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

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

What kind of band never plays music?

What time is it when an elephant sits on a fence?

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

Which flower has two lips?

1. How can we put an elephant in the refrigerator?
2. How can we put a Giraffe in a refrigerator?
3. The king of the jungle invites all the animals to a party everyone comes except for one animal, which animal?
4. You come to a crocodile-infested lake, you can't go around it, you can't co under it and you can't go over it, how do you get across?

Who are the happiest people in IPL match?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?