Engineering :: Fluid Mechanics and Solid Handling

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21.

Spherical shape of droplets of mercury is due to its

A.	high adhesion	B.	low vapour pressure
C.	high surface tension	D.	high density

22.

Surface tension of water in contact with air at 20?C is

A.	0.0731 1bf/ft	B.	0.0731 N/m
C.	0.0731 dyn/cm	D.	0.731 kgf/m

23.

Two capillary tubes of different diameter are dipped in water. The rise of water is

A.	greater in the tube of smaller diameter	B.	greater in the tube of larger diameter
C.	same in both tubes	D.	zero in both tubes

24.

A soap bubble of initial radius r is to be blown up. The surface tension of the soap film is ?. The surface energy needed to double the diameter of the bubble without change of temperature is

A.	4?2?	B.	12?2?
C.	24?2?	D.	16?2?

25.

Rain drops fall from a great height under gravity. Select the only correct statement from the following

A.	Their velocities go on increasing until they hit the earth with the same velocity	B.	Their velocities go on increasing as they hit the earth but final velocities of different drops are different
C.	They fall with a terminal velocity which is the same for every drop	D.	They fall with terminal velocities which are different for drops of different size.

26.

Kinematic viscosity has the dimensions

A.	M-1L-1T-1	B.	L2T-1
C.	L-2T	D.	MLT-2

27.

The absolute viscosity of a fluid is a property which

A.	is a function of the motion of the fluid	B.	is independent of pressure and temperature
C.	is a function of the shear stress in the fluid.

28.

Which of the following is most viscous fluid?

A.	Water	B.	Glycerine
C.	Coal tar	D.	athyl alcohol.

29.

The SI unit of dynamic viscosity is

A.	N.s/m2	B.	N/m.s
C.	m2/s	D.	kg.s/m2

30.

Stoke (St) is the unit of kinematic viscosity and one stoke is equal to

A.	1 m2/s	B.	1 ft2/s
C.	1 cm2/s	D.	1 mm2/s