List of top Logical Reasoning Questions on Letter Based asked in KMAT

How many meaningful English words can be made with the letters ESDO using each letters only once in each word?

How many pairs of letters are there in the word OPERATION in which the difference between them is the same as in the English alphabet ?

The letters skipped in between the adjacent letters in the series are followed by equal space. Which of the following series observes this rule?

What should come next in the following letter series ?
H G F E D C B A H G F E D C B A H G F E D C B A H