Verbal Reasoning - Mental Ability Questions

Dharun has a brother Anand. Dharun is the son of Kumar. Krishnan is Kumar's father. How is Anand related to Krishnan?

If IRON is written as GOKI, then KNIFE may be written as

Prema is Ajay's sister. Benita is Ajay's mother. Benjamin is Benita's father. Leela is Benjamin's mother. How is Prema related to Leela

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

AB, BC, CD, DE, EF ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
NM, PK, SI, ?

If South-East is changed to North and North-East to West and so on, then what will come in place of South?

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