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 ?

At hill stations, the boiling point of water will be

The layer where the decrease in temperature with increasing altitude is totally absent is

What is the main purpose of white blood corpuscles?

Sun appears red in colour at sunrise and sunset due to

Which of the following uses the spawn mechanism to duplicate itself ?

Which is the heaviest metal among the following?

In this question, the sets of numbers given in the alternatives are represented. 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., D can be represented by 04,12, etc., and 'I' can be represented by 65, 79, etc. Similarly you have to identify the set for the word 'BANK'.