ISRO Mechanical & Aerospace 2008 - Question 29

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Topic: Metrology

Standards to be used for reference purposes in laboratories and workshops are termed as

  • A. Primary standards
  • B. Secondary standards
  • C. Tertiary standards
  • D. Working standards

Answer: C. Tertiary standards

Explanation: Tertiary standards are the reference standards employed by NPL and are the first standards to be used for reference in laboratories and workshops.

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