What is the error of measurement ?

What is the error of measurement ?
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In order to determine the value of a quantity in the laboratory, it is necessary to measure. Measurements are never accurate. There is a limit to the accuracy of all measurements. Even with sufficient caution, different values can be found when measuring the same amount at different times of the same tester or at the same time measuring different testers. There are basically four types of errors during measurement. Namely- 1. Mechanical error 2. Observation error 3. Random errors and 4. Recurrent or systemic error
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Related questions

Why does percentage error decrease as units of measurement increase?

Description : Why does percentage error decrease as units of measurement increase?

Last Answer : answer:Well you can think of it in the sense that the longer something you measure is, the less the error is of the whole length. It's an inverse proportional relationship if you look at the formula. For instance if you use ... So for the 20.0mm=0.5/20.0=0.0250 while for the 30.0mm=0.5/30.0=0.0167

What is the error and accuracy of measurement ?

Description : What is the error and accuracy of measurement ?

Last Answer : Error is a negative word and when we say "error in measurement", we think that the person who measured has made an error because he did not fulfill his responsibility properly. It's not that the ... test results can be given by knowing some common rules to find out the accuracy of the test results.

How many types of measurement error ?

Description : How many types of measurement error ?

Last Answer : 3 types of measurement error.

The radius of a sphere is 8 cm and 0.02 cm is the error in its measurement. Find the approximate error in its volume.

Description : The radius of a sphere is 8 cm and 0.02 cm is the error in its measurement. Find the approximate error in its volume.

Last Answer : The radius of a sphere is 8 cm and 0.02 cm is the error in its measurement. Find the approximate error in its volume.

Let x = [a^2b^2/c] be the physical quantity. If the percentage error in the measurement of physical quantities a, b and c is 2, 3 and 4

Description : Let x = [a^2b^2/c] be the physical quantity. If the percentage error in the measurement of physical quantities a, b and c is 2, 3 and 4

Last Answer : Let x = \([\frac{a^2b^2}{c}]\) be the physical quantity. If the percentage error in the measurement of physical ... 7% (B) 14% (C) 21% (D) 28%

In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively.

Description : In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively.

Last Answer : In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, ... % (C) (3/13) % (D) 16 %

Show that the percentage error in the measurement of resistance by a metre bridge is minimum when the null point is near about the centre of the wire.

Description : Show that the percentage error in the measurement of resistance by a metre bridge is minimum when the null point is near about the centre of the wire.

Last Answer : Show that the percentage error in the measurement of resistance by a metre bridge is minimum when the null point is ... B. 50 cm C. 80 cm D. 100 cm

What is the greatest possible error for each measurement. 953 mi?

Description : What is the greatest possible error for each measurement. 953 mi?

Last Answer : It is 0.5 mi.

Offsets are measured with an accuracy of 1 in 40. If the point on the paper from both sources of error (due to angular and measurement errors) is not to exceed 0.05 cm on a scale of 1 cm = 20 m, the maximum length of offset should be limited to (A) 14.14 m (B) 28.28 m (C) 200 m (D) None of these

Description : Offsets are measured with an accuracy of 1 in 40. If the point on the paper from both sources of error (due to angular and measurement errors) is not to exceed 0.05 cm on a scale of 1 cm = 20 m, the maximum length of ... should be limited to (A) 14.14 m (B) 28.28 m (C) 200 m (D) None of these

Last Answer : (B) 28.28 m

The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by (A) dQ/Q = (1/2) × (dH/H) (B) dQ/Q = (3/4) × (dH/H) (C) dQ/Q = (dH/H) (D) dQ/Q = (3/2) × (dH/H)

Description : The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by (A) dQ/Q = (1/2) × (dH/H) (B) dQ/Q = (3/4) × (dH/H) (C) dQ/Q = (dH/H) (D) dQ/Q = (3/2) × (dH/H)

Last Answer : Answer: Option D

The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by (A) dQ/Q = 3/2 × (dH/H) (B) dQ/Q = 2 × (dH/H) (C) dQ/Q = 5/2 × (dH/H) (D) dQ/Q = 3 × (dH/H)

Description : The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by (A) dQ/Q = 3/2 × (dH/H) (B) dQ/Q = 2 × (dH/H) (C) dQ/Q = 5/2 × (dH/H) (D) dQ/Q = 3 × (dH/H)

Last Answer : Answer: Option C

The absolute percentage error in the computed discharge over a rectangular weir corresponding to an absolute error of 1.5 % in the measurement of head over the sill of the weir would be : (a) 1.5 (b) 2.25 (c) 2.5 (d) 3.75

Description : The absolute percentage error in the computed discharge over a rectangular weir corresponding to an absolute error of 1.5 % in the measurement of head over the sill of the weir would be : (a) 1.5 (b) 2.25 (c) 2.5 (d) 3.75

Last Answer : (b) 2.25

Which of the following is NOT concept of measurement theory? a. Directness of measurement b. Reliability c. Feasibility d. Measurement error

Description : Which of the following is NOT concept of measurement theory? a. Directness of measurement b. Reliability c. Feasibility d. Measurement error

Last Answer : C

Which one of the following is consists of rules for assigning numbers to objects to represent quantities of attributes? a. Reliability b. Measurement c. Measurement error d. Validity

Description : Which one of the following is consists of rules for assigning numbers to objects to represent quantities of attributes? a. Reliability b. Measurement c. Measurement error d. Validity

Last Answer : b. Measurement

Which of the following is not an assumption underlying testing and measurement? a. Various approaches to measuring aspects of the same thing can be useful b. Error is rarely present in the measurement process c. Present-day behavior predicts future behavior d. Testing and assessment benefit society

Description : Which of the following is not an assumption underlying testing and measurement? a. Various approaches to measuring aspects of the same thing can be useful b. Error is rarely present in the measurement process c. Present-day behavior predicts future behavior d. Testing and assessment benefit society

Last Answer : b. Error is rarely present in the measurement process

Explain Static Error and Dynamic Error in measurement systems.

Description : Explain Static Error and Dynamic Error in measurement systems.

Last Answer : Definition of static error and dynamic error  Static error: It is the difference between the true value of a quantity not changing with time and the value indicated by the instrument  Dynamic ... changing with time and the value indicated by the instrument if no static error is assumed.

What is measurement error ?

Description : What is measurement error ?

Last Answer : Measurement error :- Measurement is the process of comparing unknown quantity with known or standard quantity. Error is the difference between ... by fluctuations in reading measurement apparatus. Random error show different result for same repeated measurement.

What is mean by error in electrical measurement and instrumentation?

Last Answer : Error is the difference between measured value and true value.

What are the common types of measurement errors ?

Description : What are the common types of measurement errors ?

Last Answer : There are usually three types of measurement errors.

" Measurement of mass inertia" - Explain ?

Description : " Measurement of mass inertia" - Explain ?

Last Answer : If you want to move two objects from a stationary state with two objects of two different masses, more effort will be required in case of heavy objects. Similarly, if two objects are moving, more effort will ... in the case of heavy objects. This is why it is said that mass is a measure of inertia.

What is the unit of measurement ?

Description : What is the unit of measurement ?

Last Answer : The unit of measure for which the standard is measured is called the unit of that sign.

What is the requirement of measurement in physics ?

Description : What is the requirement of measurement in physics ?

Last Answer : There is a great need for measurement in every field in physics. The purpose of physics is to express everyday events in a coherent mathematical formula. These formulas were later used by various ... on test results . For all the above purposes, the measurement of physical quantities is inevitable.

Measurement accuracy depends on what factors ?

Description : Measurement accuracy depends on what factors ?

Last Answer : The accuracy of the measurement depends on the following factors. 1. The device will not have any kind of mechanical defect , if there is a mechanical defect it will have to be diagnosed and ... the correct position to avoid parallax errors. 3. Avoid random errors and take average of more lessons.

What are the units of measurement and what are they ?

Description : What are the units of measurement and what are they ?

Last Answer : There are two types of unit of measurement . Namely- (1) basic unit and (2) compound unit or acquired unit.

What is the unit of measurement ?

Description : What is the unit of measurement ?

Last Answer : The unit of measurement by which something is measured by comparison.

What is measurement ?

Description : What is measurement ?

Last Answer : Measurement is the measurement of something.

What is the principle of heat measurement ?

Description : What is the principle of heat measurement ?

Last Answer : : Heat exchange occurs when multiple objects of different temperatures are exposed to heat. Objects at higher temperatures lose heat and objects at lower temperatures absorb heat. This acceptance ... conservation, objects at higher temperatures absorb the same heat as objects at lower temperatures.

'Parsec' is the unit measurement of - (1) Density of stars (2) Astronomical distance (3) Brightness of heavenly bodies (4) Orbital velocity of giant stars

Description : 'Parsec' is the unit measurement of - (1) Density of stars (2) Astronomical distance (3) Brightness of heavenly bodies (4) Orbital velocity of giant stars

Last Answer : (2) Astronomical distance Explanation: The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.

'Parsec' is the unit measurement of – (1) Density of stars (2) Astronomical distance (3) Brightness of heavenly bodies (4) Orbital velocity of giant stars

Description : 'Parsec' is the unit measurement of – (1) Density of stars (2) Astronomical distance (3) Brightness of heavenly bodies (4) Orbital velocity of giant stars

Last Answer : (2) Astronomical distance Explanation: Parsec is a unit of distance used in astronomy to measure large distances to objects outside our Solar System. It is equal to about 3.26 light years (3.086 x 1013 kilometres).

The unit of measurement of noise is – (1) Decibel (2) Hertz (3) Amplifier (4) Acoustics

Description : The unit of measurement of noise is – (1) Decibel (2) Hertz (3) Amplifier (4) Acoustics

Last Answer : (1) Decibel Explanation: The decibel (dB) is the unit used to measure the intensity of sound or noise level. It is given in terms of a logarithmic function of a ratio of power intensities. One ... one bel, named in honor of Alexander Graham Bell who was the inventor of the telephone and phonograph.

An instrument commonly used for the measurement of atmospheric pressure is known as A. Manometer B. Barometer C. Calorimeter D. Potentiometer

Description : An instrument commonly used for the measurement of atmospheric pressure is known as A. Manometer B. Barometer C. Calorimeter D. Potentiometer

Last Answer :  Barometer

Most appropriate instrument for measurement of internal and external diameter of a tube is A. vernier callipers B. micrometer screw gauge C. meter rule D. measuring tape

Description : Most appropriate instrument for measurement of internal and external diameter of a tube is A. vernier callipers B. micrometer screw gauge C. meter rule D. measuring tape

Last Answer : vernier callipers

The ability of an atom to absorb neutrons is its neutron capture cross section. The unit of measurement for neutron capture cross section is: w) the nucleus volume x) capture capacity y) resonance quotient z) barn

Description : The ability of an atom to absorb neutrons is its neutron capture cross section. The unit of measurement for neutron capture cross section is: w) the nucleus volume x) capture capacity y) resonance quotient z) barn

Last Answer : ANSWER: Z -- BARN

The unit of measurement of noise is (1) Decibel (2) Hertz (3) Amplifier (4) Acoustics

Description : The unit of measurement of noise is (1) Decibel (2) Hertz (3) Amplifier (4) Acoustics

Last Answer : Decibel

‘Parsec’ is the unit measurement of (1) Density of stars (2) Astronomical distance (3) Brightness of heavenly bodies (4) Orbital velocity of giant stars

Description : ‘Parsec’ is the unit measurement of (1) Density of stars (2) Astronomical distance (3) Brightness of heavenly bodies (4) Orbital velocity of giant stars

Last Answer : Astronomical distance

Explain why a systematic error can’t be corrected for by taking the mean of many readings.?

Description : Explain why a systematic error can’t be corrected for by taking the mean of many readings.?

Last Answer : I don't understand the relevance of the image to the question. However, your basic idea seems to be close to the correct idea. A systematic error is in contrast to random ... actual value should be. This is why scientists must account for their estimated error using various statistical tools

What is the expected value of random error ?

Description : What is the expected value of random error ?

Last Answer : The expected value of random error is 0

What is a random error ?

Description : What is a random error ?

Last Answer : When a constant quantity is measured several times, the error that causes the measured meaning to be inconsistent is called random error .

What is a recurring error ?

Description : What is a recurring error ?

Last Answer : If the error in measuring a quantity is always one-sided, that is, if it is positive then it is only positive or if it is negative then it is only negative, then such error is called repetitive error.

What is Level Error ?

Description : What is Level Error ?

Last Answer : Answer : Lessons are wrong if there is no induction of Nikti , scattering magnetic value instrument etc. This type of error is called level error. These devices have leveling screws underneath. The instrument is leveled with leveling screws using slirite level or woolen yarn.

What is the mechanical cause of recurring error ?

Description : What is the mechanical cause of recurring error ?

Last Answer : : If the design or marking of the measuring instrument is not correct then repeat error occurs when measuring in that instrument. The capillary tube inside such a mercury thermometer must be ... temperature is measured with this thermometer, it will be more or less than the actual temperature.

How can there be mechanical error in spherometer ?

Description : How can there be mechanical error in spherometer ?

Last Answer : : When the three legs of the spherometer and the screw-head touch a plane, the instrument has an error if the zero point of the circular scale does not match the zero point of the linear scale. This error is a mechanical error.

What is zero error ?

Description : What is zero error ?

Last Answer : Devices that have vernier scales or circular scales , such as slide calipers , screw-gauge. When the ends of the jaws or screws of these instruments are joined to each other, the zero spots of the vernier ... zero spots of the main scale. If they do not match , then such error is called zero error.

What is index error ?

Description : What is index error ?

Last Answer : Usually such errors occur in the light bench. There are indicator marks on the bench stand. The distance between the index spots of the two stands and the actual distance between the two objects (pins and ... case, if you take a lesson by looking at the index spots, the error is called index error.

What is parallax error ?

Description : What is parallax error ?

Last Answer : The apparent change in position of a target as the direction of vision changes is called parallax. For this reason, the measurement error is called parallax error.

What is a back error ?

Description : What is a back error ?

Last Answer : : Backwards Errors: This type of error usually occurs when the instruments , nuts, etc. , which are made based on the principle , are a little old. This is because too much use can cause the ... error. This error can be avoided by turning the screw in the same direction while taking the lesson.

What is a mechanical error ?

Description : What is a mechanical error ?

Last Answer : : There may be some errors in the equipment used for testing. All these errors are called mechanical errors. The following are the main errors of the device: Zero error , Backlash error, Level error or Horizontal line error.

What is random error ? What is a coincidence ?

Description : What is random error ? What is a coincidence ?

Last Answer : When a constant quantity is measured several times, the error due to which the measured meaning is inconsistent is called random error.

What is mechanical error ? What is a mechanical fault ?

Description : What is mechanical error ? What is a mechanical fault ?

Last Answer : : In physics, if there is any defect in the instrument that we need for measuring while testing something, it is called mechanical error.