MCQs

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Overall MCQs for Reference

1. Which Python statement is commonly used for exception handling?
   a. switch
   b. break
   c. try-except
   d. loop
   Answer: c. try-exceptdatacamp+1​
2. What is the main purpose of exception handling in machine learning code?
   a. To make code run faster
   b. To ignore errors
   c. To ensure program robustness
   d. To close files
   Answer: c. To ensure program robustnessjinaldesai+1​
3. Which exception is raised when dividing by zero in Python?
   a. ValueError
   b. KeyError
   c. IndexError
   d. ZeroDivisionError
   Answer: d. ZeroDivisionErrorpython-course+1​
4. When loading a dataset in Python, which exception should you handle if the file is missing?
   a. TypeError
   b. FileNotFoundError
   c. ValueError
   d. SyntaxError
   Answer: b. FileNotFoundErrordatacamp+1​
5. What block executes code regardless of whether an exception was raised in Python?
   a. except
   b. break
   c. continue
   d. finally
   Answer: d. finallytestbook+1​
6. Which of the following is NOT a best practice for exception handling?
   a. Log errors
   b. Ignore errors
   c. Use meaningful messages
   d. Catch specific exceptions
   Answer: b. Ignore errorsgeeksforgeeks+1​
7. What happens if an exception is not handled in a machine learning script?
   a. The script continues running
   b. The script terminates
   c. The error is ignored
   d. The output is saved
   Answer: b. The script terminatesjinaldesai+1​
8. Which error commonly arises during data type conversion?
   a. IndexError
   b. ValueError
   c. KeyError
   d. NameError
   Answer: b. ValueErrorpython-course+1​
9. What is the role of the ‘assert’ statement in Python?
   a. Catch exceptions
   b. Test conditions
   c. Print errors
   d. Open files
   Answer: b. Test conditionspython-course​
10. Which exception handles missing values during data preprocessing in machine learning?
    a. NullValueError
    b. KeyError
    c. ValueError
    d. ImportError
    Answer: c. ValueErroryhills+1​
11. In Python, which keyword can be used to manually raise an exception?
    a. throw
    b. bump
    c. raise
    d. except
    Answer: c. raisedatacamp+1​
12. When validating model input types, which error should you anticipate?
    a. ImportError
    b. TypeError
    c. KeyError
    d. FileNotFoundError
    Answer: b. TypeErrorgeeksforgeeks+1​
13. What kind of error results from referencing an undefined variable?
    a. NameError
    b. ValueError
    c. IndexError
    d. KeyError
    Answer: a. NameErrordatacamp+1​
14. How many except clauses can a single try block have in Python?
    a. Only one
    b. Multiple
    c. None
    d. Infinite
    Answer: b. Multipletestbook+1​
15. Which statement about exception handling is true?
    a. Catch blocks must always be present
    b. Only one exception can be handled
    c. Multiple exception types can be handled
    d. Exceptions cannot be caught
    Answer: c. Multiple exception types can be handledtestbook+1​
16. What is the recommended way to log errors during exception handling?
    a. Print to console only
    b. Use logging libraries
    c. Ignore logs
    d. Save to model
    Answer: b. Use logging librariesgeeksforgeeks+1​
17. Which error occurs if you access a list index that doesn’t exist?
    a. ValueError
    b. IndexError
    c. NameError
    d. KeyError
    Answer: b. IndexErrorpython-course+1​
18. When loading data from an external source, which exception should you prepare for?
    a. FileNotFoundError
    b. ImportError
    c. ValueError
    d. AssertionError
    Answer: a. FileNotFoundErrordatacamp+1​
19. What block is always executed after try and except, regardless of exceptions?
    a. except
    b. break
    c. finally
    d. assert
    Answer: c. finallytestbook+1​
20. What exception is common during JSON deserialization?
    a. ValueError
    b. SyntaxError
    c. JSONDecodeError
    d. ImportError
    Answer: c. JSONDecodeErrorpython-course​
21. What is the effect of not catching exceptions in model training?
    a. Model performs better
    b. Code terminates abruptly
    c. Training speeds up
    d. No effect
    Answer: b. Code terminates abruptlyjinaldesai+1​
22. In Python, which block should contain the code that may cause an exception?
    a. except
    b. finally
    c. try
    d. catch
    Answer: c. trydatacamp+1​
23. Which error type is raised if trying to access a key not present in a dictionary?
    a. KeyError
    b. IndexError
    c. ValueError
    d. NameError
    Answer: a. KeyErrorpython-course+1​
24. Which exception handling practice enables reproducible machine learning results?
    a. Ignore exceptions
    b. Document exception handling
    c. Only catch generic errors
    d. Avoid logging
    Answer: b. Document exception handlinglearn.microsoft+1​
25. What is the best way to handle exceptions when reading user input?
    a. Use try-except blocks
    b. Never check input
    c. Use finally block exclusively
    d. Raise errors manually
    Answer: a. Use try-except blocksdatacamp+1​
26. Which exception results from data type mismatches during feature engineering?
    a. ValueError
    b. TypeError
    c. KeyError
    d. FileNotFoundError
    Answer: b. TypeErrorgeeksforgeeks+1​
27. What is a common mistake in exception handling with model deployment?
    a. Not logging errors
    b. Overfitting the model
    c. Ignoring performance
    d. Using only try blocks
    Answer: a. Not logging errorsogmaconceptions+1​
28. Why should you avoid catching exceptions at the highest level?
    a. It makes debugging easier
    b. It hides the source of exceptions
    c. It speeds up execution
    d. It is more secure
    Answer: b. It hides the source of exceptionsgeeksforgeeks​
29. Which block can be used to clean up resources regardless of exception outcomes?
    a. try
    b. finally
    c. except
    d. raise
    Answer: b. finallytestbook+1​
30. What approach handles missing values robustly in a machine learning pipeline?
    a. Drop all missing
    b. Ignore missing values
    c. Use exception handling with imputation
    d. Remove outliers only
    Answer: c. Use exception handling with imputationyhills+1​
31. Which action should be taken when a model overfits due to data leakage?
    a. Stop training
    b. Ignore errors
    c. Raise exception and fix data splitting
    d. Add more layers
    Answer: c. Raise exception and fix data splittinggeeksforgeeks+1​
32. What exception is likely if a function expects a string but gets an integer?
    a. KeyError
    b. TypeError
    c. ValueError
    d. NameError
    Answer: b. TypeErrorgeeksforgeeks+1​
33. What is the outcome of an unhandled exception in a production ML system?
    a. Continued operation
    b. User error notification
    c. System crash or failure
    d. Model is saved anyway
    Answer: c. System crash or failurejinaldesai+1​
34. Which option best describes ‘try-except-finally’ structure’s functionality?
    a. Tries code, handles errors, cleans up
    b. Ignores errors, cleans up
    c. Only cleans resources
    d. None of the above
    Answer: a. Tries code, handles errors, cleans uppython-course+1​
35. What kind of exception might occur if feature scaling uses an undefined method?
    a. TypeError
    b. AttributeError
    c. ValueError
    d. IndexError
    Answer: b. AttributeErrordatacamp+1​
36. How should exceptions be managed in collaborative ML environments?
    a. Ignore errors
    b. Communicate and document errors
    c. Hide logs
    d. Remove try blocks
    Answer: b. Communicate and document errorsgeeksforgeeks+1​
37. Which error arises if you pass unsupported parameters to a model constructor?
    a. ValueError
    b. TypeError
    c. KeyError
    d. AttributeError
    Answer: a. ValueErrorpython-course+1​
38. What exception often occurs in classification tasks with imbalanced datasets?
    a. OverfittingError
    b. TypeError
    c. ValueError
    d. DataImbalanceError
    Answer: c. ValueErroryhills+1​
39. What is a good habit when handling exceptions for model inference?
    a. Handle exceptions but show user-friendly messages
    b. Only catch default exceptions
    c. Ignore error outputs
    d. Automatically re-run inference
    Answer: a. Handle exceptions but show user-friendly messageslearn.microsoft+1​
40. Why use specific exception classes for different errors?
    a. Improve readability and recovery
    b. Slow down code
    c. Hide the exception source
    d. None of the above
    Answer: a. Improve readability and recoverylearn.microsoft+1​
41. What error occurs if incorrect dimension data is fed to a neural network?
    a. IndexError
    b. ValueError
    c. TypeError
    d. AttributeError
    Answer: b. ValueErrordatacamp+1​
42. Why log exceptions with detailed messages in ML?
    a. To speed up training
    b. For easier debugging
    c. To ignore errors
    d. To reduce memory
    Answer: b. For easier debugginggeeksforgeeks+1​
43. What is the appropriate way to handle exceptions during automated ML evaluation?
    a. Use try-except around evaluation code
    b. Skip exception handling
    c. Only print errors
    d. Stop the script
    Answer: a. Use try-except around evaluation codepython-course+1​
44. Which exception is thrown by NumPy for out-of-bounds indices?
    a. ValueError
    b. IndexError
    c. TypeError
    d. NameError
    Answer: b. IndexErrordatacamp+1​
45. When should you avoid raising exceptions in ML code?
    a. Inside finally block
    b. In main function
    c. Inside try block
    d. In code comments
    Answer: a. Inside finally blocklearn.microsoft+1​
46. What error is typical when accessing CSV columns that do not exist?
    a. KeyError
    b. IndexError
    c. ValueError
    d. ImportError
    Answer: a. KeyErrorpython-course+1​
47. What exception arises if a file can’t be accessed for logging ML outputs?
    a. FileNotFoundError
    b. IndexError
    c. TypeError
    d. NameError
    Answer: a. FileNotFoundErrordatacamp+1​
48. What kind of exception should be caught when importing unavailable libraries?
    a. KeyError
    b. ImportError
    c. IndexError
    d. AttributeError
    Answer: b. ImportErrorpython-course+1​
49. How does exception handling contribute to better ML model deployment?
    a. By ensuring robustness
    b. By suppressing all errors
    c. By reducing accuracy
    d. By ignoring logs
    Answer: a. By ensuring robustnessgeeksforgeeks+1​
50. Which exception can be raised if input data has missing columns during model prediction?
    a. KeyError
    b. ValueError
    c. TypeError
    d. NameError
    Answer: a. KeyErrordatacamp+1​

1. https://www.datacamp.com/tutorial/exception-handling-python
2. https://python-course.eu/python-tutorial/errors-and-exception-handling.php
3. https://jinaldesai.com/error-handling-and-debugging-interview-questions/
4. https://testbook.com/objective-questions/mcq-on-exceptions-in-python–60014780ef6e0591dde9be34
5. https://www.geeksforgeeks.org/java/best-practices-to-handle-exceptions-in-java/
6. https://yhills.com/computer-science/machine-learning/learning-mistakes/
7. https://www.geeksforgeeks.org/blogs/common-machine-learning-mistakes/
8. https://learn.microsoft.com/en-us/dotnet/standard/exceptions/best-practices-for-exceptions
9. https://www.ogmaconceptions.com/blogs/7-common-mistakes-in-machine-learning-and-how-to-avoid-them
10. https://www.sanfoundry.com/python-questions-answers-exception-handling/
11. https://www.geeksforgeeks.org/quizzes/python-exception-handling-quiz/
12. https://www.scribd.com/document/608902902/EXCEPTION-HANDLING-MCQ
13. https://www.sanfoundry.com/object-oriented-programming-questions-answers-exception-handling/
14. https://askfilo.com/user-question-answers-smart-solutions/multiple-choice-questions-mcq-1-an-exception-in-python-is-a-3338323931343739
15. https://www.geeksforgeeks.org/machine-learning/machine-learning-interview-questions/
16. https://pythongeeks.org/quizzes/quiz-on-python-exception-handling/
17. https://www.qodo.ai/blog/6-best-practices-for-python-exception-handling/
18. https://www.almabetter.com/bytes/tutorials/python/exception-handling
19. https://www.simplilearn.com/tutorials/machine-learning-tutorial/machine-learning-interview-questions
20. https://interviewkickstart.com/blogs/articles/machine-learning-mcqs-answers