Verbal Reasoning - Mental Ability Questions

In a certain code language, "NUMBER" is written as "156897" and "BARREN" is written as "847791". How is "RUBBER" written in that code language?

Race : Fatigue :: Fast : ?

Negative plus a positive equals

A family consists of six members P, Q, R, X, Y and Z. Q is the son of R but R is not mother of Q. P and R are a married couple. Y is the brother of R. X is the daughter of P. Z is the brother of P. Who is the father of Q ?

Three of the following four are alike in a certain way and hence form a group. Which is the one that does not belong to that group?

In a street, there are certain number of houses. People in that street are decided to paint their houses with certain colours. If four houses are painted with each colour, then one house will be left without any colour. If five houses are painted with each colour, then one colour will remain. Find the number of houses in that street ?

In the following question, various terms of an alphanumerical series are given with one or more terms missing as shown by (?). Choose the missing terms out of the given alternatives. A/2, B/4, C/6, D/8, ?, ?

A is B's brother, C is A's mother, D is C's father, F is A's son. How is A related to F's child?