Discussion
Match the standard with its place in the hierarchy.
1. Primary 2. Secondary 3. Working
P. Used for routine calibration Q. Realises the unit from its definition R. Held in a laboratory and checked against the primary
Answer: A
Correct answer: 1-Q, 2-R, 3-P
The three levels form a chain of decreasing accuracy and increasing use. The primary standard realises the unit from its definition; the secondary is checked against it and held in the laboratory; and the working standard, checked in turn against the secondary, does the routine calibration. Each level protects the one above it from wear and handling.
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