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11.

Surface tension has the dimensionss

A.	FL-2	B.	FL
C.	F-1 L3	D.	FL-1

12.

Capillary is due to

A.	adhesion	B.	cohesion
C.	both adhesion and cohesion	D.	neither adhesion nor cohesion

13.

The specific weight (? ) of a substance

A.	is its weight per unit volume	B.	is its mass per unit volume
C.	does not change with location	D.	is not a convenient property when dealing with fluid statics.

14.

In order to avoid a correction for the effect of capillary in manometers used for measuring pressure the diameter of the tube should he

A.	less than or equal to 3 mm	B.	more than 3 mm but less than 5 mm
C.	equal to 5 mm	D.	greater than or equal to 0.5 inch.

15.

Surface tension is due to

A.	cohesion only	B.	difference in magnitude between the forces due to adhesion and cohesion
C.	adhesion between liquid and solid molecules	D.	frictional forces

16.

Weight of liquid that rises in capillary tube is supported by

A.	the vertical component of force due to surface tension	B.	the local atmospheric pressure
C.	the viscous force	D.	he horizontal component of force due to surface tension.

17.

The capillary rise in water is on account of

A.	adhesion being greater than cohesion	B.	cohesion being greater than adhesion
C.	adhesion being equal to cohesion	D.	vapor pressure being small.

18.

The capillary rise or depression in a small diameter tube is

A.	directly proportional to the surface tension	B.	inversely proportional to the surface tension
C.	directly proportional to the diameter of the tube	D.	inversely proportional to the diameter of the tube

19.

The pressure within a soap bubble is

A.	less than the external pressure	B.	greater than the external pressure
C.	equal to the external pressure	D.	equal to the vapour pressure at the prevailing temperature.

20.

The capillary rise of water is maximum for glass tube of size

A.	10 mm	B.	5 mm
C.	3 mm	D.	1 mm