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Questions and Answers
What are primary standards in the hierarchy of physical measurement standards?
What are primary standards in the hierarchy of physical measurement standards?
- Standards used under carefully controlled laboratory conditions
- Standards based on fundamental physical constants
- Standards defined with reference to unique artifacts
- Master standards made to the highest metrological quality (correct)
What is the purpose of a standard in metrology?
What is the purpose of a standard in metrology?
- To define unique artifacts for legal basis of units of measure
- To establish a hierarchy of physical measurement standards
- To serve as the fundamental reference for comparing measuring devices (correct)
- To complicate and introduce confusion in measurements
How are modern measurements defined in relation to internationally standardized reference objects?
How are modern measurements defined in relation to internationally standardized reference objects?
- Using practical units of measure in terms of fundamental physical constants
- Based on historical definitions of length, volume, and mass
- Under carefully controlled laboratory conditions (correct)
- With reference to unique artifacts
What is the continuing trend in metrology regarding the definition of practical units of measure?
What is the continuing trend in metrology regarding the definition of practical units of measure?
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Why were historical standards for length, volume, and mass defined by many different authorities problematic?
Why were historical standards for length, volume, and mass defined by many different authorities problematic?
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