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Ronan Asked :

21-11-2021 Pneumotachometers

Q. Which of the following method uses only the human eye as a measuring instrument?

A. Telemetric
B. Colorimetric
C. Polarimetric
D. Calorimetric

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Dapzoi Verified
Commented on 2021-11-21 12:23:30 (IST)
Answer: B

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.