# error

### Asked by rajveermundel7 | 18th May, 2022, 09:01: PM

Expert Answer:

### The result of every measurement by any measuring instrument contains some uncertainty.
This uncertainty is called error. Every calculated quantity which is based on measured values,

also has an error.
In general, the errors in measurement can be broadly classified as (a) systematic errors and

(b) random errors.

The systematic errors are those errors that tend to be in one direction, either positive or

negative. Some of the sources of systematic errors are :

(a) Instrumental errors that arise from the errors due to imperfect design or calibration

of the measuring instrument, zero error in the instrument, etc.
(b) Imperfection in experimental technique or procedure

(c) Personal errors that arise due to anindividual’s bias, lack of proper setting of

the apparatus or individual’s carelessness in taking observations without observing

proper precautions.
Random errors

The random errors are those errors, which occur irregularly and hence are random with respect
to sign and size. These can arise due to random and unpredictable fluctuations in experimental

conditions
The magnitude of the difference between the true value of the quantity and the individual measurement value is

called the absolute error of the measurement.

The relative error is the ratio of the mean absolute error to the mean value of the quantity measured
When the relative error is expressed in per cent, it is called the percentage error .

also has an error.

(b) random errors.

The systematic errors are those errors that tend to be in one direction, either positive or

negative. Some of the sources of systematic errors are :

(a) Instrumental errors that arise from the errors due to imperfect design or calibration

of the measuring instrument, zero error in the instrument, etc.

(c) Personal errors that arise due to anindividual’s bias, lack of proper setting of

the apparatus or individual’s carelessness in taking observations without observing

proper precautions.

The random errors are those errors, which occur irregularly and hence are random with respect

conditions

called the absolute error of the measurement.

### Answered by Thiyagarajan K | 19th May, 2022, 12:47: PM

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