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bihar board 10th model paper 2023 1. 1A° (एंगस्ट्रान) का मान क्या होता है- (A) 10-10 m (B) 10-8  m (C) 10-11 m (D) इनमें कोई नहीं  …

bihar board 10th model paper 2023 1. प्रकाश तरंग का उदाहरण है- (A) ध्वनि तरंग (B) विधुत चुम्बकीय तरंग (C) पराबैगनी तरंग (D) इनमें…

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