If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

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?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

I am sure no one can have two things for dinner. what are they?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Can you find the thief by just looking at the picture below?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

If eleven plus two equals one, what does nine plus five equal?

What does below rebus means ?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.