#1
Which of the following is an example of a non-contact measurement tool?
Proximity sensor
ExplanationUtilizes electromagnetic fields to detect the presence or absence of an object without physical contact.
#2
Which of the following is a primary unit of measurement for mass in the International System of Units (SI)?
Kilogram
ExplanationFundamental unit for expressing mass, defined as the mass of the international prototype of the kilogram.
#3
Which of the following is a common unit for measuring luminous intensity?
Candela
ExplanationStandard unit for measuring the intensity of light emitted in a particular direction.
#4
Which of the following is a common unit for measuring electrical capacitance?
Farad
ExplanationUnit of electrical capacitance, representing one coulomb of charge per volt of potential difference.
#5
What is the primary function of a hydrometer in fluid density measurements?
Measure fluid density
ExplanationUtilized to determine the density of a liquid by measuring its buoyancy.
#6
What does the term 'resolution' refer to in measurement instruments?
The smallest detectable change in a quantity
ExplanationDefines the precision or smallest increment of measurement that an instrument can detect.
#7
In metrology, what does the acronym 'NIST' stand for?
National Institute of Standards and Technology
ExplanationGovernment agency responsible for promoting standards and technology in various fields.
#8
What is the purpose of a tachometer in measurement instruments?
Counting revolutions per minute (RPM)
ExplanationMeasures the rotational speed of a shaft or disk.
#9
In surveying, what does a theodolite measure?
Direction or angle
ExplanationInstrument used for measuring both horizontal and vertical angles in surveying.
#10
What is the primary purpose of a micrometer screw gauge in precision measurements?
Measure length
ExplanationUsed to measure very small distances with high precision.
#11
Which material is commonly used for making the standard reference bar for length measurement in interferometers?
Zerodur
ExplanationMaterial with extremely low thermal expansion coefficient, ideal for precision measurements.
#12
What type of gauge is often used for measuring the thickness of thin materials like films or foils?
Foil gauge
ExplanationDesigned specifically for accurately measuring the thickness of thin materials.
#13
In optics, what does the term 'Abbe number' represent?
Index of refraction
ExplanationMeasure of the dispersion of a material, influencing the quality of optical components.
#14
In geodetic measurements, what does the term 'GPS' stand for?
Global Positioning System
ExplanationSatellite-based navigation system providing location and time information anywhere on Earth.
#15
Which type of thermometer is based on the principle of expansion and contraction of a liquid with temperature changes?
Mercury thermometer
ExplanationTraditional thermometer utilizing mercury as the temperature-sensitive fluid.
#16
Which instrument is commonly used for measuring electrical resistance?
Ohmmeter
ExplanationSpecifically designed to measure electrical resistance in circuits.
#17
What is the purpose of a Vernier scale in measurement tools?
To improve accuracy in measurements
ExplanationProvides a means to make precise measurements by allowing interpolation between the divisions of the main scale.
#18
Which type of micrometer is specifically designed for measuring the thickness of objects like paper or sheet metal?
Thickness micrometer
ExplanationOptimized for accurately measuring the thickness of flat objects.
#19
What is the main function of a spectrophotometer?
Analyzing chemicals in a sample
ExplanationMeasures the amount of light absorbed by a substance to determine its concentration or composition.
#20
In electrical measurements, what does the term 'DMM' stand for?
Digital Multimeter
ExplanationInstrument for measuring multiple electrical parameters digitally.
#21
What is the purpose of a strain gauge in mechanical measurements?
Measure force or stress
ExplanationUsed to measure the strain or deformation in a material under stress.
#22
What is the primary function of an anemometer in meteorological measurements?
Measure wind speed
ExplanationInstrument used to determine the speed and direction of the wind.
#23
What is the primary purpose of a spectrophotometer in analytical chemistry?
Analyze color and absorbance
ExplanationUsed to measure the intensity of light transmitted through or reflected from a sample.
#24
Which instrument is commonly used for measuring the hardness of materials?
Durometer
ExplanationDevice employed to assess the hardness of materials, particularly polymers and rubbers.