Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Which is faster, Heat or Cold ? Explain.

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

What English word has three consecutive double letters?

Replace the question mark with the correct number in below Picture:

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?