What has many keys but can’t open a single lock?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Give it food and it will live; give it water and it will die.

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

Why 1729 is a magic number? Answer Logically.

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

If you say my name, I will no longer exist. What am I?

The dirtier I get, the whiter I look. Who am I?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

It is an eleven letter word.
The first, second, third and fourth letters form a banquet's name.
The fifth, sixth and seventh letters form a car's name.
The eighth, ninth, tenth and eleventh letters form a mode of transport.

Can you identify what word it is?