Verbal Reasoning - Mental Ability Questions

Introducing a woman, a boy says, "She is the wife of my grandfather's son". How is the woman related to the boy?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
24 x 6 - 8 + 2 = ?

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

50 + 3 ÷ 125 x 5 - 25 = ?

In the following question, select the related number from the given alternatives.
9143 : 9963 : : 6731 : ?

In the following question, select the related word pair from the given alternatives.
Canada : Ottawa : : ? : ?

Water :Ocean :: Snow : ?

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

130, 450, 970, 1690, ?

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series. 100, 50, 52, 26, 28, ? , 16, 8