Verbal Reasoning - Mental Ability Questions

In the following question, select the number which can be placed at the sign of ? from the given alternatives.

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.
6, 18, 54, ? , 486, 1458

Select the number which can be placed at the place of ? in the following question

Starting from a point, a person travels 3 km towards east and turns left and travels 4 km. Then again he turns to left by 45° and moves straight. Which direction is he facing now?

A is in the east of B, who is in the east of Q. If Q is in the south of P, then in which direction of A, is P?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
BT, DR, FP, ?

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

xy_kx_zk_yzk xyz_ _

In a certain code language, "DIGIT" is written as "@#^#*" and "EAR" is written as "?!<". How is"TIGER" written in that codelangauge?