CBSE Class 12
Computer Science
01 Exception Handling in Python
30
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Q-1
What is the purpose of exception handling in Python?
Easy
Introduction
Answer: To handle runtime errors gracefully
Explanation: Exception handling allows a program to deal with runtime errors without crashing.
Q-2
Which keyword is used to handle exceptions in Python?
Easy
Handling Exceptions
Answer: except
Explanation: The except block is used to catch and handle exceptions.
Q-3
Which of the following errors occurs during program execution?
Easy
Exceptions
Answer: Exception
Explanation: Exceptions occur during runtime when the program encounters an unexpected condition.
Q-4
Which of the following is a syntax error?
Easy
Syntax Errors
Reference Code
print("Hello"Answer: Missing closing parenthesis
Explanation: A missing closing parenthesis causes a syntax error before execution.
Q-5
What will happen if an exception occurs and it is not handled?
Easy
Exceptions
Answer: Program terminates with error
Explanation: If an exception is not handled, Python stops the program and displays an error message.
Q-6
Which block is used to test code that may raise an exception?
Easy
Handling Exceptions
Answer: try
Explanation: The try block contains code that may cause an exception.
Q-7
Which built-in exception occurs when dividing by zero?
Easy
Built-in Exceptions
Answer: ZeroDivisionError
Explanation: ZeroDivisionError occurs when division or modulo by zero happens.
Q-8
What will be the output of the following code?
Easy
Handling Exceptions
Reference Code
try:
print(10/0)
except ZeroDivisionError:
print("Error handled")Answer: Error handled
Explanation: Division by zero raises ZeroDivisionError which is handled by the except block.
Q-9
Which exception occurs when a variable is not defined?
Medium
Built-in Exceptions
Answer: NameError
Explanation: NameError occurs when a variable name is not defined.
Q-10
Which keyword is used to raise an exception manually?
Medium
Raising Exceptions
Answer: throw
Explanation: The raise keyword is used to trigger an exception intentionally.
Q-11
What exception occurs when accessing a list element with an invalid index?
Easy
Built-in Exceptions
Answer: IndexError
Explanation: IndexError occurs when the list index is out of range.
Q-12
Which block always executes whether an exception occurs or not?
Easy
Finally Clause
Answer: finally
Explanation: The finally block always executes after try and except.
Q-13
What will be printed?
Medium
Handling Exceptions
Reference Code
try:
x = int("abc")
except ValueError:
print("Invalid number")Answer: Invalid number
Explanation: Converting 'abc' to int raises ValueError which is handled.
Q-14
Which exception occurs when a wrong data type is used in an operation?
Easy
Built-in Exceptions
Answer: TypeError
Explanation: TypeError occurs when an operation is applied to an incompatible type.
Q-15
Which statement is used to define custom error conditions?
Medium
Raising Exceptions
Answer: raise
Explanation: raise allows programmers to trigger custom exceptions.
Q-16
What will be the output?
Medium
Finally Clause
Reference Code
try:
print("Hello")
finally:
print("Done")Answer: Hello
Done
Explanation: Both statements execute because finally runs after try.
Q-17
Which block executes when no exception occurs?
Medium
Handling Exceptions
Answer: else
Explanation: The else block runs if no exception occurs in the try block.
Q-18
Which error occurs when a dictionary key is not found?
Medium
Built-in Exceptions
Answer: KeyError
Explanation: KeyError occurs when accessing a dictionary key that does not exist.
Q-19
Which statement is correct about exceptions?
Easy
Exceptions
Answer: They occur during runtime
Explanation: Exceptions occur during program execution.
Q-20
Which keyword is used with try to catch errors?
Easy
Handling Exceptions
Answer: except
Explanation: except is used with try to catch exceptions.
Q-21
Which error occurs when converting an invalid string to integer?
Medium
Built-in Exceptions
Answer: ValueError
Explanation: ValueError occurs when a function receives a valid type but inappropriate value.
Q-22
Which block can follow multiple except blocks?
Medium
Finally Clause
Answer: finally
Explanation: finally executes after try and except blocks.
Q-23
What will be the output?
Medium
Handling Exceptions
Reference Code
try:
print(5 + '5')
except TypeError:
print("Type Error")Answer: Type Error
Explanation: Adding integer and string raises TypeError.
Q-24
Which statement stops exception propagation by handling it?
Medium
Handling Exceptions
Answer: except
Explanation: The except block catches and handles exceptions.
Q-25
Which block contains code that may cause an error?
Easy
Handling Exceptions
Answer: try
Explanation: The try block contains risky code.
Q-26
Which keyword allows you to trigger exceptions deliberately?
Easy
Raising Exceptions
Answer: raise
Explanation: raise allows programmers to generate exceptions.
Q-27
Which exception occurs when accessing a file that does not exist?
Medium
Built-in Exceptions
Answer: FileNotFoundError
Explanation: FileNotFoundError occurs when a file cannot be located.
Q-28
What will be printed?
Hard
Finally Clause
Reference Code
try:
print("Start")
x = 10/0
except:
print("Error")
finally:
print("End")Answer: Start
Error
End
Explanation: All three lines execute: Start, Error, and End.
Q-29
Which clause executes when no exception occurs in try block?
Medium
Handling Exceptions
Answer: else
Explanation: else executes only when no exception occurs.
Q-30
Which of the following is a built-in Python exception?
Easy
Built-in Exceptions
Answer: IndexError
Explanation: IndexError is a standard built-in Python exception.