Suppose you are in a dark room . Can you see objects in the room ?Can you see objects outside the room ? Explain.

Lenses used by those who cannot see near objects are

Can any object have mechanical energy if its momentum is zero? Explain.

Suppose you and your friend are on the moon will you be able to hear any sound produced by your friend ?

why does it take some time to see objects in a cinema hall when we just enter the hall from bright sunlight ? Explain in breif?

Suppose you are outside your home and an earthquake strikes . What precaution would you take to protect yourself ?