Verbal Reasoning - Mental Ability Questions

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

10, 12, 14, 16, 18, ?

Select the related word/letters/number from the given alternatives.

Subhas Chandra Bose : Orissa :: Mahatma Gandhi : ?

Select the related word/letters/number from the given alternatives.

PHOTOGRAPHER : CAMERA : : WRITER : ?

Select the related word/letters/numbers from the given alternatives:

DHL : PTX :: BFJ : ?

Select the missing term based on the given related pair.

A girl counted in the following way on the fingers of her left hand : She started by calling the thumb 1, the index finger 2, middle finger 3, ring finger 4, little finger 5 and then reversed direction calling the ring finger 6, middle finger 7 and so on. She counted upto 1995. She ended counting on which finger ?

In a certain code language Infinite means Size. What is the meaning of  Indefinite in that code language? 

Select the related letters from the given alternatives.

BEH : KNQ :: FIL : ?