Verbal Reasoning - Mental Ability Questions

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.
Biological

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

HI, MN, RS, ?

From point A, Ram moves 100m in north ­east direction, he again turns and moves 100m in south­east direction. He again turns and covers 100m south-west and finally covers 100m in north­ west direction. In which direction is he now with respect to A?

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

5 ÷ 4 ­ 10 + 7 x 16 = ?

In a certain code language, if COTTON is coded as 325526 and WOOLEN is coded as 122976, then TOWEL will be coded as?

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

Select the missing letter from the given responses?

In the following question, select the related word from the given alternatives.
Ampere : Electric current : : Fathom : ?