Update Interview_Questions.md

Author: Amogh Singhal

Interview_Questions.md

@@ -6,3 +6,12 @@ Solution: Start with two pointer `p` and `q`. For every second iteration of `p`,
 
 ## 3. How to find the `k th` element from the end of a linked list in one pass
 Solution: Start with two pointer `p` and `q`. When the `p` pointer reahces upto the `k th` element, increment `q`.When `p` reaches the end of the list. `q` is ponting to the element 'k th' from the end.
+
+## 4. List some real world applications of linked list
+Solution:
+
+*Image viewer* – Previous and next images are linked, hence can be accessed by next and previous button.
+
+*Previous and next page in web browser* – We can access previous and next url searched in web browser by pressing back and next button since, they are linked as linked list.
+
+*Music Player* – Songs in music player are linked to previous and next song. you can play songs either from starting or ending of the list.