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

Pendulum after some time becomes slow in motion and finally stops due to

What happens to the weight of a body when it is taken to a mountain peak?

Nitric oxide becomes brown when released in air. Explain why ?

A bird is in a wire cage hanging from a spring balance.Is the reading indicated on the balance,when the bird is flying out in the cage greater than ,less than or the same as that when the bird is sitting in the cage ?Explain.

It is difficult to see through a closed glass window from the inside of a well lighted room,when it is dark outside.However,it becomes relatively easy to see outside,when the lights in the room are switched off.Explain.

Oranges are to be transferred from larger boxes into smaller boxes. When a large box is emptied, the oranges from it fill two smaller boxes and still, 10 oranges remain outside. If the number of oranges in a small box is taken to be x , what is the number of oranges in the larger box?