Law of conservation of energy is also known as :

Question

Accepted Answer

The Law of Conservation of Energy is correctly identified as the First Law of Thermodynamics, which is Option 3. This law states that energy cannot be created or destroyed in an isolated system; it can only be transformed from one form to another. The total energy of an isolated system remains constant over time. This principle is fundamental to the study of thermodynamics and underpins many scientific and engineering applications.

Now, let's explain why the other options are incorrect:

1. **Third Law of Thermodynamics**: This law is not related to the conservation of energy. Instead, it states that as the temperature of a system approaches absolute zero, the entropy of the system approaches a minimum value. It deals with the behavior of systems at very low temperatures, not the conservation of energy.

2. **Second Law of Motion**: This is one of Newton's laws of motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. It is not related to energy conservation but rather to the dynamics of motion.

3. **First Law of Lever**: This is a principle related to mechanics, specifically the operation of levers. It states that the effort multiplied by the distance from the fulcrum is equal to the load multiplied by its distance from the fulcrum. This is a principle of mechanical advantage, not energy conservation.

In summary, the First Law of Thermodynamics is the correct identification of the Law of Conservation of Energy, as it directly addresses the principle that energy in an isolated system remains constant, merely changing forms.