Metrology

Question 1

Which of these is not a base SI unit

A. Meter
B. Newton
C. Kelvin
D. Ampere

Answer 1

B. Newton

The Newton is a derived unit, not a base SI unit. It is derived from the base units of mass length and time through the formula n equals kilogram* m/s squared the seven base SI units form the foundation for all other measurements

Question 2

What is the primary purpose of measurement traceability

A. Speed improvement
B. Equipment maintenance
C. Cost reduction
D. Quality assurance

Answer 2

D. Quality assurance

Measurement traceability ensures that measurements can be traced back to recognize standards. This system provides confidence and measurement, accuracy and consistency. It’s fundamental to Quality and international trade

Question 3

Which quantity is measured in candela

A. Light intensity
B. Temperature
C. Magnetic flux
D. Time and space

Answer 3

A. Light intensity

The candela measures luminous and sensity specifically the intensity of light in a given direction. It is one of the seven base SI units and is crucial for photometry and lighting standards

Question 4

What is the definition of 1 second and SI units

A. The duration of 9192631770. Of the radiation of cesium -133
B. The time taken by light to travel 0.000001 m in a vacuum
C. 1. Millionth of the time required for the Earth to complete one rotation
D. The time taken by light to travel 0.0001 in atmosphere

Answer 4

A. The duration of 9,192,631,770 periods of the radiation of cesium -133

One second is defined using the atomic clock frequency of cesium-133

Question 5

What is the base unit of electric current

A. Ampere
B. Volt
C. Ohm
D. Coulomb

Answer 5

A. Ampere

The SI unit for the electric current is the ampere which measures the flow of electric charge

Question 6

What is traceability and metrology

A. A method of recording all measured data inequality report
B. A system for predicting measurement errors
C. A chain of measurement comparisons to be internationally recognized standard
D. A process for digitizing physical measurements

Answer 6

C. A chain of measurement comparisons to an internationally recognized standard

Traceability ensures measurements are linked to a reference standard through a documented calibration hierarchy

Question 7

What is the primary purpose of a dead weight tester

A. Mass calibration
B. Pressure calibration
C. Temperature calibration
D. Force calibration

Answer 7

B. Pressure calibration

This is an off-topic question to help expand your thinking. Deadweight testers are primary standards for pressure calibration. They are used precisely calibrated weights and a known piston area to generate accurate pressure values for calibrating other pressure measuring instruments

Question 8

Which SI base unit is used to measure thermodynamic temperature

A. Celsius
B. Fahrenheit
C. Kelvin
D. Joule

Answer 8

C. Kelvin

Kelvin is the SI base unit for temperature and is based on absolute zero where molecular motion stops. It is used in scientific applications for precise temperature measurements

Question 9

What is the most accurate modern definition of 1 kg

A. It is defined based on the planck constant
B. It is the weight of 1 l. Of water at 20° c
C. It is based on the mass of a platinum iridium prototype stored in France
D. It is equivalent to 10,000 grains of sand

Answer 9

A. It is defined based on the planck constant

In 2019, the kilogram was redefined using the planck constant to ensure greater stability replacing the previous definition based on a physical prototype stored in France which was subject to mass variations

Question 10

Why must measurement instruments be regularly calibrated

A. To maintain accuracy and prevent measurement drift over time
B. To increase the number of readings that instrument can take
C. To eliminate human error in using the instrument
D. To increase the weight of the measuring instrument

Answer 10

A. To maintain accuracy and prevent measurement drift over time

Regular calibration ensures measurement instruments remain accurate and reliable by correcting deviations caused by environmental factors wear and aging