Spot what is wrong here in below Picture?

What is black when you buy it, red when you use it, and gray when you throw it away?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?

what does this picture(rebus) riddle means ?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

If your uncle’s sister is not your aunt, what relation is she to you?