Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Solve this tricky question. You are trapped in a forest. With you, you have a gun preloaded with two bullets in it. In front of you, there is a tiger, a leopard and a jaguar.

How do you survive?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Why do people go to bed?

Can you name four days which start with the letter 'T'?

What has one eye, but can’t see?

You bought me for dinner but never eat me. What am I?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?