Programming and Flutter Assessment (30 Questions) PDF

Advanced Programming and Flutter Assessment Questions ===================================================== Q1. 1. What is the final output of the following code? - a\) 15 - b\) 510 - c\) Runtime Error - d\) Compilation Error Answer: c) Runtime Error Q2. 2. What is the difference betw...

Advanced Programming and Flutter Assessment Questions ===================================================== Q1. 1. What is the final output of the following code? - a\) 15 - b\) 510 - c\) Runtime Error - d\) Compilation Error Answer: c) Runtime Error Q2. 2. What is the difference between \`final\` and \`const\` in Dart? - a\) \`final\` is used for compile-time constants only - b\) \`const\` refers to runtime constants only - c\) \`const\` is for compile-time constants, and \`final\` values can change - d\) \`final\` is used for runtime constants, while \`const\` is for compile-time constants Answer: d) \`final\` is used for runtime constants, while \`const\` is for compile-time constants Q3. 3. What happens when the following code is executed? - a\) \[10, 2, 3\] - b\) \[1, 2, 3\] - c\) Compile-time Error - d\) Runtime Error Answer: d) Runtime Error Q4. 4. What is the output of the following code? - a\) 0 1 2 3 4 - b\) 0 1 2 - c\) 0 1 2 3 - d\) Nothing Answer: b) 0 1 2 Q5. 5. What does the following code do? - a\) 1 2 3 4 5 - b\) 1 2 4 5 - c\) 1 2 3 - d\) 1 3 4 5 Answer: b) 1 2 4 5 Q6. 6. What happens when the following code is executed? - a\) Prints \'Start\' and \'End\' - b\) Prints only \'Start\' - c\) Prints only \'End\' - d\) Prints nothing Answer: b) Prints only \'Start\' Q7. 7. Which of the following is the correct way to define a function with optional parameters? - a\) \`void greet(String name, \[int age\])\` - b\) \`void greet(String name, {int age})\` - c\) \`void greet(String name, {required int age})\` - d\) \`void greet(String name, optional int age)\` Answer: b) \`void greet(String name, {int age})\` Q8. 8. What does the following code do? - a\) 15 - b\) Compile-time Error - c\) Runtime Error - d\) Nothing Answer: a) 15 Q9. 9. What is the difference between a \`factory\` and a regular constructor? - a\) \`factory\` cannot be used to create a new object - b\) \`factory\` is used to dynamically create objects - c\) \`factory\` always returns a new object - d\) \`factory\` is used to create objects without a constructor Answer: b) \`factory\` is used to dynamically create objects Q10. 10. What is the output of the following code? - a\) Hello from Parent - b\) Hello from Child - c\) Compile-time Error - d\) Runtime Error Answer: b) Hello from Child Q11. 11. What is the output of the following code? - a\) Fetching\... Done Data Fetched - b\) Fetching\... Data Fetched Done - c\) Done Fetching\... Data Fetched - d\) Data Fetched Fetching\... Done Answer: a) Fetching\... Done Data Fetched Q12. 12. Which of the following is true about \`Stream\`? - a\) It can handle only one value - b\) It can handle multiple sequential values - c\) It must always be used with \`await\` - d\) It stops automatically when finished Answer: b) It can handle multiple sequential values Q13. 13. What is the difference between \`on\` and \`catch\` in error handling? - a\) \`on\` specifies the type of error, while \`catch\` handles any error - b\) \`catch\` specifies the type of error, while \`on\` handles general errors - c\) There is no difference between them - d\) They cannot be used together Answer: a) \`on\` specifies the type of error, while \`catch\` handles any error Q14. 14. What happens when the following code is executed? - a\) Cannot divide by zero - b\) Error: IntegerDivisionByZeroException - c\) Compile-time Error - d\) Nothing Answer: a) Cannot divide by zero Q15. 15. How do you handle nullable types in Dart? - a\) By adding \`?\` after the type - b\) By using \`late\` - c\) By adding \`\@nullable\` annotation - d\) By declaring the variable as \`dynamic\` Answer: a) By adding \`?\` after the type Q16. 16. What happens when you use \`late\` on a variable but never initialize it? - a\) It throws a compile-time error - b\) It remains uninitialized - c\) It throws a runtime error when accessed - d\) It gets initialized with a default value Answer: c) It throws a runtime error when accessed Q17. 17. How can you create an immutable list in Dart? - a\) Using \`const\` - b\) Using \`final\` - c\) Using \`immutable\` - d\) Using \`readonly\` Answer: a) Using \`const\` Q18. 18. What is the output of the following code? - a\) 3 - b\) 3.333\... - c\) 4 - d\) Compile-time Error Answer: a) 3 Q19. 19. Which Dart collection allows storing unique elements? - a\) List - b\) Map - c\) Set - d\) Queue Answer: c) Set Q20. 20. What is the purpose of \`typedef\` in Dart? - a\) To define custom data types - b\) To create type aliases for function signatures - c\) To create abstract classes - d\) To enable generics Answer: b) To create type aliases for function signatures Q21. 21. What is the purpose of the \`build\` method in a Flutter widget? - a\) To initialize state - b\) To build the widget tree - c\) To handle user input - d\) To manage navigation Answer: b) To build the widget tree Q22. 22. Which widget is used to create a scrollable list in Flutter? - a\) \`Column\` - b\) \`ListView\` - c\) \`Stack\` - d\) \`Row\` Answer: b) \`ListView\` Q23. 23. What is the difference between \`StatelessWidget\` and \`StatefulWidget\`? - a\) \`StatelessWidget\` manages state, \`StatefulWidget\` does not - b\) \`StatefulWidget\` manages state, \`StatelessWidget\` does not - c\) Both manage state - d\) None of the above Answer: b) \`StatefulWidget\` manages state, \`StatelessWidget\` does not Q24. 24. How can you pass data between screens in Flutter? - a\) Using a constructor - b\) Using a global variable - c\) Using Navigator arguments - d\) All of the above Answer: d) All of the above Q25. 25. What does the \`setState\` method do in Flutter? - a\) Rebuilds the widget tree - b\) Updates the state variable directly - c\) Navigates to a new screen - d\) None of the above Answer: a) Rebuilds the widget tree Q26. 26. Which of the following widgets is used to handle user gestures in Flutter? - a\) \`GestureDetector\` - b\) \`Container\` - c\) \`Scaffold\` - d\) \`Row\` Answer: a) \`GestureDetector\` Q27. 27. How do you make an API request in Flutter? - a\) Using the \`http\` package - b\) Using the \`Navigator\` package - c\) Using the \`async\` package - d\) Using the \`StreamBuilder\` widget Answer: a) Using the \`http\` package Q28. 28. What is the role of the \`Scaffold\` widget in Flutter? - a\) It provides a structure for the app\'s layout - b\) It handles navigation between screens - c\) It manages user inputs - d\) It defines app-wide themes Answer: a) It provides a structure for the app\'s layout Q29. 29. How do you add padding around a widget in Flutter? - a\) Using the \`Padding\` widget - b\) Using the \`Container\` widget - c\) Using the \`Row\` widget - d\) Using the \`ListView\` widget Answer: a) Using the \`Padding\` widget Q30. 30. What is the purpose of the \`FutureBuilder\` widget in Flutter? - a\) To display loading indicators - b\) To handle asynchronous data and update the UI accordingly - c\) To handle state management - d\) To manage navigation Answer: b) To handle asynchronous data and update the UI accordingly