Q. मात्रकों की अंतर्राष्ट्रीय पद्धति कब लागू की गई ?

(A) 1971 ई.
(B) 1983ई.
(C) 1991ई.
(D) 1969 ई.

✅ Correct Answer: (A) 1971 ई.

Published by Priyanka Tomar ⭐ 35.28K Points at 25-May-2024 04:09 pm in Physics

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