I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

What is more useful when it is broken?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

How many letters are in the alphabet?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Can you solve this picture maths equation?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

If an electric train is travelling south, then which way is the smoke going?