A liquid rises to a height of 7 . 0 cm in a capillary tube of radius 0 . 1 mm . The density of the liquid is 0 . 8 × 10 3 kg m - 3 . If the angle of contact between the liquid and the surface of the tube be zero, calculate the surface tension of the liquid. Take g = 10 m s - 2 .

Given: Height of liquid column = 7 . 0 cm = 9 × 10 - 2 m The radius of Tube = 0 . 1 mm = 0 . 1 × 10 - 3 m . Angle of contact = 0 ° g = 10 m / s 2 Density of liquid = 0 . 8 × 10 - 3 kg / m 3 To find: Surface tension of Liquid Solution: The surface Tension, T = hrρg 2 cos θ T = 7 . 0 × 10 - 2 × 0 . 1 × 10 - 3 × 0 . 8 × 10 - 3 × 10 2 × cos 0 T = 2 . 8 × 10 - 6 N / m .

A liquid rises to a height of 7 . 0 cm in a capillary tube of radius 0 . 1 mm . The density of the liquid is 0 . 8 × 10 3 kg m - 3 . If the angle of contact between the liquid and the surface of the tube be zero, calculate the surface tension of the liquid. Take g = 10 m s - 2 .

Given: Height of liquid column = 7 . 0 cm = 9 × 10 - 2 m The radius of Tube = 0 . 1 mm = 0 . 1 × 10 - 3 m . Angle of contact = 0 ° g = 10 m / s 2 Density of liquid = 0 . 8 × 10 - 3 kg / m 3 To find: Surface tension of Liquid Solution: The surface Tension, T = hrρg 2 cos θ T = 7 . 0 × 10 - 2 × 0 . 1 × 10 - 3 × 0 . 8 × 10 - 3 × 10 2 × cos 0 T = 2 . 8 × 10 - 6 N / m .

MEDIUM

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IMPORTANT

Earn 100

A liquid rises to a height of $7.0 cm$ in a capillary tube of radius $0.1 mm$ . The density of the liquid is $0.8 \times 10^{3} kg m^{- 3}$ . If the angle of contact between the liquid and the surface of the tube be zero, calculate the surface tension of the liquid. Take $g = 10 m s^{- 2}$ .

Important Questions on Surface Tension

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>NUMERICALS>Q 20

Water rises up in a glass capillary up to a height of

9.0 cm

,,$ while mercury falls down by

3.4 cm

in the same capillary. Assume angles of contact for water-glass and mercury-glass

0 °

and

135 °

respectively. Determine the ratio of surface tensions of mercury and water

(\cos 135 ° = - 0.71)

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>NUMERICALS>Q 21

Water rises up to

2.0 cm

in a capillary tube of length

20.0 cm

held vertically. If the capillary is bent by

30 °

from this vertical position, find the length of liquid risen in it.

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>NUMERICALS>Q 22

A capillary tube of the radius

0.4 mm

is dipped vertically in the water. Find up to what height the water will rise in the capillary. If the capillary is inclined at an angle of

60 °

with the vertical, how much length of the capillary is occupied by water? The surface tension of water is

7.0 \times 10^{- 2} {Nm}^{- 1}

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>NUMERICALS>Q 23

Water rises in a capillary up to a height of

8.0 cm

. If the capillary is inclined at an angle of

45 °

with the vertical, then determine the vertical height of water. How much length of the capillary will be occupied by water? If the length of the capillary is reduced to

4.0 cm

and it is held vertically in the water, then what will be the position of water?

EASY

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 1

Kerosine oil rises up in a wick of lantern because of _____.

EASY

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 2

An iron needle floats on the surface of water. This phenomenon is attributed to :

EASY

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 3

A square frame of wire of side $l$ is dipped in a liquid of surface tension

T

. On taking out just above the liquid surface, a membrane is formed on the frame. The force acting on the frame will be :

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 4

A ring is cut from a platinum tube of

8.5 cm

internal

8.7 cm

external diameter. It is supported horizontally from a pan of a balance so that it comes in contact with water in a glass vessel. If an extra

3.97 gram

weight is required to pull it away from water, the surface tension of water is :

A liquid rises to a height of 7.0 cm in a capillary tube of radius 0.1 mm. The density of the liquid is 0.8×103 kg m-3. If the angle of contact between the liquid and the surface of the tube be zero, calculate the surface tension of the liquid. Take g=10 m s-2.

Important Questions on Surface Tension

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A liquid rises to a height of $7.0 cm$ in a capillary tube of radius $0.1 mm$ . The density of the liquid is $0.8 \times 10^{3} kg m^{- 3}$ . If the angle of contact between the liquid and the surface of the tube be zero, calculate the surface tension of the liquid. Take $g = 10 m s^{- 2}$ .