Question

[10] SI এককে 4°C উয়তায় বিশুদ্ধ জলের ঘনত্ব কত? (11) পরমাণুর কেন্দ্রকের ব্যাস কোন এককে মাপা হয়।
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Answer 1

Answer:

The ISI mark is by far the most recognised certification mark in the Indian subcontinent. The ISI is an initialism of Indian Standards Institution, the name of the national standards body until 1 January 1987, when it was renamed to the Bureau of Indian Standards.