# A pendulum clock is taken 1km inside the earth from mean sea level. Then the pendulum clock..

Q: A pendulum clock is taken 1km inside the earth from mean sea level.Then the pendulum clock

(a) loses 13.5 s per day

(b) gains 13.5 s per day

(c) loses 7s per day

(d) gains 7s per day

Ans: (c)