Verbal Reasoning - Mental Ability Questions

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

5 + 10 x 21 ÷ 5 - 15 = ?

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

DHARAMSALA

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

Nitrogen fixation, Ammonification, Nitrification, ?

Mr. X starts from point A travels 80 km towards west, takes a left turn, travels 50 km and reaches point B. What is the shortest distance between points A and B ?

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

R, M, I, F, D, ?

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

ZBJ, YCK, XDL, ?

In the question, a word is represented by only one set of numbers as given in any one of the alternatives. The sets of numbers given in the alternatives are represented by two classes of alphabets as in two matrices given below. The columns and rows of Matrix I are numbered from 0 to 4 and that of Matrix II are numbered from 5 to 9. A letter from these matrices can be represented first by its row and next by its column, e.g., 'C' can be represented by 21, 43, etc. and 'U' can be represented by 75, 98 etc. You have to identify the set for the word 'ROAD'.

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series. 1,3,7,13,21,?