What is the below Rebus indicate?

John was drowned by he was not wet. How?

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

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

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

What does below Rebus say?

XLR8

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?

Which alphabet is a part of our body?

Can you solve the below tricky visual equation?