Interview questions

124 questions found

• What is C and why is it still used?CBeginner
• What are the basic data types in C?CBeginner
• What is the difference between declaration and definition?CBeginner
• What is the difference between = and ==?CBeginner
• What are header files used for?CBeginner
• What is the difference between while and do-while?CBeginner
• What is an array?CBeginner
• What is a pointer?CIntermediate
• What is pointer arithmetic?CIntermediate
• What is the difference between malloc and calloc?CIntermediate
• What is a memory leak and how do you avoid it?CIntermediate
• What is a dangling pointer?CIntermediate
• What is the difference between struct and union?CIntermediate
• What is the difference between call by value and call by reference?CIntermediate
• What does the static keyword do?CIntermediate
• What is the difference between const and #define?CIntermediate
• How are strings represented in C?CIntermediate
• What is the difference between strcpy and strncpy?CIntermediate
• What are storage classes in C?CIntermediate
• What is recursion? Give a trade-off.CIntermediate
• What is a function pointer and where is it useful?CAdvanced
• Explain the difference between stack and heap memory.CAdvanced
• What is undefined behaviour? Give examples.CAdvanced
• What are the stages of compilation in C?CAdvanced
• What is a segmentation fault and how do you debug it?CAdvanced
• What is the difference between JDK, JRE and JVM?JavaBeginner
• Why is Java called platform independent?JavaBeginner
• What are the four pillars of OOP?JavaBeginner
• What is the difference between a class and an object?JavaBeginner
• What is a constructor?JavaBeginner
• What is the difference between overloading and overriding?JavaBeginner
• What are access modifiers in Java?JavaBeginner
• What is the difference between String, StringBuilder and StringBuffer?JavaBeginner
• What is the difference between an abstract class and an interface?JavaIntermediate
• Explain the Java Collections hierarchy.JavaIntermediate
• What is the difference between ArrayList and LinkedList?JavaIntermediate
• How does HashMap work internally?JavaIntermediate
• What is the difference between HashMap and Hashtable?JavaIntermediate
• Why must equals and hashCode be overridden together?JavaIntermediate
• What is the difference between checked and unchecked exceptions?JavaIntermediate
• What is the purpose of the finally block?JavaIntermediate
• What is the difference between final, finally and finalize?JavaIntermediate
• What is the static keyword used for in Java?JavaIntermediate
• What is the difference between == and equals()?JavaIntermediate
• What are generics and why use them?JavaIntermediate
• What is autoboxing?JavaIntermediate
• What is a lambda expression?JavaIntermediate
• What is the Stream API used for?JavaIntermediate
• What is the difference between an interface and a functional interface?JavaIntermediate
• Explain the Java memory model areas.JavaAdvanced
• How does garbage collection work in Java?JavaAdvanced
• What is the difference between synchronized and volatile?JavaAdvanced
• What is a deadlock and how do you prevent it?JavaAdvanced
• What is dependency injection?JavaAdvanced
• What is the difference between Comparable and Comparator?JavaAdvanced
• What are Python's key features?PythonBeginner
• What is the difference between a list and a tuple?PythonBeginner
• What is a dictionary?PythonBeginner
• What is the difference between is and ==?PythonBeginner
• How do you handle exceptions in Python?PythonBeginner
• What is indentation used for in Python?PythonBeginner
• What are *args and **kwargs?PythonBeginner
• What is a module and a package?PythonBeginner
• What is a list comprehension?PythonIntermediate
• What is a generator?PythonIntermediate
• What is a decorator?PythonIntermediate
• What is the difference between shallow and deep copy?PythonIntermediate
• What are Python's mutable and immutable types?PythonIntermediate
• What does self refer to?PythonIntermediate
• What is the difference between a class method and a static method?PythonIntermediate
• What are dunder methods?PythonIntermediate
• How does Python manage memory?PythonIntermediate
• What is a virtual environment and why use one?PythonIntermediate
• What is the difference between append and extend?PythonIntermediate
• What is a context manager?PythonIntermediate
• What is the difference between range and a list of numbers?PythonIntermediate
• What is the GIL?PythonAdvanced
• What is monkey patching?PythonAdvanced
• Explain MRO in Python.PythonAdvanced
• What is the difference between asyncio and threading?PythonAdvanced
• What is a primary key?SQL & DatabasesBeginner
• What is a foreign key?SQL & DatabasesBeginner
• What is the difference between WHERE and HAVING?SQL & DatabasesBeginner
• What are the main types of JOIN?SQL & DatabasesBeginner
• What is the difference between DELETE, TRUNCATE and DROP?SQL & DatabasesIntermediate
• What is normalisation?SQL & DatabasesIntermediate
• What is an index and what is the trade-off?SQL & DatabasesIntermediate
• What is the difference between UNION and UNION ALL?SQL & DatabasesIntermediate
• What are ACID properties?SQL & DatabasesIntermediate
• What is a stored procedure?SQL & DatabasesAdvanced
• What is the difference between clustered and non-clustered indexes?SQL & DatabasesAdvanced
• How would you find and fix a slow query?SQL & DatabasesAdvanced
• What is the difference between frontend and backend?Full Stack & WebBeginner
• What is an API?Full Stack & WebBeginner
• What are the common HTTP methods?Full Stack & WebBeginner
• What do status codes 200, 201, 400, 401, 404 and 500 mean?Full Stack & WebBeginner
• What is the difference between GET and POST?Full Stack & WebBeginner
• What is responsive design?Full Stack & WebBeginner
• What is REST?Full Stack & WebIntermediate
• What is the difference between authentication and authorization?Full Stack & WebIntermediate
• What is CORS?Full Stack & WebIntermediate
• What is a JWT?Full Stack & WebIntermediate
• What is the difference between cookies, localStorage and sessionStorage?Full Stack & WebIntermediate
• What is the virtual DOM?Full Stack & WebIntermediate
• What is the difference between props and state in React?Full Stack & WebIntermediate
• What are React hooks? Name a few.Full Stack & WebIntermediate
• What is Spring Boot and why is it used?Full Stack & WebIntermediate
• What is an ORM?Full Stack & WebIntermediate
• What is MVC?Full Stack & WebIntermediate
• How would you secure a REST API?Full Stack & WebAdvanced
• How do you improve web application performance?Full Stack & WebAdvanced
• What happens when you type a URL and press Enter?Full Stack & WebAdvanced
• Tell me about yourself.HR & GeneralBeginner
• Why do you want this role?HR & GeneralBeginner
• What are your strengths?HR & GeneralBeginner
• What are your weaknesses?HR & GeneralBeginner
• Walk me through a project you built.HR & GeneralBeginner
• Where do you see yourself in three years?HR & GeneralBeginner
• How do you handle tight deadlines?HR & GeneralIntermediate
• Tell me about a time you failed.HR & GeneralIntermediate
• How do you keep learning new technologies?HR & GeneralIntermediate
• How do you work in a team?HR & GeneralIntermediate
• Do you have any questions for us?HR & GeneralIntermediate
• Why should we hire you?HR & GeneralIntermediate