Time-sharing OS switching CPU rapidly among tasks

Find the odd one out.

A, E, I, L, Q, U

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.

Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different.

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 are related in the same way as are the numbers of the following sets.

(13, 11, 52)

(9, 27, 76)  

In the following question, select the odd letter/letters from the given alternatives. 

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

In the following question, select the odd word from the given alternatives.

Odd one out