Verbal Reasoning - Mental Ability Questions

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

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, ?

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

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

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

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?

The weights of 4 boxes are 30, 40, 50 and 100 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes and in a combination a box can be used only once?