Can you count the number of quadrilaterals in the picture below?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

What does this mathematical rebus means ?

There is a certain crime, that if it is attempted, is punishable, but if it is committed, is not punishable. What is the crime?

What is the next shape from answers A, B, C, and D figure?

What is the next number in this matchsticks series riddle?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

What 5-letter word typed in all capital letters can be read the same upside down?

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