Verbal Reasoning - Mental Ability Questions

Select the related word/letters/numbers from the given alternatives: DBCE : QOPR :: JLKI : ?

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.
Biological

Select the related word/letters/numbers from the given alternatives:
3 : 243 :: 5 : ?

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

WAX, YED, AIJ, CMP, ?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

TER_TE_S_ER_

A word is represented by only one set of numbers as given in any one of the alternatives. The sets of numbers given in the alternatives are represented by two classes of alphabets as shown in the given two matrices. The columns and rows of Matrix-I are numbered from 0 to 4 and that of Matrix-II are numbered from 5 to 9. A letter from these matrices can be represented first  by its row and next by its column ,for example 'F' can be represented by 41,24 etc and 'V' can be represented by 57,78 etc. similarly,you have to identify the set for the word ''MOCK''.

In a row, there are 6 boys between A and B and A being the first boy in row. There are 3 boys between B and C. If there are 12 boys after C, then how many minimum boys are there in the row?

If EFMIJ means DELHI, then the last letter of the word got by decoding IQBOS is