Verbal Reasoning - Mental Ability Questions

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

Select the related word/letters/number from the given alternatives.
GT : IV : : KX : ?

In a certain code language, 'x' represents '+', '÷' represents 'x', '­' represents '÷' and '+' represents '­'. Find out the answer to the following question.

5 ÷ 4 ­ 10 + 7 x 16 = ?

In a row of swimmers Manish, is 23rd from the left end. Ramesh is 11 ranks to the left of Manish. If Ramesh is 16th from right end, then how many swimmers are there in this row?

P, Q, R, S and T are standing in a line. P is taller than S but shorter than Q. T is shorter than S but taller than R. Who is the second tallest of them all?

P is the brother of Q. Q is the brother of R. P is the son of S. Based these three statements, much of the following statements cannot be definitely true?

In a certain code language, '-' represents '+', '+' represents 'x', 'x' represents '÷' and '÷' represents '-'. Find out the answer to the following question.

8 ÷ 6 - 5 + 70 x 10 = ?

Rearrange the jumbled up letters to form a meaningful word and find the odd one out.