Obsessory Trainee Data Analyst interview questions

In interview they asked questions 1. Write test cases for ceiling fan. 2. what is structured data and unstructured 3. Tell about yourself. 4. Gave me test case of cab with table of cab no, driver name, trip start time, trip end time and driver duty start time and end time. Asked to draw analysis out of this info. 5. final round was with MD over skype and he also asked many questions based on CV and some test ceases. how you ensure quality data from vendor. how to check data is updated or not.