What goes up but never comes down?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

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

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Solve the equation in the image by looking at the pattern closely.