Question

Surface tension of liquids is:

• A. An electromagnetic force
• B. A weak nuclear force
• C. A viscous force
• D. A magnetic force

Hint:

Surface tension always originates from intermolecular cohesive forces, which are electromagnetic in nature.

Answer 1

The Correct Option is A

Step 1: Molecular basis of surface tension.
Surface tension stems from cohesive intermolecular attractions within the liquid.

Step 2: Fundamental force type.
These cohesive forces arise from electromagnetic interactions between charged particles (electrons and nuclei).

Step 3: Excluding other forces.
Weak nuclear forces act on subatomic scales; viscous forces resist flow; magnetic forces are not the primary cohesive agent.

Step 4: Physical interpretation.
Surface tension is a macroscopic manifestation of electromagnetic molecular cohesion.

Step 5: Conclusion.
Hence, surface tension is fundamentally an electromagnetic force.