Questions : -> Reverse a linked list ->Reverse a linked list in batches of three nodes ->Basic Android, Service, Messenger,Handler question. ->Hashmap , ways of conflict handling in hasmap ->Content Providers ->Tower of hanoi problem ->Questions on Trees , find the right adjacent node for any given node ->distance from node to another in tree -> questions on strings, find if the string is a palindrome, reversing a string, finding duplicates ->Lock, mutex question, implement read-write lock,