Verbal Reasoning - Mental Ability Questions

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

WYV, ? , IKH, BDA

In these questions, the relationship between two elements is shown in the statements. These statements are followed by two conclusions.
Statement:
Z < L < W = N = K < A
Conclusion:
I. A > L
II. Z = A

Rajiv is the brother of Arun. Sonia is the sister of Sunil. Arun is the son of Sonia. How is Rajiv related to Sunil?

Find the next in this series:
YC3, XF6, WI9, ........

In a certain code language, "DURING" is written as "GRUFQD". How is "PICKED" written in that code language?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
550 x 22 - 24 + 3 = ?

Select the related word/letters/number from the given alternatives.
Donkey : Brays :: Monkey : ?

The following question consist of two words that have a certain relationship to each other, followed by four alternatives. Select the best alternative that has the same relationship as the original pair of words

Carnivore: Herbivore