Verbal Reasoning - Mental Ability Questions

Select from four alternative diagrams, the one that best illustrates the relationship among the three classes  :  Pigeons, Birds, Dogs

The following equation is incorrect. Which two signs should be interchanged to correct the equation?

10 x 4 + 5 - 30 ÷ 6 = 31

egg: fish : : ________ : plant

Identify the diagram that best represents the relationship among classes given below

Men, Rodents and living beings

Neelam, who is Deepak's daughter, says to Deepika, Your mother Rekha is the younger sister of my father who is the third child of Ramlal." How is Ramisl related to Deepika ? 

Tractor : Trailer :: Horse : ?

Sword : Slaughter : : Scalpel : ?

If a meaningful word can be formed using the five letters NWROD each only once, then the fourth letter of that word is your answer. If more than one such word can be formed then Y is your answer, and if no such word can be formed then 'Z' is your answer.