A) A clock when taken on a mountain can be made to give correct time if we change the length of pendulum suitably
B) An increase in value of g makes a clock go slow
C) If the length of a pendulum is increased, the clock becomes fast
D) A clock when taken to a deep mine or carried to the top of a mountain becomes slow
Correct Answer: D
Solution :
Above or below the earth's surface, value of acceleration due to gravity decreases, so time period\[\left( T=2\pi \sqrt{\frac{l}{g}} \right)\]increases ie, clock will become slow.
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