(a) A pendulum clock
(b) A watch having main spring to keep it going
(c) Either a pendulum clock or a watch
(d) Neither a pendulum clock nor a watch
Answer: b
(7)
5/5 - (2 votes)
(a) A pendulum clock
(b) A watch having main spring to keep it going
(c) Either a pendulum clock or a watch
(d) Neither a pendulum clock nor a watch
Answer: b
(7)
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