BASICS OF MEASUREMENTS

What Language does the word Metrology Originate from?

• Latin

• Greek

• Spanish

• Swahili

Metrology is a

• Science of technologies

• Science of measurement

• Science of Instrumentation

• Science of calculations

Define accuracy

• How close measurements are to each other.

• Where all variables are controlled.

• How close a measurement is to the true value.

• Where your experiment is repeatable.

Error of measurement =

• Precision – True value

• Measured value – Precision

• True value – Measured value

• None of the above

Parallex errors occur when...

• Different people measure at slightly different eye levels.

• Two lights run parallel to each other.

• The same person measures at the same eye level.

• Different people use different equipment to measure.

Headquarters of International Organization of Legal Metrology

• Geneva

• France

• spain

• London

What is the least count of a micrometer?

• 0.01mm

• 0.1mm

• 0.02mm

• 0.2mm

Using a voltmeter measured value is 24.3V, while its true value is 24V. What is the relative error of measurement?

• 1.2%

• 1.25%

• 1.3%

• 1.4%

The rate of displacement of the indicating device of the instrument with respect to a measured quantity

• Accuracy

• Precision

• sensitivity

• calibration

A worldwide system of measurements in which the units of base quantities were introduced is called

• prefixes

• an international system of units

• scientific names

• Nomenclature