In a microphone

A. sound energy is converted into electrical energy

B. electrical energy is converted into sound energy

C. sound energy is converted into mechanical energy

D. mechanical energy is converted into sound energy

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  1. The Milky Way is
  2. The minimum velocity required by a satellite to escape earth's gravitational pull is
  3. The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because
  4. It is easier to climb down a staircase than climb up because in climbing down
  5. The line on earth's surface passing through the places having zero dip is called the magnetic equator.…
  6. The enormous energy released in nuclear and thermonuclear reactions is due to conversion of
  7. The planet that spins Caster than any other planet is
  8. An electric fan converts
  9. The unit of heat energy is
  10. A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps
  11. A bar magnet tied in the middle with a thread is suspended at the South Pole of the earth. The magnet…
  12. Separating particles from a suspension is effected by
  13. Two tumblers stuck together can be separated by
  14. The colour of a star is an indication of its
  15. The overhead wires supported by high towers in the grid system carry
  16. The scientist who first sent electromagnetic waves to distant places was
  17. The plants in a greenhouse are enclosed in a glass enclosure because
  18. Choose the correct answer
  19. A sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field…
  20. Which of the following wires of same dimensions offers least resistance to the ,flow of current?
  21. Nichrome is used in electric heaters and irons because
  22. An electric kettle used for boiling hard water has a white scale deposited on its heating element. This…
  23. In a river, the currents are fastest where the river la
  24. The Space Application Centre for training in Satellite Communication Technology is located at
  25. Hot water is poured simultaneously in four metallic tumblers painted outside with different paints.…
  26. Which of the following has the highest refractive index?
  27. A rheostat is used
  28. When a body is projected upwards
  29. When the disturbed electrons of an exited atom transfer back into lower energy levels they emit energy…
  30. The theory that the earth constituted the centre of the universe around which the sun and the planets…