Heat always flows from : 1 point From hotter body to colder body From colder body to hotter body In both the directions Never flows from one body to other
The Correct Answer and Explanation is:
Correct Answer:
From hotter body to colder body
Explanation
Heat is a form of energy that naturally transfers from one object to another due to a temperature difference. According to the Second Law of Thermodynamics, heat always flows from a body at a higher temperature to a body at a lower temperature. This process continues until thermal equilibrium is reached, meaning both bodies attain the same temperature.
This natural direction of heat flow can be observed in everyday life. For example, when you place a hot cup of tea on a table, the heat from the cup flows into the cooler surrounding air and the surface of the table. As a result, the tea gradually cools down. It never spontaneously becomes hotter unless external energy is added, such as by reheating it in a microwave.
The reason behind this behavior lies in the nature of thermal energy and molecular motion. In a hotter object, molecules move faster and have more kinetic energy. When this object comes into contact with a cooler one, the faster-moving molecules collide with the slower ones, transferring some of their energy. This process increases the energy of the cooler object and decreases that of the warmer one until both have equal average kinetic energy, which is experienced as equal temperature.
It is important to note that while heat transfer can be forced in the opposite direction using external work — such as in a refrigerator or an air conditioner — this does not happen naturally. In such cases, energy is used to move heat from a cooler region to a warmer one.
Thus, under normal, spontaneous conditions, heat flows from a hotter body to a colder body and never in the reverse direction on its own. This fundamental principle is a cornerstone of thermodynamics and governs many natural and engineered processes.
