PUC II/ Class XII CBSE/12th State Board Year Exception Handling in Python Questions

 

 

MCQs on Exception Handling in Python

Basics

1. Which of the following is NOT an error type in Python?

a)   Syntax error

b)  Runtime error

c)   Logical error

d)  Debugging error

Answer: d)

2. What is an exception in Python?

a)   A function that fixes errors

b)  A Python object that represents an error

c)   A warning generated by the compiler

d)  A syntax checking method

Answer: b)

3. Syntax errors in Python are also called:

a)   Parsing errors

b)  Runtime errors

c)   Logical errors

d)  System errors

Answer: a)

4. Which error prevents the program from running until it is fixed?

a)   Runtime error

b)  Syntax error

c)   Logical error

d)  Exception error

Answer: b)

5. Which of the following can raise exceptions in Python?

a)   Division by zero

b)  Accessing invalid index

c)   Using undefined variables

d)  All of the above

Answer: d)

 

Built-in Exceptions

6. Which exception is raised when a denominator is zero?

a)   ValueError

b)  ZeroDivisionError

c)   TypeError

d)  NameError

Answer: b)

7. Which of the following exceptions is raised when a variable is not defined? a) SyntaxError

b)  NameError

c)   ValueError

d)  TypeError

Answer: b)

8. ImportError occurs when:

a)   Wrong number of arguments passed

b)  File cannot be opened

c)   Requested module is not found

d)  Division by zero occurs

Answer: c)

9. Which error is raised when indentation is incorrect in Python code?

a)   TypeError

b)  IndentationError

c)   NameError

d)  ValueError

Answer: b)

10. EOFError occurs when:

a)   A file cannot be opened

b)  input() reaches end of file without reading data

c)   Wrong function argument

d)  Keyboard interrupt

Answer: b) Answer: b) Answer: a)

 

Raising Exceptions

11. Which statement is used to raise exceptions in Python?

a) throw

14.  Which of the following is NOT true about _raise?

a)   It can raise built-in exceptions

b)  It can raise user-defined exceptions

c)   It resumes execution of the current block

d)  It interrupts the normal flow of the program Answer: c)

15.  If an exception is raised using _raise, what happens to the following statements in the block?

a)   They are skipped

b)  They continue execution

c)   They are executed only if no exception occurs

d)  They are executed with a warning

Answer: a)

 

Handling Exceptions

16. Which keyword is used to start a block of code that may cause an exception? a) raise

b)  assert

c)   try

d)  except

Answer: c)

17. Exception handling in Python is done using:

a)   try...except

b)  try...except...else

c)   try...except...finally

d)  All of the above

Answer: d)

18. What happens if no exception occurs inside try block?

a)   except block is executed

b)  else block is executed (if present)

c)   finally block is skipped

d)  Program terminates abnormally

Answer: b)

19. Which block is always executed irrespective of exception occurrence? a) try

b)  except

c)   else

d)  finally

Answer: d)

20. If no matching exception is found in except blocks, what happens?

a)   Program continues normally

b)  Exception is ignored

c)   Program terminates

d)  Control goes to the else block

Answer: c)

 

 

Multiple Excepts and Flow

21. Which is correct syntax to handle multiple exceptions?

a)   Multiple try blocks

b)  Multiple except blocks for one try block

c)   Nested finally blocks

d)  Multiple else blocks

Answer: b)

22. What will happen if you use an except block without mentioning exception type? a) Error

a) Variables and their values

Answer: b)

25. Which of the following blocks can appear only once in exception handling? a) try

b)  except

c)   else

d)  finally

Answer: a), c), d) (all must appear at most once)

 

Applied Questions

26. What will happen if denominator entered is zero in the following code?

try:

   print(10/0) except ZeroDivisionError:    print("Error handled") a) Program terminates

b)  "Error handled" is displayed

c)   No output

d)  Runtime error occurs

Answer: b)

 

27. Which exception is raised in this code?

numbers = [1,2,3] print(numbers[10]) a) ValueError

Answer: b)

a)   Program ignores exception

b)  finally block executes, then exception re-raised

c)   Program terminates without error

d)  else block executes

Answer: b)

30. Which of the following is NOT a built-in exception?

a)   MemoryError

b)  NameError

c)   CompileError

d)  EOFError

Answer: c)

 

 

2 Marks Questions (10)

1.    Q: Differentiate between syntax errors and exceptions in Python.
A: Syntax errors occur when the code violates Python’s syntax rules; exceptions occur during program execution even if syntax is correct.

2.    Q: Explain the purpose of the raise statement in Python.
A: The raise statement is used to manually throw an exception, interrupting the normal program flow and transferring control to the exception handler.

3.    Q: What is the difference between assert and raise in Python?
A: assert tests a condition and raises an AssertionError if false; raise explicitly throws any specified exception.

4.    Q: Name and explain any four built-in exceptions in Python.
A:

• ZeroDivisionError: Raised when dividing by zero.
• ValueError: Raised when an operation receives an inappropriate value.
• NameError: Raised when a variable is not defined.
• IOError: Raised when a file cannot be opened.

5.    Q: What is the purpose of a finally block?
A: The finally block contains code that is always executed, regardless of whether an exception occurred or not, commonly used for resource cleanup.

6.    Q: Explain the difference between try…except and try…except…else.
A: In try…except, except runs only if an exception occurs. In try…except…else, the else block runs only if no exception occurs.

7.    Q: What is meant by catching an exception?
A: Catching an exception means executing code in an except block designed to handle a particular exception raised in the try block.

8.    Q: Give an example where IndexError can occur.
A: Accessing mylist[5] when mylist has only 3 elements will raise IndexError.

9.    Q: When is a ValueError raised in Python?
A: When a function receives an argument of correct type but inappropriate value, e.g., int("abc").

10.                       Q: Explain the process of exception handling in Python.
A: The interpreter creates an exception object, searches for a suitable handler in the call stack, and executes the handler code if found. If not found, the program stops.

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3 Marks Questions (10)

1.    Q: Write a Python program to accept two numbers and display their quotient. Raise a ZeroDivisionError if the denominator is zero.
A:

num1 = int(input("Enter numerator: "))

num2 = int(input("Enter denominator: "))

if num2 == 0:

    raise ZeroDivisionError("Denominator cannot be zero")

print("Quotient:", num1 / num2)

2.    Q: Write a program using assert to check that a number is positive before calculating its square.
A:

def square(number):

    assert number >= 0, "OOPS... Negative Number"

    return number * number

 

print(square(10))

3.    Q: Explain the purpose of multiple except blocks in Python with an example.
A: Multiple except blocks allow handling different exceptions separately.
Example:

try:

    x = int(input("Enter a number: "))

    y = int(input("Enter another number: "))

    print(x / y)

except ZeroDivisionError:

    print("Cannot divide by zero")

except ValueError:

    print("Invalid input")

4.    Q: What is the role of the call stack in exception handling?
A: The call stack maintains the sequence of function calls and helps the runtime system search for an appropriate exception handler.

5.    Q: Write a program using try-except-else to divide two numbers.
A:

try:

    x = int(input("Enter numerator: "))

    y = int(input("Enter denominator: "))

    result = x / y

except ZeroDivisionError:

    print("Cannot divide by zero")

except ValueError:

    print("Enter valid numbers")

else:

    print("Quotient is", result)

6.    Q: Explain the difference between user-defined and built-in exceptions.
A: Built-in exceptions are predefined by Python (e.g., ZeroDivisionError); user-defined exceptions are custom exceptions created by programmers for specific needs.

7.    Q: Give an example where IOError occurs.
A: Trying to open a non-existent file:

f = open("nofile.txt", "r")  # Raises IOError

8.    Q: What happens if an exception occurs but no handler is defined?
A: The program stops and Python displays a traceback with the exception details.

9.    Q: Explain how finally helps in recovering from exceptions.
A: Finally block executes regardless of exception occurrence, ensuring cleanup actions like closing files before the exception propagates further.

10.                       Q: Write a Python program to catch any exception without specifying its name.
A:

try:

    x = int(input("Enter number: "))

    print(10 / x)

except:

    print("Some exception occurred")

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5 Marks Questions (5)

1.    Q: Write a Python program to handle multiple exceptions (ZeroDivisionError, ValueError, and any other) using try-except-else-finally.
A:

try:

    num1 = int(input("Enter numerator: "))

    num2 = int(input("Enter denominator: "))

    result = num1 / num2

except ZeroDivisionError:

    print("Cannot divide by zero")

except ValueError:

    print("Enter valid numbers")

except:

    print("Some unexpected exception occurred")

else:

    print("Quotient is", result)

finally:

    print("Program execution completed")

2.    Q: Explain raising, catching, and handling exceptions with an example for each.
A:

• Raising: raise ValueError("Invalid input") interrupts program flow.
• Catching: Using except block to execute code when exception occurs.
• Handling: Code in except block fixes or informs user.
  Example:

try:

    x = int(input("Enter number >0: "))

    if x <= 0:

        raise ValueError("Number must be positive")

except ValueError as e:

    print(e)

3.    Q: Create a program using assert to check positive numbers and handle AssertionError using try-except.
A:

try:

    num = int(input("Enter number: "))

    assert num > 0, "Number must be positive"

except AssertionError as e:

    print(e)

else:

    print("Square is", num*num)

4.    Q: Explain the flow of try…except…else…finally with a diagrammatic description.
A: Flow:

• Try block executes co
  de where exception may occur.
• If exception occurs → except block executes.
• If no exception → else block executes.
• Finally block executes always.
  (Diagram can be drawn as: try → except (if error) / else (if no error) → finally (always))

5.    Q: Write a Python program that opens a file, reads content, and ensures the file is closed using finally. Handle any IOError.
A:

try:

    f = open("example.txt", "r")

    data = f.read()

    print(data)

except IOError:

    print("File not found or cannot be opened")

finally:

    f.close()

    print("File closed successfully")

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