Verbal Reasoning - Mental Ability Questions

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

Which of the following diagram represents the relationship among Tall men, Black haired, Indians?

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

In the following question, select the related letter pair from the given alternatives.PIR : OHQ : : ? : ?

If 4 * 5 % 3 = 8000 and 2 * 3 % 2 = 36, then 4 * 3 % 3 = ?

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

2, 3, 7, 16, ?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
25 + 10 ÷ 240 x 16 = ?

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?