Verbal Reasoning - Mental Ability Questions

Two angles whose sum is 180 degrees are

There are six persons A, B, C, D E and F. C is the sister of F. B is the brother of E's husband. D is the father of A and grandfather of F. There are two fathers, three brothers and a mother in the group. Who is E's husband ? 

Introducing a boy Rahul says, "He is the son of the brother of the only daughter of my maternal grandfather". How is the boy related to the Rahul?

In which of the following pairs,second person is to  the immediate right of the first person ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
IJ, PQ, XY, ?

B is the brother of A and E is the brother of D. If D is the father of B then how E and A are related?

Starting from his home, a boy rides on his bike for 8 km towards west, takes a left turn and travels 10 km more. From there, he turns 180° in the clockwise direction and travels another 16 km. Finally, he takes a right turn and travels 8 km more. How far and in what direction is he now from his original position?

Choose the word which is least like the others word in a group?