When a clock controlled by a pendulum is taken from planis to mountain, it becomes slow but a wrist watch controlled by a spring remains unaffected. Why ?

When a pendulum is taken to a mountain, it becomes slow, but a wrist watch controlled by a spring remains unaffected. Explain.

Will a pendulum clock lose or gain time when taken to the top of a mountain ?

One of the two clocks on earth is controlled by a pendulum and other by a spring. If both the clocks be taken to the moon, then which clock will show same time as that on earth

Will a pendulum clock lose or gain time when taken to the top of a mountain?

A pendulum clock and a wrist watch are taken from the earth's surface to a mountain. What will be the effect on their time periods at the mountain ?

A second's pendulum is taken from a place where g=9.8 ms^(-2) to a place where g=9.7 ms^(-2) .How would its length be changed in order that its time period remains unaffected ?