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

What jumps when it walks and sits when it stands?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

Find out which of the given views in the picture is accurately the top view of the given pyramid.

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

A man is sitting in a bar when a rich man sits next to him. He turns to the rich man and says, “Did you know I know almost every song that has ever existed?”

The rich man laughs. The man then says, “I bet you all the money you have in your wallet that I can sing a genuine song with a lady’s name of your choice in it. The rich man laughs again and says, “OK, how about my daughter’s name, Jamie Armstrong-Miller?” Minutes later, the man collects his cash and the rich man goes home cashless. What song did the man sing?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H