Verbal Reasoning - Mental Ability Questions

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

_r_r_t_r_r_t

If "S" denotes "multiplied by", "P" denotes "subtracted from", "R" denotes "added to" and "Q" denotes "divided by", then 14641 Q 121 P 100 S 2 R 100 = ?

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

75 - 5 + 25 ÷ 125 = ?

A brother and sister leave home for school. The brother goes 0.5 km East, then turns right and goes 3.5 km and reaches his school. The sister goes 2.5 km North, then 1 km West, then turns left and goes 6 km and reaches her school. Where is the brother's school with respect to the sister's school?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
l m _ o _ n m _ l _ n _ _ n m l

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

11, 121, 1331, 14641, ?

A man is facing west and he turns anti-clockwise by 90 degrees and moves 10m straight, then he again turns 90 degrees anti-clockwise. Which direction is the man facing now?

If EXPLAIN is coded as BUMIXFK, then how will GYM be coded as?