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A Voltage amplifier
B Current amplifier
C Oscillator
D All of these

A Moon
B Sun
C Earth
D Stars

A Longitudinal waves
B Mechanical waves
C Electromagnetic waves
D None of them

A Gravitation force
B Periodic force
C Applied force
D Elastic restoring force

A Electromagnetic waves
B Mechanical waves
C Long waves
D None of them

A Equal to each other
B Equal to each other but in opposite direction
C Reciprocal to each other
D None of them

A Meter
B Newton
C Kilogram
D Hertz