Verbal Reasoning - Mental Ability Questions

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

aa_ab_ _aaa _a

If "A" means "plus", "B" means "divide", "C" means "multiply" and "D" means "minus", then 180 B 36 C 5 A 8 D 32 = ?

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

25 ÷ 2 - 10 + 10 x 6 = ?

Select the odd letters from the given alternatives.

If 18α12 = 3, 2α14 = -6 and 4α4 = 0, then find the value of 2α16 = ?

In a certain code language, “FIR” is written as “33” and “LIT” is written as “41”. How is “TOM” written in that code language?

In a certain code language, “MOTOR” is written as “ORXTX”. How is “GUARD” written in that code language?

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., 'U' can be represented by 01, 12, etc., and 'L' can be represented by 56, 67, etc. Similarly you have to identify the set for the word 'SPARE'.