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Mr. Dubey • 53.50K Points
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Q. Which standard is fixed and used forindustrial laboratories?

(A) international standard
(B) primary standard
(C) secondary standard
(D) working standard
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Explanation by: Mr. Dubey 
 secondary standards are fixed and used in industrial laboratories. working standards as its name suggests is used for day to day measurements. international standards are accepted internationally and primary standards are used in different parts of world which will not be accessible outside for calibration.

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