Basic General Knowledge
Microphone is used to convert

electrical energy into sound waves
sound waves into electrical energy
sound waves into magnetic currents
sound waves into light rays

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Basic General Knowledge
Gopal Krishna Gokhale

started as a maths teacher and rose to the position of the principal of Ferguson College, Pune
All of the listed here
founded the servants of India Society
served as President of the Indian National Congress in 1907

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