The statement that heat cannot flow by itself from a body at a lower temperature to a body at a higher temperature, is known as

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Q: 77 (NDA-II/2017)
The statement that ‘heat cannot flow by itself from a body at a lower temperature to a body at a higher temperature’, is known as

question_subject: 

Polity

question_exam: 

NDA-II

stats: 

0,3,8,7,0,3,1

keywords: 

{'thermodynamics': [0, 0, 0, 1], 'thermo djtiamics': [0, 0, 0, 1], 'higher temperature': [0, 0, 0, 3], 'lower temperature': [0, 0, 0, 3], 'third law': [0, 0, 0, 1], 'second law': [0, 0, 2, 6], 'zeroth law': [0, 0, 1, 1], 'first law': [0, 0, 1, 6], 'heat': [10, 3, 13, 46]}

The statement mentioned in the question is known as the second law of thermodynamics. The second law states that heat cannot flow spontaneously from a colder body to a hotter body. This law is based on the concept of entropy, which is a measure of the disorder or randomness in a system.

Option 1: The zeroth law of thermodynamics is not related to the statement in the question. The zeroth law states that if two bodies are in thermal equilibrium with a third body, then they are in thermal equilibrium with each other.

Option 2: The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, only transferred or converted from one form to another. This law does not address the statement in the question.

Option 4: The third law of thermodynamics states that as the temperature approaches absolute zero, the entropy of a perfect crystal approaches zero. It does not directly relate to the statement mentioned in the question.

Therefore, the correct answer is option 3, the second law of thermodynamics.