Can we convert sound energy into electrical energy. This should be possilble per Law of Conservation of energy

yes, but not economical.

But you won't put the wind turbines out of business because you lose so much energy on the way; it gets dissipated as heat & whatnot.

Dear as from the definition of Electromotive force " That the force which convert non electrical eenergy in to electrical energy is called electromotive force" So I think by that definition it is possible that we can convert non electrical energy like sound into electrical energy..... i think If we should focus on Ultrasonics.......

Sound energy can be converted into almost any other kind or energy (with the exception of nuclear energy). However, air is not a good transmitter of energy and recovering energy from noise polution would not be very practicable. The loudest recorded noise (that I have read about) was the blast from a Saturn rocket at Cape Canaveral, Florida. The sound waves (rarefactions and condensations) varried from near vacuum to twice(?) atmospheric pressure. You could harness such massive sound pressure but would not want to be anywhere near it. I also read that a Frenchman(?) invented a giant compressor-driven police whistle nearly as big as a car that generated a noise so low in frequency that he could not hear it but it turned his insides into jelly from the vibrations. Also even though a large symphony orchestra can work up a sweat perhaps playing allegro FFF! they only impart a few watts of energy to the air in the concert hall. So you are correct in principle but could easily find a more efficient (and safer?) means of obtaining power. Good luck.

sure , in a lab. get some drum , and add a magnet to it , let the magnet moves inside a coil , the drum vibrates due to wave sounds , practicaly no

Yes! That is what happens when you speak into a telephone receiver! The person at the other end hears you because the electical impulses are converted back into sound energy

"Dear as from the definition of Electromotive force " That the force which convert non electrical eenergy in to electrical energy is called electromotive force" So I think by that definition it is possible that we can convert non electrical energy like sound into electrical energy..... i think If we should focus on Ultrasonics......." What a load of waffle. joesq has already told you. Every time someone speaks into a microphone a pressure wave (sound energy) is converted into electrical current (electrical energy.)

definitely u can, this is evident in microphones

The microphone does exactly that. It converts sound energy in to electricity. Unfortunatly we can't catch all the sound waves that are spreading through the environment. A microphone only catches a small fraction of sound energy. Rest of the energy is dissipated. Thus the converted electrical energy is so small and we can't send it directly to a speaker through wires. That's why we need a amplifier. Need to know more? feel free to ask.