Which among the following is the world's busiest

Select the letter cluster which does not belong to the same group from the given alternatives.

Four of the following five are identical in a certain way, so make a group.

Which of these is not related to this group?

Q, M, I, S, T

Select the odd letters from the given alternatives?

Find the odd one out from the following options. 

Four letter-clusters have been given out of which three are alike in some manner and one is different. Select the odd one.

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the letter-cluster that is different.

Select the option in which the numbers share the same relationship as that shared by the numbers of the given set.

(12, 63, 318)

Find the odd set of numbers from the given alternatives.

Three of the following four letter-clusters are alike in a certain way and one is different. Choose the odd one.

Four pairs of letter-cluster have been given out of which three are alike in some manner, while one is different. Choose the odd one.