[amp_mcq option1=”5 mm” option2=”10 mm” option3=”20 mm” option4=”30 mm” correct=”option1″]
The correct answer is A. 5 mm.
Capillary rise is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity. The height to which a liquid will rise in a narrow tube is called the capillary rise.
The capillary rise of a liquid in a tube is a result of the surface tension of the liquid. Surface tension is the tendency of a liquid surface to contract into the smallest possible area. This is due to the cohesive forces between the molecules of the liquid.
The higher the surface tension of a liquid, the greater the capillary rise. Water has a high surface tension, which is why it can rise up a narrow tube.
The capillary rise of water in a clean glass tube of 1 mm bore is approximately 5 mm. This is because the surface tension of water is strong enough to overcome the force of gravity and pull the water up the tube.
The other options are incorrect because they are too high. The capillary rise of water in a clean glass tube of 1 mm bore is not as high as 10 mm, 20 mm, or 30 mm.