!: (a) 20 cm: 80

10. Some mercury is poured into a capillary tube of

uniform bore and one end closed. When the tube

is held horizontally, mercury column has a length

of 4 cm and air enclosed in the closed end has a

length of 10 cm. If the tube is now held vertically,

with open end upwards, the length of the air

column will be (take atmospheric pressure at the

Tale place of experiment to be 760 mm)

(a) 10.5 cm . (6) 8.5 cm ",JI

(c) 9.0 cm mati (d) 9.5 cm 0

THE LENGTH OF THE AIR COLUMN IS 9.5 CM

Explanation:

Taking the atmospheric pressure to be 760 mmHg;

When the capillary tube is held horizontally, the pressure of the tube is 760 mmHg

when the capillary tube is held vertically, the pressure increases by 4 cm = 40 mm

The new pressure of the tube is hence, 760 + 40 mmHg = 800 mmHg

Using the pressure forlmula;

P1 V1 = P2 V2

P1 A1 L1 = P2 A2 L2

where A1 and A2 is the area of the capillary tube and it is equal, it cancels out.

P1 l1 = P2 l2

l2 = P1 l1 / P2

l2 = 760 * 10 / 800

l2 = 9.5 cm

The length of the air in the tube is 9.5 cm.

yes definetly because you are using energy

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .