Verbal Reasoning - Mental Ability Questions

In the following series, one letter is missing as shown by the ?. Select the missing letter from the given options.

Q, N, K, H, ?

If 16α1 = 8, 14α6 = 42 and 12α5 = 30, then find the value of 2α6 = ?

Select the related number from the given alternatives.
12.5 : 6.25 :: 7 : ?

Select the related word/letters/number from the given alternatives.
Luminous intensity : Candela : : Pressure : ?

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

AZ, BY, CX, ?

If in a certain language, STRING is coded as TSIRGN, how is RANDOM coded in that code?

In a certain code language, “LUNGS” is written as “OWQIV”. How is “HEART” written in that code language?

Introducing a man, a woman says, "His son's mother is the only daughter of my mother". How is the man related to the woman?