Chapter Exam

Chapter-1 Exception Handling in Python — Online MCQ Test

Q: Which keyword is used to catch an exception in Python?

Answer: C. except — The 'except' keyword is used in Python to catch and handle exceptions that occur in the try block.

Q: What is the purpose of the 'try' block?

Answer: B. To contain code that might raise an exception — The try block contains the code that might potentially raise an exception during execution.

Q: Which of the following is a runtime error in Python?

Answer: C. ZeroDivisionError — ZeroDivisionError is a runtime error that occurs when attempting to divide a number by zero during program execution.

Q: Which exception would be caught by 'except (ValueError, TypeError):'?

Answer: C. Either ValueError or TypeError — Using a tuple of exception types allows catching multiple specific exceptions in a single except block.

Q: What is the output of this code? try: raise ValueError('Invalid value') except ValueError as e: print(f'Caught: {e}') finally: print('Cleanup')

Answer: A. Caught: Invalid value\nCleanup — The ValueError is raised and caught, printing 'Caught: Invalid value', then finally block executes printing 'Cleanup' on a new line.

Q: Which code will NOT raise an exception when executed?

Answer: C. z = (1, 2, 3)[1] — Accessing index 1 of tuple (1,2,3) returns 2 and executes without error, while other options raise ValueError, KeyError, and ZeroDivisionError respectively.

COMPUTER SCIENCE · Grade 12 · CBSE(NCERT)

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Chapter-1 Exception Handling in Python — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 12 COMPUTER SCIENCE — Chapter-1 Exception Handling in Python, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is an exception in Python?

A. A type of loop used in programming
B. An event that occurs during program execution that disrupts the normal flow of the program ✓
C. A function that always returns an error
D. A variable that stores error messages

Answer: B. An event that occurs during program execution that disrupts the normal flow of the program
An exception is an error event that disrupts normal program execution, which Python handles using exception handling mechanisms.

Which keyword is used to catch an exception in Python?

A. catch
B. handle
C. except ✓
D. error

Answer: C. except
The 'except' keyword is used in Python to catch and handle exceptions that occur in the try block.

What is the purpose of the 'try' block?

A. To define a function
B. To contain code that might raise an exception ✓
C. To repeat code multiple times
D. To create a loop structure

Answer: B. To contain code that might raise an exception
The try block contains the code that might potentially raise an exception during execution.

Which of the following is a runtime error in Python?

A. Syntax error
B. IndentationError
C. ZeroDivisionError ✓
D. NameError in import statement

Answer: C. ZeroDivisionError
ZeroDivisionError is a runtime error that occurs when attempting to divide a number by zero during program execution.

What happens if an exception is not caught in a try-except block?

A. The program continues normally
B. The program terminates and displays an error message ✓
C. The program ignores the error
D. The program automatically fixes the error

Answer: B. The program terminates and displays an error message
If an uncaught exception occurs, the program terminates and Python displays a traceback showing the error details.

What is the difference between 'except Exception:' and 'except ValueError:'?

A. They are exactly the same
B. Exception catches all exceptions, while ValueError catches only value-related errors ✓
C. ValueError is more general than Exception
D. Exception is outdated and should not be used

Answer: B. Exception catches all exceptions, while ValueError catches only value-related errors
Exception is a base class that catches all exceptions, while ValueError specifically catches exceptions related to invalid values.

Which exception would be caught by 'except (ValueError, TypeError):'?

A. Only ValueError
B. Only TypeError
C. Either ValueError or TypeError ✓
D. None of the above

Answer: C. Either ValueError or TypeError
Using a tuple of exception types allows catching multiple specific exceptions in a single except block.

What happens when an exception occurs in the finally block?

A. It is ignored
B. It propagates up and can replace the original exception ✓
C. It is automatically caught
D. The program restarts

Answer: B. It propagates up and can replace the original exception
If an exception occurs in the finally block, it propagates up and can replace or mask the original exception from the try block.

What is the output of this code? try: raise ValueError('Invalid value') except ValueError as e: print(f'Caught: {e}') finally: print('Cleanup')

A. Caught: Invalid value\nCleanup ✓
B. Cleanup
C. Caught: Invalid value
D. Invalid value

Answer: A. Caught: Invalid value\nCleanup
The ValueError is raised and caught, printing 'Caught: Invalid value', then finally block executes printing 'Cleanup' on a new line.

Which code will NOT raise an exception when executed?

A. x = int('123abc')
B. y = {'a': 1}['b']
C. z = (1, 2, 3)[1] ✓
D. w = 5 / 0

Answer: C. z = (1, 2, 3)[1]
Accessing index 1 of tuple (1,2,3) returns 2 and executes without error, while other options raise ValueError, KeyError, and ZeroDivisionError respectively.

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Chapter-2 File Handling in Python