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The Kelvin scale is defined with its zero point at absolute zero (−273.15∘C), the theoretical minimum temperature where molecular activity ceases, as per the ideal gas law and thermodynamic principles (Section 10.4).
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
The Kelvin scale starts at absolute zero, the theoretical point where all molecular motion ceases, making it an absolute temperature scale. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Kelvin. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
Entropy of a perfect crystal at absolute zero is zero is the scientifically accurate answer to this question. Within the study of Thermodynamics, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Entropy of a perfect crystal at absolute zero is zero directly address what is being asked. Among the other options, The total entropy of the universe always increases, Heat energy flows from hot to cold, and Energy cannot be created or destroyed do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 1
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