Science for Ninth Class Part 1 (Hindi) Physics Book-9, 1/e

About the Author

Lakhmir Singh :- M.Sc. From Delhi University in 1969. Lecturer in Dyal Singh College of University of Delhi..

Manjit Kaur :- B.Sc.,B.Ed. From Delhi University in yr 1970. Senior Teacher of Science in reputed school of Directorate of Education, Delhi.