1.0 Measurements And Their Errors

Question 1

Define the SI units

Answer 1

The globally agreed system of units

Question 2

Define SI prefixes

Answer 2

The globally agreed system to indicate the order of magnitude of a quantity

Question 3

Define random errors

Answer 3

Unexpected deviations in a measured quantity from it’s true value

Question 4

Define systematic errors

Answer 4

Constant deviations in a measured quantity from it’s true value

Question 5

Define precision

Answer 5

A measure of exactness or consistency in repeated readings

Question 6

Define accuracy

Answer 6

How close a reading is to it’s true value

Question 7

Define repeatability

Answer 7

Ability to produce consistent results when repeated

Question 8

Define reproducibility

Answer 8

Ability to obtain the same result when repeated using different equipment, different methods or by a different person

Question 9

Define resolution

Answer 9

The smallest change in a measurement an instrument can detect or display

Question 10

Define accuracy

Answer 10

How close a result is to it’s true value

Question 11

Define uncertainty

Answer 11

The measure of how confident you can be in a value

Question 12

Define orders of magnitude

Answer 12

The size of a value expressed as an order of ten