Infosys Developer interview questions

Tell me something about yourself very briefly. What is AI? What is IOT? can you write a code for palindrome check? as I am a mechanical engineer, I was not able to answer correctly. So i told him that i studied basic C and data structure in my very first year of college so this time i am not able to recall those things, please ask me something from mechanical. Than he started again-- Draw SFD and BMD for a given condition. find reactions of Truss. Find deflection.... and at this point i did blunder by giving all answer correctly. so he said that you are the guy not for our industry. And gave me a suggestion to join a core company and came back after 10 years. Finally i was not selected.