What number should come in place of the question mark below?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

Can you count the number of triangles inside a triangle?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

Can you replace the question mark with the correct number in the below table sequence?

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

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?