Exception & Error Handling

Q1. What is an exception?

1. A.A function call to a subroutine in the program
2. B.An abnormal event disrupting normal program flow✓ Correct
3. C.A normal expected program event during execution
4. D.A variable type for storing error code values

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Q2. What is a try-catch block?

1. A.A function definition with parameters and body
2. B.A looping construct for repeated iteration
3. C.A construct attempting code and handling exceptions✓ Correct
4. D.A conditional statement for branching logic

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Q3. What is the purpose of the 'finally' block?

1. A.To define a new function with a specific name
2. B.To terminate the program execution immediately
3. C.To execute code regardless of exception outcome✓ Correct
4. D.To finalize a variable and prevent changes

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Q4. What is a NullPointerException?

1. A.A compile-time syntax error in the code
2. B.A valid and expected operation result
3. C.A warning generated by the code linter
4. D.An exception from using a null reference✓ Correct

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Q5. What does 'throw' do in exception handling?

1. A.Ignores an exception and continues running
2. B.Explicitly raises and creates an exception✓ Correct
3. C.Logs an exception message to the console
4. D.Catches an exception from the try block

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Q6. What is an ArithmeticException?

1. A.A type mismatch between two variable types
2. B.A file not found error during I/O access
3. C.An exception for illegal arithmetic operations✓ Correct
4. D.A syntax error in the source code text

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Q7. What is the difference between compile-time and runtime errors?

1. A.Compile-time errors cause the running program to crash unexpectedly
2. B.Runtime errors are detected and caught by the compiler before running
3. C.Compile-time errors are caught before execution; runtime during it✓ Correct
4. D.There is no meaningful difference between the two error types

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Q8. What is an ArrayIndexOutOfBoundsException?

1. A.A type error from wrong array element types
2. B.An exception for accessing an invalid index✓ Correct
3. C.A memory leak from unreleased array memory
4. D.A valid and expected array access result

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Q9. Can you have multiple catch blocks for one try?

1. A.Yes, to handle different exception types differently✓ Correct
2. B.No, only one catch block is allowed per try statement
3. C.Only for a maximum of exactly two exception types total
4. D.Only in Python, not in any other programming language

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Q10. What is an error message?

1. A.A variable name used for storing error data
2. B.A text description about what went wrong✓ Correct
3. C.A function output returned to calling code
4. D.A comment written inside the source code

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Q11. What is the difference between checked and unchecked exceptions in Java?

1. A.Unchecked exceptions are always more severe than checked exceptions
2. B.Checked exceptions are always faster to handle than unchecked ones
3. C.Checked must be declared or caught; unchecked RuntimeExceptions do not✓ Correct
4. D.There is no meaningful difference between the two exception types

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Q12. What is exception propagation?

1. A.Unhandled exception moving up the call stack to find a handler✓ Correct
2. B.Fixing an exception by catching and logging it
3. C.Logging all exceptions to a file for later review and analysis
4. D.Throwing multiple exceptions at the same time from one method

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Q13. What is a custom exception?

1. A.A user-defined exception class for domain-specific errors✓ Correct
2. B.A syntax error detected during the compilation process
3. C.A warning generated by the IDE during code development
4. D.A built-in exception provided by the language runtime

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Q14. What is the 'throws' keyword in Java?

1. A.A keyword for suppressing exceptions so they are ignored
2. B.A mechanism for catching and handling thrown exceptions
3. C.It is exactly the same as the throw keyword in Java
4. D.A declaration of which checked exceptions a method may throw✓ Correct

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Q15. What is a stack trace?

1. A.A log file containing all program output and error data
2. B.The call stack data structure itself in memory
3. C.A memory dump of the entire program state at crash
4. D.A report showing the method call chain to an exception✓ Correct

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Q16. What is the purpose of try-with-resources in Java?

1. A.To automatically close resources when the try block finishes✓ Correct
2. B.To try executing multiple methods in parallel simultaneously
3. C.To retry the try block harder if the first attempt fails
4. D.To allocate additional resources for the try block execution

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Q17. What is the difference between Error and Exception in Java?

1. A.Errors are serious JVM problems; Exceptions are recoverable issues✓ Correct
2. B.Exceptions cannot be caught or handled by any catch block
3. C.They are the same thing with no meaningful differences at all
4. D.Errors are less serious and easier to handle than Exceptions

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Q18. What is a try-except-else block in Python?

1. A.An advanced loop construct for iterating with error handling
2. B.try runs risky code; except handles; else runs if no exception✓ Correct
3. C.Invalid syntax that causes a compilation error
4. D.A triple try block for handling three exceptions at once

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Q19. What is exception chaining?

1. A.Throwing many exceptions at the same time from one method call
2. B.Catching exceptions in a specific order from most to least severe
3. C.Wrapping one exception inside another to preserve original cause✓ Correct
4. D.A linked list of error objects stored in chronological order

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Q20. What is the principle of 'fail fast'?

1. A.Testing the speed of program execution under various load levels
2. B.Detecting and reporting errors as soon as they occur in the program✓ Correct
3. C.Making programs crash as quickly as possible for testing purposes
4. D.Running programs as quickly as possible to improve the performance

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Q21. What is the difference between fault tolerance and exception handling?

1. A.Exception handling prevents all errors from ever occurring in the program
2. B.Exception handling manages code errors; fault tolerance is system resilience✓ Correct
3. C.They are exactly the same concept with no practical differences at all
4. D.Fault tolerance is always faster and easier to implement than exceptions

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Q22. What is an exception safety guarantee?

1. A.A guarantee that no exceptions will ever occur in the program
2. B.Levels of state guarantees after exception: no-throw, strong, basic✓ Correct
3. C.A compiler feature that eliminates all runtime exceptions automatically
4. D.A testing tool that verifies exception handlers work correctly always

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Q23. What is the 'catch-all' anti-pattern?

1. A.A testing pattern for verifying exception handler correctness
2. B.Catching all exceptions generically which hides bugs in code✓ Correct
3. C.Catching only specific well-defined exceptions in the code
4. D.A recommended design pattern for robust exception handling

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Q24. What is the difference between recoverable and unrecoverable errors?

1. A.There is no meaningful difference between the two error categories
2. B.All errors in every program are always recoverable with proper code
3. C.All errors in every program are always unrecoverable without fixes
4. D.Recoverable errors can be handled; unrecoverable require termination✓ Correct

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Q25. What is Result/Either type as an alternative to exceptions?

1. A.A logging mechanism for recording exception messages
2. B.A type representing either success value or error value✓ Correct
3. C.A direct replacement for try-catch in all situations
4. D.A simple boolean type with true or false values

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Q26. What is the problem with exceptions and concurrency?

1. A.Exceptions in one thread may not be visible in another thread✓ Correct
2. B.No problems exist between exceptions and concurrency at all
3. C.Concurrency completely prevents all exceptions from occurring
4. D.Exceptions are inherently thread-safe in all implementations

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Q27. What is a panic in Rust/Go?

1. A.A regular exception like any other in the language
2. B.A warning message that can be safely ignored by developers
3. C.An unrecoverable error that unwinds the stack and terminates✓ Correct
4. D.A debug log entry recorded during program execution review

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Q28. What is structured concurrency's approach to exception handling?

1. A.Ignoring all exceptions thrown by child tasks completely
2. B.Propagating child exceptions to parent and cancelling siblings✓ Correct
3. C.Logging exceptions only without any propagation to parents
4. D.Catching all exceptions silently without any further action

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Q29. What is the difference between resumable and non-resumable exceptions?

1. A.Resumable allows continuing at throw point; non-resumable unwinds✓ Correct
2. B.There is no meaningful difference between the two exception types
3. C.Non-resumable exceptions can be resumed after the handler finishes
4. D.Resumable exceptions are always slower than non-resumable exceptions

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Q30. What is the 'exception specification' problem in C++?

1. A.Exception specifications are completely reliable and always enforced
2. B.They always improve performance of exception handling in all cases
3. C.They are required by the C++ standard for every function definition
4. D.C++ throw() specs were problematic and replaced by noexcept keyword✓ Correct

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