IBM Internship interview questions

These were for IBM ISDL : First Round : It will be an online round with two section with internal timer for each question. First Section - Sequence and Series Completion kind . Second Section - Aptitude qstns Second Round : It is written round where the questions will be from all cse topics and there was seperate paper for hardware opting people Third Round : face to face interview . Questions from Data Structures and Operating Systems Fourth Round : HR interview