Ans . A device used in sound reproduction systems for converting sound in to electrical energy
If you have any problem or doubt regarding Physics Questions and Answers for Competitive Exams, you can ask me in the comment section. To more practice for Physics General Knowledge Questions, Visit next page.
This is Rajesh Bhatia. He has been teaching to the students for preparing for competitive exams for 10 years.
Talk to him about your problems by connecting social media.
Like him on Facebook: https://www.facebook.com/examsbook