Verbal Reasoning - Mental Ability Questions

From the given alternative words, select the word which cannot be formed using the letters of the given word:
ECCENTRICITY

Courtroom : Judge :: Stadium : ___

Find the odd word/letters/number from the given alternatives.

If O = 15 and STAR = 58 then CAMEL = ?

Malini said, "Rohit is my maternal aunt's mother's only son's son". How is Malini related to Rohit?

The age of the father 4 years ago was 8 times the age of his son. At present, the father's age is 4 times that of his son. Find the present age of son.

From the given alternative words, select the word which cannot be formed using the letters of the given word :

ORGANISATION

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

2, 5, 12, 27, ?