Correct Answer - Option 2 : Instrumental error
CONCEPT:
-
Error: It is the Uncertainty in measurement by any measuring instrument.
-
Error in measurement can be broadly classified as:
- Systematic errors
- Random errors.
-
Systematic errors are those that tend to be in one direction, either positive or negative.
-
Random errors are those errors that occur irregularly and are random with respect to sign and shape.
- The least count error is basically associated with the resolution of the instrument.
EXPLANATION:
- As the thermometer measures the boiling point of water 104 °C rather than 100 °C, the error introduced here is called instrumental error.
- Because of wrong calibration or imperfect design of the measuring instrument.
-
Instrumental errors occur due to wrong calibration or imperfect design of the measuring instrument.
-
Random errors are those errors that occur irregularly and are random with respect to sign and shape.
- The least count error is basically associated with the resolution of the instrument.
-
Error due to parallax occurs when our eyes make an angle with the measurement markings. This results in wrong readings.
Hence option 2) is correct.