Which object does not depend on changing one form of energy to a different form?
A
B
C
D None of these
Ans 1:
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Class : Class 5
C IS NOT STETHOSCOPE IT IS A CD WITH A CABLE . A CD HAS CHEMICAL ENERGY [BATTERY] AND IT DOESN'T CONVERT IT INTO ANY OTHER FORM HENCE C IS ALSO CORRECT
Ans 2:
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Class : Class 8
A is not correct as it converts wind energy into electrical energy
B is not correct as it converts electrical energy int heat energy.
and I am not sure what is the c one