Verbal Reasoning - Mental Ability Questions

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

12 : 54 :: 15 : ?

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

FJSP : DLQR :: GMIL : ?

Find the correct option which has a similar relationship.

Reactants : Products :: H2 + O2 : ?

Select the missing word based on the given related pair of words.

Butter : Milk :: Book : ___

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

76 : 42 : : 46 : ?

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

LAMP : IXJM :: FISH : ?

Which number replaces the '?' in the given series

108, 127, 2413, 2430, 41310, ?, 619875 

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

97 : 63 : : 67 : ?