Mass of liquid displaced
B.Viscosity of the liquid
C.Pressure of the liquid displaced
D.Depth of immersion

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62. The centre of gravity of the volume of the liquid displaced by an immersed body is called
A.Mem-centre
B.Centre of pressure
C.Centre of buoyancy
D.Centre of gravity

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63. A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury?
A.The metal piece will simply float over the mercury
B.The metal piece will be immersed in mercury by half
C.Whole of the metal piece will be immersed with its top surface just at mercury level
D.Metal piece will sink to the bottom

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