12th class physics (2nd year,fsc part 2) chapter 21 short questions
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12 class physics notes solved exercise & Short Questions of notes chapter 21-2nd year physics notes chapter 21

According to syllabus: Federal board intermediate & secondary education "fbise"fasilabad board-multan board-DG Khan board-sindh board-sahiwal board-karachi board-sargoda board-lahore board.