Linear Data Structure, Tree, OOPS Concept, Operating System, Database management system, Computer networks, LinkedList, Arrays, Strings, trees. Explain your testing process in your current project. How do you design test cases from requirements? Difference between Smoke, Sanity, and Regression testing. Write test cases for: Login page Calculator / elevator / email form How do you find and report defects? What is your test case priority and severity approach? What are waits in Selenium? Explain Page Object Model (if automation involved). SQL query – fetch 2nd highest salary from employee table. What’s your bug tracking tool experience (JIRA, Azure, etc.)?