Final answer:
Water appeared on the inside of the glass test tube due to capillary action caused by adhesive forces being greater than cohesive forces.
Step-by-step explanation:
Water appeared on the inside of the glass test tube due to capillary action. Capillary action is caused by the adhesive forces between the water molecules and the internal surface of the glass tube being greater than the cohesive forces between the water molecules themselves.
This adhesive force allows the water molecules to climb up the walls of the glass tube, forming a meniscus or a concave surface at the top. This phenomenon is driven by intermolecular forces and surface tension.
Capillary action is commonly observed in narrow glass tubes, as the combination of adhesive and cohesive forces allows liquids to defy gravity and rise up in the tube.