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61.

Assumming idial gas behavior calculate the number of cubic feet of carbon dioxide gas at 68?F and 2 atm pressure which may be obtained from 50 lbs of dry ice

A.	1.14	B.	28.2
C.	219	D.	344

62.

Mercury is used in barometers due to

A.	its very low vapour pressure	B.	its high density
C.	its low compressibility	D.	negligible capillary effect

63.

Vapour pressure of a liquid is due to

A.	the existence of free surface	B.	the fluid pressure
C.	the pressure of air above the free surface	D.	the molecules of liquid which hang over the free surface

64.

The vapour pressure of water at 100?C is

A.	13.6 cm of Hg	B.	100 cm of Hg
C.	76 cm of Hg	D.	100 N/cm2

65.

The vapour pressure of liquid

A.	remains unaffected with change in temperature	B.	decreases with increase in temperature
C.	increases with increase in temperature	D.	increases linearly with increase in temperature.

66.

The problems of fluid statics are influenced by

A.	frictional and surface tension forces	B.	gravity and surface tension forces
C.	gravity and pressure forces	D.	frictional and pressure forces

67.

Select the correct statement for the hydrostatic pressure variation with depth in an unaccelerated incompressible fluid in a constant gravitational field

A.	It increases linearly with the increase in depth	B.	It decreases with the increase in depth
C.	It remains constant with the change in depth	D.	It increases exponentially with the increase in depth

68.

The hydrostatic equation of pressure variation in an incompressible fluid.

A.	P = p/h	B.	P = ?/h
C.	P = ph	D.	P = ?h where ? = specific weight

69.

In an isothermal atmosphere the pressure

A.	decreases linearly with elevation	B.	decreases exponentially with elevation
C.	remains constant with change in elevation	D.	and density remain constant

70.

How deep can a diver descend in ocean water (?=64 lbf/ft3) without damaging his watch which willwithstand an absolute pressure of 80 lbf/in2?

A.	146.9 ft	B.	180 ft
C.	1.02 ft	D.	1.25 ft