Verbal Reasoning - Mental Ability Questions

How many such pairs of letters are there in the word REGIONAL, each of which has as many letters between them in the word (in both forward and backward directions) as they have between them in the English alphabetical series ?

In a row of students, if John , who is 16th from the left, and Johnson, who is 8th from the right, interchange their positions, John becomes 33rd from left. How many students are there in a row?

In the following question, select the related number from the given alternatives.
40 : 100 : : 56 : ?

In the following question, select the odd number pair from the given alternatives.

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

In the following question, select the number which can be placed at the sign of ? from the given alternatives.

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

8,24,12,?,18,54

If + means division, ­ means multiplication, '÷' means subtraction, x means addition, and < means less than, then which of the following is false?