Question

A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of ............... .

• A. Conduction
• B. Convection
• C. Radiation
• D. Current

Answer 1

The correct option is A Conduction

Conduction occurs when two object at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature. Conduction is the movement of heat through a substance by the collision of molecules. At the place where the two object touch, the faster-moving molecules of the warmer object collide with the slower moving molecules of the cooler object. As they collide, the faster molecules give up some of their energy to the slower molecules. The slower molecules gain more thermal energy and collide with other molecules in the cooler object. This process continues until heat energy from the warmer object spreads throughout the cooler object, like the heat from the milk spreading throughout the metal spoon dipped in it. Hence, Option A is correct. The rest of the options do not express this condition, hence incorrect.