Alphabet Test Questions

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

DEW, ZAS, VWO, RSK, ?

How many A's are there in the following sequence which are immediately followed by B as well as immediately preceded by Z?

A M B Z A N A A B Z A B A Z B A P Z A B A Z A B 

What should come next in the following letter series based on English alphabet ?
CEA JLH QSO ?

The opposite of right is the opposite of

Which of the following is the sixth to the left of the twentieth from the left end of the below arrangement ?
BM%R#J@K!DF69L4*15NEP23AYQZ#7UG

What word will come in middle if all of the following are arranged alphabetically as in a dictionary?

Donkey, Donator, Donjon, Donate, Donative.

If each vowel of the word WEBPAGE is substituted with the next letter of the English alphabetical series, and each consonant is substituted with the letter preceding it, which of the following letters will appear thrice?

If it is possible to make a meaningful word from the second, the seventh, the ninth and the eleventh letters of the word ORGANISATION using each letter only once, then which will be the third letter of that word ? If no such word can be formed, your answer would be 'X' and if more than one such words can be formed, your answer would be 'M' ?