Why do you find that most of the buildings are deprived of the 13th floor?

Can you place six X (crosses) in below board without making three in a row in any way ?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Imagine you are in a room with no windows or doors. How will you get out?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

What does below Rebus mean ?

esgg sgeg gegs gsge

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Different lights make me strange by changing me into different sizes. What am I?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744