What do you think with the below Picture ?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

I am lying and I always lie. Tell me whether I am lying or telling the truth.

I am written with two letters.
I said with the one.
I usually am seen with the two.

Who am I?

What has 88 keys?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

Name a key which is hardest to turn.