Bihar Polytechnic ( तरंग एवं ध्वनि ) Wave and Sound Objective Question Paper 2023 Target4Exam Apr 17, 2021 0 Polytechnic Physics Question Bihar Polytechnic ( तरंग एवं ध्वनि ) Wave and Sound Objective Question Paper 2023 :- यहां पर पॉलिटेक्निक ,…