Verbal Reasoning - Mental Ability Questions

In the following question, select the related letters from the given alternatives.
YONEX : DUUMG : : JASPO : ?

If "+" means "minus", "x" means "divided by", "÷" means "plus" and "-" means "multiplied by", then
300 x 10 – 5 + 36 ÷ 57 = ?

In a certain code language, "OCEAN" is written as "PEHES". How is "RIVER" written in that code language?

Ms. X's husband is the only son of Ms. Y's mother. If Ms. X's brother and Ms. Y's husband are cousins, then Ms. X is Ms. Y's ____.

Rampal told Arjun, "Yesterday I defeated the only brother of the daughter of my grandmother." Whom did Rampal defeat?

Savage : Civilized :: ____ : ____

Among four books, Book1 is twice as heavy as Book 2. Book 3's weight is half of Book 2's weight. Book 4 is 60 grams more as compared to Book 2 but 60 grams less as compared Book 1. Which book is heaviest?

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

XY, UV, RS, OP, ?