Verbal Reasoning - Mental Ability Questions

Find the odd word/letters/number pair from the given alternatives.
(A) Violin
(B) Piano
(C) Flute
(D) Harmonium

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

DEC, HIG, LMK, PQO, TUS, ?

In a certain code language, '-' represents 'x', '÷' represents '+', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question.

9 ÷ 12 - 15 + 4 x 10 = ?

In a certain code language, "DISORDER" is written as "OSIDREDR". How is "PRACTICE" written in that code language?

In a certain code language, "REMINDER" is written as "SFNJMCDQ". How is "STANDARD" written in that code language?

There is certain relationship between two given words on one side of : : and one word is given on another side of : : while another word is to be found from the given alternatives, having the same relation with this word as the given pair has. Select the best alternatives/ relationship.

Contamination : Food :: Infection : ?

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

5, 30, 155, 780, ?

If 10$25 = 8, 12$25 = 10 then what is the value of 14$53 = ?