PDF chapter test TRY NOW

Fill the blanks using the given options:
 
CompressionAmplitudeRarefaction
UltrasoundThrustOil
SONARCochleaECG
  
1) I can break kidney stones into fine grains. Who am I?
 
2)  It can convert the sound variation produced by the heart into electric signals. The word 'It' refers to?