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

Which is faster, Heat or Cold ? Explain.

There is a movie name hidden in the picture that is attached with this question. Can you find out which movie is it?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

How can you drop a raw egg from a height onto a concrete floor without cracking it?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?