Question

The ability of an instrument to give the same output for repeated measurements under identical conditions is called:

• A. Accuracy
• B. Precision
• C. Sensitivity
• D. Linearity

Hint:

Logic Tip: A broken clock stuck at 12:00 is incredibly Precise (it always says 12:00 when you ask it), but it is only Accurate twice a day. Precision = Consistency. Accuracy = Correctness.

Answer 1

The Correct Option is B

Concept:
In process control and instrumentation, it is vital to distinguish between how "correct" a measurement is versus how "consistent" it is. These are defined by Accuracy and Precision.

Step 1: Accuracy is how close the instrument's reading is to the true, objective value. (Are you hitting the bullseye?)

Step 2: Precision is the degree of repeatability or reproducibility. If you measure the exact same thing ten times under the exact same conditions, do you get the exact same number every time? (Are your darts hitting the same spot, even if that spot is far from the bullseye?)

Step 3: * Sensitivity is how much the output changes for a small change in input. * Linearity means the output changes proportionally across the entire measurement range.

Step 4: The question specifically asks about getting the "same output for repeated measurements," which perfectly defines Precision.