'ज्ञानोदय' में कौन-सी

Choose the odd number out of the given option.

Find the out one odd: 

Select the odd letters from the given alternatives?

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

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

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.

Five letter-clusters have been given out of which four are alike in some manner and one is different. Select the one that is different.

Three of the following four number-clusters are alike in a certain way and thus form a group. Which is the one that does not belong to that group?

Four of the following five are somehow similar and therefore create a group. Which is not related to this group?

U, F, Z, O, S