Verbal Reasoning - Mental Ability Questions

In the following question, select the missing number from the given series.

2, 5, 12, 27, ?

Select the related word/letters/numbers from the given alternatives:
ECFG : FDGH :: SQTU : ?

From the given alternative words, select the word which cannot be formed using the letters of the given word:

ENVIRONMENT

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

RS, WX, BC, ?

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

FU, GT, HS, IR, ?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
642 x 6 ÷ 25 + 4 = ?

A courier delivery man cycles 6 km South, then turns West and cycles 2 km West, then turns to his right and cycles 6 km, then turns West and cycles 8 km.Where is he now with respect to his starting position?

Find the odd word/letters/number from the given alternatives.