If a four-letter meaningful word is formed by using of 1st, 4th, 7th and 10th letter from left end of the word ‘INTERSTELLAR’, then what will be the second letter from right end of that meaningful word. If more than one meaningful word is formed, mark the answer as Y and if no meaningful word is formed, mark the answer as Z.

To solve this problem, we need to extract specific letters from the word "INTERSTELLAR" and determine if any meaningful four-letter words can be formed from them.

First, let's identify the letters of the word INTERSTELLAR based on their positions from the left end:
1st letter: I
2nd letter: N
3rd letter: T
4th letter: E
5th letter: R
6th letter: S
7th letter: T
8th letter: E
9th letter: L
10th letter: L
11th letter: A
12th letter: R

The extracted letters at the 1st, 4th, 7th, and 10th positions are I, E, T, and L.

Next, we check what meaningful English words can be formed using each of these four letters exactly once:
1. LITE (meaning of low density, low calorie, or a variant of light)
2. TILE (a thin square or rectangular plate used for covering roofs, floors, or walls)

Since we can form more than one meaningful English word (both "LITE" and "TILE" are valid), according to the instructions, we must mark the answer as Y.

Therefore, the correct answer option is Y.