Verbal Reasoning - Mental Ability Questions

Pointing to a lady, a man said, "The son of her only brother is the brother of my wife." How is the lady related to the man ? 

Choose the missing terms in the given series from the four alternatives given below.

C, E, G, J, M, Q, ?

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

RPQ : PNO : : JEK : ?

Which number will complete the series?

0,1,4,15,?,325,1956

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

43, 44, 46, 47, 49, 49, 50, ?

Choose the correct alternative which will complete the following series:

21, 55, 19, 50, 17, 45, ?

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

7 : 56 : : 9 : ?