Question

Give two examples of motion which is both circular as well as periodic

Answer 1

there are many example of motion with are both periodic and circular motion.
one of the example if motion of planet like earth. earth and planet move in circuar motions and there also repeat after some period(365 for earth)

anotheR example is hand of clock(hour hand,minute hand and seconfd hand)
thery repesat after a aperticular interval of time(60 minute for hour hand)