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# the capillary rise at 20°c in a clean glass tube of 1 mm bore containing water is approximately

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### Mohammed

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## [Solved] The capillary rise at 20° C in a clean glass tube of 1 m

Concept: Capillarity:  If a tube of the very narrow bore (called capillary) is dipped in a liquid, it is found that the liquid in the&nb

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## The capillary rise at 20° C in a clean glass tube of 1 mm diameter containing water is approximately

15 mm 50 mm 20 mm 30 mm

Option 4 : 30 mm

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## Detailed Solution

Concept:

Capillarity:

If a tube of the very narrow bore (called capillary) is dipped in a liquid, it is found that the liquid in the capillary either ascends or descends relative to the surrounding liquid. This phenomenon is called capillarity.

The root cause of capillarity is the difference in pressures on two sides of the (concave and convex) curved surfaces of the liquid.

The capillary rise is given as:

σθ ρ

h = 4 × σ × cosθρ × g × d

Where h = rise of the liquid, σ = surface tension, θ = angle subtended by the liquid surface, ρ = density of the liquid, and d = diameter of the capillary pipe.

Calculation:Given:

At 20°C surface tension (σ) of water (contact with air) = 0.0736 N/m, d = 10-3 m, and in a clan glass tube the angle subtended by water surface (θ) = 00.

The capillary rise is given as:

σθ ρ

h = 4 × σ × cosθρ × g × d

h=4 × 0.0736 × cos009.81 × 103 × 10−3

h = 0.030 m = 30 mm

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स्रोत : testbook.com

## The capillary rise at 20 C in a clean glass tube

The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately a) 5 mm b) 10 mm c) 20 mm d) 30 mm

Examveda

## The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately

A. 5 mm B. 10 mm C. 20 mm D. 30 mm

## Join The Discussion

Join The Discussion Comments ( 5 )

Atif Muneer : 11 months ago 30 Mannu Maurya : 1 year ago

Option d is correct.

Using formula h= 4sigma cos(\$) /(¶gd)

YASHVIR YADAV : 3 years ago well,

formula for raise in hight is

h=((4*surface tension*cos(angle))/(density*9.81*diameter))

from table at 20 degree c

tension=73*10^-3

on substitute u get 29.736mm which is equal to 30mm

YASHVIR YADAV : 3 years ago well,

formula for raise in hight is

h=((4*surface tension*cos(angle))/(density*9.81*diameter))

Badal Merci : 4 years ago Solution??

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स्रोत : www.examveda.com

## The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately

The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately (a) 1 mm (b) 5 mm (c) 10 mm (d) 20 mm (e) 30 mm...

## The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately

Thread starter Dnyan Deshmukh Start date Jan 21, 2018

### Dnyan Deshmukh

Staff memberThe capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately

Pune Jan 21, 2018 #1 (a) 1 mm (b) 5 mm (c) 10 mm (d) 20 mm (e) 30 mm.

(e) 30 mm Reactions:

sanusingh27081 and Sumit Civil

### Newbie

Lucknow Jun 20, 2018 #2

30 is my answer for this question .....

Because it cannot be any other

Hence all the abswers are wrong and 30 is the answer 30 will be correct because no one will be correct because the rate of change of momentum of a body is directly proportional to net external force applied on it and the change takes place in the direction of applied force understanding any external force applied on it and answer 30 is correct

### Newbie

tripura Jul 25, 2018 #3

capillries rise,H= [email protected]/pgd

sigma for these one is .76

@ will be 0 p=1000 g=9.81 d=0.001m ans is 30

### Newbie

Vellore Oct 24, 2018 #4

Dnyan Deshmukh said:

The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately

(a) 1 mm (b) 5 mm (c) 10 mm (d) 20 mm (e) 30 mm. Click to expand...

(e) 30 mm

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