Question

question 6
based on the article, which of these is true about surface tension?
a. its the reason a drop of water has a spherical shape.
b. its the cause of ice sinking to the bottom of a lake.
c. its the type of chemical bond that makes water freeze.
d. its the force that causes cracks and crevices in roads.

Explanation:

To determine the correct answer, we analyze each option:

• Option A: Surface tension is the tendency of liquid surfaces to shrink into the minimum surface area possible. A water drop forms a sphere because surface tension minimizes its surface area, so this is correct.
• Option B: Ice is less dense than liquid water, so it floats, not sinks. This is incorrect.
• Option C: Surface tension is a physical property related to intermolecular forces, not a chemical bond. Water freezes due to temperature and intermolecular forces (hydrogen bonding), not surface tension as a "type of chemical bond". This is incorrect.
• Option D: Cracks in roads are usually due to thermal expansion/contraction, freeze - thaw cycles, or mechanical stress, not surface tension. This is incorrect.

Answer:

A. It's the reason a drop of water has a spherical shape.