Verbal Reasoning - Mental Ability Questions

In the following question, select the related letter/letters from the given alternatives.

GHJ : JKM : : NOQ : ?

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

QC : T : : SF : ?

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

Sound : Medium : : Light : ?

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

Antique : Old : : Weak : ?

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

GLIDERS : ERSDGLI : : TOASTER : ?

In the following question, select the related number from the given alternatives.

44 : 47 : : 58 : ?

Select the related letters from the given alternatives.

BEH : KNQ :: FIL : ?

If 18!10 = 4, 10!4 = 3 and 4!8 = -2, then find the value of 16!18 = ?