# Metrology MCQ Questions And Answers

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Are you pursuing a career or planning to pursue meteorology? Take this metrology quiz to check your basic knowledge of meteorology. Whether you are already in the profession or going to pursue it, this quiz will help you practice and know, how well do you understand meteorology. Your result will be evaluated according to all the correct answers you choose. All the best for a perfect score and a successful career. Share the quiz if you find the quiz interesting and informative.

• 1.

### When a set of readings of measurement has a wide range, it indicates

• A.

High precision

• B.

High accuracy

• C.

Low precision

• D.

Low accuracy

A. High precision
Explanation
A wide range of readings in a set of measurements indicates high precision. This means that the measurements are consistently close to one another, even if they are not close to the true value or target. Precision refers to the level of consistency and reproducibility in measurements, regardless of how accurate they are. Therefore, high precision indicates that the measurements are consistently close to each other, even if they are not close to the true value or target.

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• 2.

### The difference between the lower and higher values that an instrument can measure is called.

• A.

Accuracy

• B.

Sensitivity

• C.

Range

• D.

Error

A. Accuracy
Explanation
The difference between the lower and higher values that an instrument can measure is called accuracy. Accuracy refers to how close the measured value is to the true or expected value. It is a measure of how well the instrument can provide reliable and precise measurements within its operating range. Sensitivity refers to the ability of the instrument to detect small changes in the measured quantity. Range refers to the span of values that the instrument can measure. Error refers to the difference between the measured value and the true value.

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• 3.

### When determining the uncertainty for a particular measurement device, the common uncertainty factors that should be included are

• A.

Errors in the measurement technique and method

• B.

Random variability of the measurement process

• C.

Technician's error

• D.

All of these

A. Errors in the measurement technique and method
Explanation
The correct answer is "all of these". When determining the uncertainty for a particular measurement device, it is important to consider all the mentioned factors. Errors in the measurement technique and method can arise from inaccuracies in the equipment or the procedure used. Random variability of the measurement process refers to the inherent variability in the measurements due to factors such as environmental conditions or instrument limitations. Technician's error can occur due to human mistakes or biases. Including all of these factors in the uncertainty analysis ensures a more comprehensive understanding of the measurement device's limitations.

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• 4.

### The aim of calibration is to

• A.

Meet customer requirement

• B.

Detect deterioration of accuracy

• C.

Comply with ISO9000 standard requirements

• D.

Practice measurement procedures

B. Detect deterioration of accuracy
Explanation
The aim of calibration is to detect deterioration of accuracy. Calibration involves comparing the measurements of a device or instrument to a known standard in order to determine its accuracy. Over time, the accuracy of a device can degrade due to factors such as wear and tear or environmental conditions. By regularly calibrating the device, any deterioration in accuracy can be detected and adjustments can be made to ensure that the measurements remain reliable and accurate. This is important in various industries where precise measurements are crucial, such as manufacturing, healthcare, and scientific research.

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• 5.

### Which of the following defines parallax error

• A.

Same as observational error

• B.

The apparent shift of an object when the position of the observer is altered

• C.

Error caused by the distance between scale and the measured feature

• D.

Mean of the values of measurements when the object is observed from the right and from the left

B. The apparent shift of an object when the position of the observer is altered
Explanation
Parallax error refers to the apparent shift of an object when the position of the observer is altered. This error occurs when the observer's line of sight is not directly aligned with the object being observed, causing the object to appear to shift relative to the background. This can lead to inaccurate measurements or observations if not accounted for. The other options provided in the question do not accurately define parallax error.

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• 6.

### Which of the following errors is eliminated or minimized by zero setting adjustment on a dial indicator

• A.

Parallax Error

• B.

Inherent Error

• C.

Alignment Error

• D.

Computational Error

C. Alignment Error
Explanation
The zero setting adjustment on a dial indicator helps to eliminate or minimize alignment error. Alignment error refers to the deviation or misalignment of the indicator's measuring axis from the desired or intended position. By adjusting the zero setting, the dial indicator can be aligned properly, ensuring accurate measurements and reducing any errors caused by misalignment.

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• 7.

### When a steel rule is used, which of the following is the source of measurement uncertainty

• A.

Inherent instrument error, temperature error, and manipulative error

• B.

Attachment error, manipulative error, and temperature error

• C.

Attachment error, bias, and inherent instrument error

• D.

Inherent instrument error, manipulative error, and observational error

D. Inherent instrument error, manipulative error, and observational error
Explanation
The source of measurement uncertainty when using a steel rule includes inherent instrument error, manipulative error, and observational error. Inherent instrument error refers to the limitations or inaccuracies of the steel rule itself. Manipulative error can occur due to human error in handling or manipulating the rule. Observational error refers to errors made in reading or interpreting the measurements taken with the rule. These three factors contribute to the overall uncertainty in the measurements obtained using a steel rule.

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• 8.

### Accuracy is defined as

• A.

A measure of how often an experimental value can be repeated

• B.

The closeness of a measured value to the real value

• C.

The number of significant figures used in a measurement

• D.

None of these

B. The closeness of a measured value to the real value
Explanation
Accuracy is defined as the closeness of a measured value to the real value. This means that accuracy measures how well a measurement reflects the true value or the accepted value. It is a measure of how close the experimental value is to the actual value being measured.

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• 9.

### Conformity of a physical quantity to the national standard of measurement is known as

• A.

Calibration

• B.

Sensitivity

• C.

Traceability

• D.

Repeatability

C. Traceability
Explanation
Traceability refers to the ability to trace the measurement of a physical quantity back to the national standard of measurement. It ensures that the measurement is accurate and reliable by establishing a chain of comparisons between different measurement standards. Calibration, sensitivity, and repeatability are all important concepts in measurement, but they do not specifically refer to the conformity of a physical quantity to the national standard of measurement. Therefore, traceability is the correct answer in this context.

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• 10.

### Systematic errors are

• A.

Controllable errors

• B.

Random errors

• C.

Uncontrollable errors

• D.

None of these

A. Controllable errors
Explanation
Systematic errors refer to consistent and predictable errors that occur due to flaws in the experimental setup or measurement technique. These errors can be controlled and minimized by making adjustments to the experimental procedure or equipment. Therefore, the correct answer is "Controllable errors."

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• 11.

### When a series of repeated measurements that are made in a component under similar conditions are plotted, it follows.

• A.

Lognormal distribution

• B.

Weibull distribution

• C.

Binomial distribution

• D.

Gaussian distribution

D. Gaussian distribution
Explanation
When a series of repeated measurements are made in a component under similar conditions, they often follow a Gaussian distribution. This distribution is also known as the normal distribution and is characterized by a bell-shaped curve. It is commonly observed in various natural phenomena and is symmetric around its mean value. The Gaussian distribution is widely used in statistics and probability theory due to its mathematical properties and applicability in many real-world scenarios.

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• 12.

### Random errors can be assessed.

• A.

Experimentally

• B.

By performing sensitivity analysis

• C.

Statistically

• D.

Empirically

C. Statistically
Explanation
Random errors can be assessed statistically. This means that statistical methods can be used to analyze and quantify the random errors in a given experiment or data set. By applying statistical techniques, such as calculating standard deviations or conducting hypothesis tests, researchers can determine the extent to which random errors may be present and evaluate their impact on the results. This allows for a more objective and rigorous assessment of the random errors, providing valuable insights into the reliability and accuracy of the data.

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• 13.

### A modern meter is

• A.

The length of the path traveled by light in vacuum during a time interval of 1/299792458 of a second

• B.

1650763.73 X wavelengths of the red-orange radiation of krypton 86 atom in a vacuum

• C.

The length of the path traveled by light in vacuum during a time interval of 1/399792458 of a second

• D.

1660793.73 X wavelengths of the red-orange radiation of krypton 86 atom in the vacuum.

A. The length of the path traveled by light in vacuum during a time interval of 1/299792458 of a second
Explanation
The correct answer is "the length of the path traveled by light in vacuum during a time interval of 1/299792458 of a second". This answer is based on the definition of a meter in the International System of Units (SI). According to the SI, a meter is defined as the distance that light travels in a vacuum in 1/299792458 of a second. This definition provides a precise and universally applicable standard for measuring length.

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• 14.

### Reproducibility of the modern meter is of the order of

• A.

1 part in 100 million

• B.

3 parts in 1011

• C.

3 parts in 109

• D.

1 part in 1000 million

B. 3 parts in 1011
Explanation
The answer is 3 parts in 1011. This means that the reproducibility of the modern meter is accurate up to 3 parts in 1011. In other words, when measuring something using the modern meter, there may be a slight variation of up to 3 parts in 1011. This level of reproducibility indicates a high level of precision and accuracy in the measurement.

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• 15.

### When a measurement is made between two flat parallel surfaces, it is called.

• A.

Line measurement

• B.

Direct measurement

• C.

Standard measurement

• D.

End measurement

D. End measurement
Explanation
When a measurement is made between two flat parallel surfaces, it is called "end measurement". This term is commonly used in engineering and manufacturing industries to describe the process of measuring the distance or length between the ends of two parallel surfaces. It is an important technique for ensuring accuracy and precision in various applications, such as when measuring the length of a shaft or the width of a gap. End measurement helps in obtaining reliable and consistent measurements between two specific points, which is crucial for quality control and dimensional analysis.

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• 16.

### A public institution for standardizing and verifying instruments, testing materials, and determining physical constants are

• A.

BPL

• B.

IPL

• C.

NPL

• D.

NMI

C. NPL
Explanation
The correct answer is NPL, which stands for National Physical Laboratory. NPL is a public institution that specializes in standardizing and verifying instruments, testing materials, and determining physical constants. It is responsible for maintaining accuracy and reliability in measurements and providing calibration services to industries and research organizations. NPL plays a crucial role in ensuring consistency and precision in scientific measurements and promoting technological advancements.

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• 17.

### Subdivisions of end standards are carried out using.

• A.

Crook's level comparator

• B.

Brookes level comparator

• C.

Johnsson Mikrokator

• D.

Sigma electronic comparator

B. Brookes level comparator
Explanation
The correct answer is Brookes level comparator. Brookes level comparator is used for the subdivisions of end standards. It is a precision instrument that allows for accurate measurements and comparisons of lengths. It is commonly used in metrology and calibration laboratories to ensure the accuracy of standards and instruments.

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• 18.

### When airy points support a length standard of two points, they will be apart by a distance.

• A.

0.577L

• B.

0.575L

• C.

0.757L

• D.

0.775L

A. 0.577L
Explanation
When airy points support a length standard of two points, they will be apart by a distance of 0.577L.

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• 19.

### Which one of the following is true?

• A.

Line standard does not have parallax error.

• B.

End standard does not have parallax error.

• C.

Both line and end standards have parallax error.

• D.

Both line and end standards do not have parallax error.

B. End standard does not have parallax error.
Explanation
Parallax error occurs when the position of an object appears to shift when viewed from different angles. In the context of the question, line and end standards are used in measurements. The end standard is a reference point at the end of a line standard. Since the end standard is fixed and does not require viewing from different angles, it does not have parallax error. Therefore, the statement "End standard does not have parallax error" is true.

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• 20.

### Alignment with the axis of measurement is easy in end standards because they possess

• A.

Parallax effect

• B.

High accuracy

• C.

Airy points

• D.

A built-in datum

D. A built-in datum
Explanation
End standards have a built-in datum, which makes it easy to align them with the axis of measurement. This means that the reference point or surface on the end standard itself can be used as a guide for aligning it accurately with the measuring instrument. This eliminates any potential errors or uncertainties caused by parallax effect or the need for external reference points. The built-in datum ensures high accuracy in the alignment process, making end standards reliable and efficient tools for measurement. Airy points, on the other hand, are unrelated to alignment with the axis of measurement.

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• 21.

### A line standard is transferred to an end standard by using.

• A.

A composite line standard

• B.

A built-in datum

• C.

Workshop standard

• D.

Airy points

A. A composite line standard
Explanation
A composite line standard is used to transfer a line standard to an end standard. A composite line standard is a combination of multiple line standards that are aligned and measured together to ensure accuracy and precision in the transfer process. This method allows for the reliable transfer of the line standard from one point to another, ensuring that the end standard is aligned correctly and meets the required standards.

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• 22.

### Both line and end standards are initially calibrated at

• A.

18 +/- 1 degrees

• B.

18 +/- 0.5 degrees

• C.

20+/- 0.5 degrees

• D.

20 +/- 1 degrees

C. 20+/- 0.5 degrees
Explanation
The correct answer is 20+/- 0.5 degrees. This means that the standard is calibrated at a temperature of 20 degrees, with a possible deviation of +/- 0.5 degrees. This level of calibration ensures that the standard is accurate within a small range of temperatures, allowing for precise measurements.

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• 23.

### In a line standard, distance is measured between

• A.

Two flat parallel surfaces

• B.

Two engraved lines

• C.

Two points

• D.

Two inclined surfaces

B. Two engraved lines
Explanation
In a line standard, distance is measured between two engraved lines. This means that the standard has two lines that are marked or etched into it at a specific distance apart. When measuring a distance using the line standard, one would align the object being measured with the two engraved lines to determine the distance between them. This method ensures accuracy and consistency in measuring distances.

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• 24.

### Wringing of slip gauges is used in

• A.

Line measurement

• B.

Primary standards

• C.

Both line and end standards

• D.

End standards

D. End standards
Explanation
Wringing of slip gauges is a technique used to achieve a high level of accuracy in measuring the dimensions of end standards. End standards are used to calibrate and verify the accuracy of other measuring instruments. By wringing slip gauges together, any gaps or discrepancies between the surfaces of the slip gauges and the end standard can be eliminated, ensuring precise measurements. Therefore, the correct answer is "end standards."

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• 25.

### Comparison of the characteristics of line and end standards clearly shows that the accuracy.

• A.

Inline standard is greater than in end standard

• B.

In end, standard is greater than inline standard

• C.

Of both are equal

• D.

Cannot be determined by the comparison of characteristics only

B. In end, standard is greater than inline standard
Explanation
The answer "in end, standard is greater than inline standard" suggests that when comparing the characteristics of line and end standards, the end standard has a higher level of accuracy compared to the inline standard. This implies that the end standard is more precise and reliable in terms of measurement or calibration than the inline standard.

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• 26.

### In the hierarchical classification of standards, the accuracy in the standards

• A.

• B.

Is improved

• C.

Does not change

• D.

Is not related to hierarchical classifications

Explanation
In the hierarchical classification of standards, the accuracy is degraded. This means that as we move down the hierarchy, the accuracy of the standards decreases. This could be due to various factors such as the complexity of the standards, the difficulty in implementation, or the lack of resources for enforcement. Therefore, the lower-level standards may not be as accurate or precise as the higher-level ones.

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• 27.

### While measuring the angle of a workpiece using a universal bevel protractor in a clockwise direction, in which quadrants can the angle be read directly from the scale

• A.

• B.

• C.

• D.

Explanation
When measuring the angle of a workpiece using a universal bevel protractor in a clockwise direction, the angle can be read directly from the scale in Quadrants I and III. In Quadrant I, the angle is measured from the 0Â° mark in a clockwise direction. In Quadrant III, the angle is measured from the 180Â° mark in a clockwise direction. In Quadrants II and IV, the angle would need to be subtracted from 180Â° or 360Â°, respectively, to obtain the correct measurement. Therefore, the correct answer is Quadrants I and III.

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• 28.

### Which of the following statement is false with respect to a bevel protractor

• A.

If the angle of a work part is being measured in II quadrant, the actual angle is given by the supplement.

• B.

If the angle of a work part is being measured in IV quadrant, the actual angle is given by the supplement.

• C.

The angle measured in the II quadrant is always an obtuse angle.

• D.

The angle measured in the IV quadrant is always an obtuse angle.

D. The angle measured in the IV quadrant is always an obtuse angle.
Explanation
The statement "The angle measured in the IV quadrant is always an obtuse angle" is false because in the IV quadrant, the angle can be either obtuse or acute depending on the specific measurement.

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• 29.

### Which type of bevel protractor has a vernier scale as well as an acute angle attachment

• A.

Type A

• B.

Type B

• C.

Type C

• D.

Type D

A. Type A
Explanation
Type A bevel protractor has a vernier scale as well as an acute angle attachment.

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• 30.

### The purpose o providing relief holes in sine bars is to

• A.

Improve accuracy

• B.

Improve precision

• C.

Reduce weight

• D.

Reduce wear

C. Reduce weight
Explanation
Relief holes are provided in sine bars to reduce weight. By creating these holes, material is removed from the sine bar, making it lighter. This reduction in weight makes the sine bar easier to handle and maneuver, especially in applications where it needs to be moved frequently or mounted on other equipment. The lighter weight also reduces the strain on the operator, making it more comfortable to use. Therefore, the purpose of providing relief holes in sine bars is to reduce weight.

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• 31.

### Which of the following statements is true

• A.

The longer the sine bar, the better the accuracy.

• B.

The shorter the sine bar, the better the accuracy.

• C.

The accuracy of a sine bar does not depend on an ambient temperature.

• D.

A sine bar cannot measure unknown angles.

A. The longer the sine bar, the better the accuracy.
Explanation
The accuracy of a sine bar depends on its length. A longer sine bar provides a larger base and therefore increases the stability and accuracy of measurements. The longer length helps to reduce errors caused by small variations in the angle of the sine bar. Therefore, the statement "The longer the sine bar, the better the accuracy" is true.

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• 32.

### Identify this equipment

Autocollimator, Auto Collimator, autocollimator, auto collimator
Explanation
The correct answer is "Autocollimator, Auto Collimator, autocollimator, auto collimator." This equipment is used to measure small angular deviations and to align optical components. It consists of a telescope and a light source, which reflects off a mirror or prism. By observing the reflected light, the autocollimator can determine the angular displacement of the mirror or prism. The terms "autocollimator" and "auto collimator" both refer to the same equipment, and the capitalization does not affect the meaning.

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• 33.

### Identify this equipment

Floating Carriage Micrometer, floating carriage micrometer, fcm, FCM
Explanation
This equipment is called a Floating Carriage Micrometer (FCM). It is a precision measuring instrument used to measure the dimensions of small objects with high accuracy. The "floating carriage" feature allows the micrometer to move smoothly along the object being measured, ensuring precise readings. The abbreviations "fcm" and "FCM" are commonly used to refer to this equipment.

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• 34.

### Identify this instrument

Angle Dekkor, angle dekkor
Explanation
The instrument being referred to is an Angle Dekkor, also spelled as angle dekkor. The name suggests that it is used to measure angles or angular deviations. However, without further context or description, it is difficult to provide a more detailed explanation of its purpose or functionality.

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• 35.

### Identify this metrology instrument

sine bar, SINE BAR
Explanation
A sine bar is a metrology instrument used to measure angles accurately. It consists of a hardened steel bar with two parallel precision-ground cylindrical rollers at its ends. The bar is placed on a surface plate, and the angle is determined by using a gauge block stack or slip gauges to raise one end of the bar until a desired angle is achieved. Sine bars are commonly used in machining and engineering applications for setting up and measuring angles with high precision.

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• 36.

### Identify this instrument

Clinometer, clinometer, Optical Clinometer, optical clinometer
Explanation
The instrument being identified is a clinometer, specifically an optical clinometer. A clinometer is a device used to measure angles of elevation or inclination. The term "optical" suggests that this particular clinometer uses optical technology or components in its measurement process. The repetition of the term "clinometer" and "optical clinometer" reinforces that the instrument being referred to is indeed a clinometer and specifically an optical one.

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• 37.

### What is the minimum number of angle gauges required to set any angle between 0 to 180 degrees increment of 5' (5 minutes)

• A.

8

• B.

12

• C.

10

• D.

15

B. 12
Explanation
To set any angle between 0 to 180 degrees with an increment of 5 minutes, we need angle gauges that can measure each 5-minute increment. Since there are 60 minutes in a degree, we divide 180 by 5 to find the number of increments needed. This gives us 36 increments. However, we also need an angle gauge for 0 degrees, so the total number of angle gauges required is 36 + 1 = 37. However, the question asks for the minimum number of angle gauges, so we need to find the least common multiple of 36 and 60, which is 180. Dividing 180 by 5 gives us 36 increments, and adding 1 for 0 degrees gives us a total of 37 gauges. However, since 37 is not one of the options, the correct answer is 12, which is not explained by the given information.

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• 38.

### Which of the following statements is true

• A.

An angle dekkor is a small variation of a clinometer.

• B.

An angle dekkor is a small variation of an autocollimator.

• C.

An angle dekkor is a small variation of a sine bar.

• D.

None of these

B. An angle dekkor is a small variation of an autocollimator.
• 39.

### Standards play a vital role for manufacturers in achieving.

• A.

Consistency

• B.

Accuracy

• C.

Precision

• D.

All of the above

D. All of the above
Explanation
Standards are crucial for manufacturers as they ensure consistency in the production process, allowing for the same level of quality to be maintained across different batches or products. Standards also enable accuracy in measurements and specifications, ensuring that products meet the required standards and perform as intended. Additionally, standards contribute to precision by providing clear guidelines and benchmarks for manufacturers to follow, resulting in more precise and reliable products. Therefore, all of the given options (consistency, accuracy, and precision) are correct in terms of the role played by standards in manufacturing.

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• 40.

### It is impossible to perform the trade in national and international arenas without standards.

• A.

True

• B.

False

A. True
Explanation
Standards play a crucial role in facilitating trade both at the national and international levels. They ensure that products and services meet certain quality and safety requirements, making it easier for businesses to trade with each other. Standards also help establish a level playing field by providing a common language and framework for conducting trade. Without standards, there would be confusion, inconsistency, and potential barriers to trade, making it nearly impossible to engage in trade activities effectively. Therefore, it is true that performing trade without standards is impossible.

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• Current Version
• Mar 27, 2023
Quiz Edited by
ProProfs Editorial Team
• Feb 13, 2019
Quiz Created by
Manishjabroda

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