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

Can you name an animal whose killing cannot be performed without spilling your own blood?

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

When it's bad luck to meet a black cat?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

What can go up a chimney down, but can’t go down a chimney up?

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?

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?

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?

Different lights make me strange by changing me into different sizes. What am I?