Which of the following method uses only the human eye as a measuring instrument?(a) Telemetric(b) Colorimetric(c) Polarimetric(d) CalorimetricI had been asked this question in examination.My doubt stems from Pneumotachometers topic in section Pulmonary Function Analysers of Biomedical Instrumentation

Which of the following method uses only the human eye as a measuring i

1.	Which of the following method uses only the human eye as a measuring instrument?(a) Telemetric(b) Colorimetric(c) Polarimetric(d) CalorimetricI had been asked this question in examination.My doubt stems from Pneumotachometers topic in section Pulmonary Function Analysers of Biomedical Instrumentation
Answer» Correct choice is (b) Colorimetric Explanation: A colorimetric method in its simplest form uses only the human EYE as a measuring instrument. This involves the comparison by visual MEANS of the colour of an unknown solution, with the colour produced by a single standard or a series of standards. The comparison is made by OBTAINING a match between the colour of the unknown and that of a PARTICULAR standard by comparison with a series of standards prepared in a similar manner, as the unknown.

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