Verbal Reasoning - Mental Ability Questions

Select the related word/letters/number from the given alternatives.
Frog : Amphibian : : Cobra : ?

If IMPLORE is coded as GKNJMPC, then how will HUB be coded as?

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, ?

In the English alphabet, which letter is 13th from right end?

In the following question, by using which mathematical operator will the expression become correct?
18 ? 6 ? 9 ? 27

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?

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

If S = 19, SUN = 54 and CAKE = 20 , then MISTAKE = ?