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Class 9 Science Notes for Sound

Get here Class 9 Science Notes for Sound. Download 9th Class Science Notes for CBSE and State Boards following NCERT books. More Detail

NCERT

The National Council of Educational Research and Training (NCERT) is an autonomous organisation set up in 1961 by the Government of India to assist and advise the Central and State Governments on policies and programmes for qualitative improvement in school education.