'Absolute zero' refers to ______.

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NTPC CBT 2 2016 Previous Paper 4 (Held On: 18 Jan 2017 Shift 1)
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  1. minus 273 °C
  2. minus 295 °C
  3. minus 300 °C
  4. minus 255 °C

Answer (Detailed Solution Below)

Option 1 : minus 273 °C
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Detailed Solution

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The correct answer is minus 273 degrees Celsius. 

Key Points

  • Absolute zero is the lowest possible temperature and is a point at which fundamental particles of nature have minimal vibration motion resulting in retaining only quantum mechanical zero-point energy induced particle motion. 
  • It is equivalent to 0 Kelvin or minus 273 degrees Celsius
  • It is practically impossible to reach out to the absolute zero temperature
  • It is the temperature at which the particles in the substance are essentially motionless which means that there is no way to slow them down further. 
  • Nothing can be colder than absolute zero on the Kelvin scale.
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