Question

Which of the following statements is/are true?

• 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

Answer 1

Answer: (D)

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.