Verbal Reasoning - Mental Ability Questions

In the following question, select the related letters from the given alternatives.
ELQZ : AJOV : : VXTD : ?

Pointing towards a man Soumya says, "His mother's daughter is my sister". How is Soumya related to the man?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series. 4, 13, 40, 121, ?

In a row of boys, Amit is ranked 12th from top and Ratan is 15th from bottom. They interchange their position. Ratan now becomes 37th from bottom. How many total boys are there in the row?

In the following question, select the related word from the given alternatives.
Goiter : Iodine : : Anemia : ?

In the following question, select the related number group from the given alternatives.
19 : 367 : : ? : ?

If 8α9 = -72, -9α3 = 27 and -6α1 = 6, then find the value of -3α6 = ?

A points to B and says to a lady C "His mother is the only daughter of your father". If so, how is C related to B?