एक लाउडस्पीकर ________ ऊर्जा को ध्वनि ऊर्जा में बदलता है। - A loudspeaker changes ________ energy into sound energy. - Ek Loudspeaker ________ Urja Ko Dhwani Urja Me Badalta Hai . Gen Science GS in hindi, question answers in hindi pdf questions in hindi, Know About Gen Science GS online test Gen Science GS notes in hindi quiz book