A maths symbol is hidden in the below Bar Graph. Can you decipher it?

What is wrong in the below Picture?

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

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

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Can you place six X (crosses) in below board without making three in a row in any way ?

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

I am quite hot but become too cold if you remove the first two letters. What am I?

Which five letter word can be added at the end of below word to form a
valid word?

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The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?