MPSC PYQSciencemarathi
Say whether following sentences are true or false: (I) For propagation of sound medium is necessary. (II) Unit of frequency of sound is Hertz. (III) Loudness of sound is expressed in decibel unit.
A.(I), (II), (III) are true
B.Only (I), (II) is true
C.Only (II) is true
D.(I), (II), (III) are false
Correct answer: A