Question

Q.9) One end of a towel dips into a bucket
full of water and other end hangs over the
bucket. It is found that after some time the
towel becomes fully wet. It happens
O Because viscosity of water is hig.
O
Because of the capillary action of cotton
threads
O Because of gravitational force
O Because of evaporation of water​

Answer 1

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Answer 2

The towel becomes fully wet because of the capillary action of cotton threads.

• Capillary action is also referred to as capillarity or capillary motion or wicking.
• It is the flow of liquid spontaneously through either a porous material or a thin tube.
• This flow or movement does not occur due to the effect of gravity.
• Moreover, this is an action taking place against gravity.
• Capillary action occurs due to the liquid's cohesive force and because of the adhesive force existing between the material and the liquid.
• Therefore, in this case, it is the cohesive force existing in the water molecules and the adhesive force acting between the water and the cotton threads that causes this capillary action.