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Python PCEP Practice Questions: KeyboardInterrupt Exception

PCEP Certification Practice Test - Questions, Answers and Explanations

Here are 25 PCEP questions focusing on the “KeyboardInterrupt” exception from Python's built-in exception hierarchy. The questions use various formats, including single- and multiple-select questions, fill-in-the-gap, code fill, code insertion, sorting, and more.

Question 1: Which of the following best describes the KeyboardInterrupt exception in Python?

  1. Raised when the user interrupts the program with a keyboard signal (e.g., Ctrl+C).
  2. Raised when the program cannot find a file.
  3. Raised when an arithmetic operation exceeds the limits.
  4. Raised when a syntax error is found in the code.
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Answer: A) Raised when the user interrupts the program with a keyboard signal (e.g., Ctrl+C).

Explanation: The KeyboardInterrupt exception is raised when the user manually interrupts a running program, typically by pressing Ctrl+C.

Question 2: Which of the following are true about the KeyboardInterrupt exception? (Select all that apply.)

  • It is a subclass of Exception.
  • It is raised when a user presses Ctrl+C during program execution.
  • It can be caught using a try-except block.
  • It cannot be caught or handled.
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Answer: B) It is raised when a user presses Ctrl+C during program execution.
C) It can be caught using a try-except block.

Explanation: The KeyboardInterrupt exception is a subclass of Exception and is raised when the user interrupts the program using keyboard input (like Ctrl+C). It can be handled by catching it in a try-except block.

Question 3: _________ is the keyboard combination that usually raises the KeyboardInterrupt exception in Python.

  1. Alt+F4
  2. Ctrl+C
  3. Shift+Esc
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Answer: B) Ctrl+C

Explanation: The combination Ctrl+C is commonly used in terminal or command-line environments to signal an interruption, which raises a KeyboardInterrupt in Python.

Question 4: In Python, pressing Ctrl+C raises the __________ exception, which can be caught to prevent program termination.

▼

Answer: KeyboardInterrupt

Explanation: The KeyboardInterrupt exception is raised when a user sends an interrupt signal to the program, typically by pressing Ctrl+C.

Question 5: Fill in the blanks to complete the code that catches a KeyboardInterrupt exception and prints a message:

try:
    while True:
        pass
except __________:
    print("Program interrupted by the user")
▼

Answer: except KeyboardInterrupt:

Explanation: The except KeyboardInterrupt: block catches the KeyboardInterrupt exception, allowing the program to handle user interruptions gracefully.

Question 6: What happens if a KeyboardInterrupt is not caught by an exception handler?

  1. The program continues execution.
  2. The program terminates immediately.
  3. The program pauses until user input is received.
  4. The program skips to the next line of code.
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Answer: B) The program terminates immediately

Explanation: If the KeyboardInterrupt exception is not caught, the program terminates immediately, stopping further execution.

Question 7: Insert the code to handle a KeyboardInterrupt exception in the following code snippet:

while True:
    print("Running...")
    # INSERT CODE HERE to allow interruption with Ctrl+C
▼

Answer: 

try:
    while True:
        print("Running...")
except KeyboardInterrupt:
    print("Program stopped by user.")

Explanation: By using a try-except block, the KeyboardInterrupt exception can be caught, allowing the program to print a message before termination instead of abruptly stopping.

Question 8: Which of the following operations could be interrupted by a KeyboardInterrupt exception? (Select all that apply.)

  1. An infinite loop (while True:)
  2. A file read operation
  3. A network request
  4. A function that raises a ZeroDivisionError
▼

Answer: A) An infinite loop (while True:)
B) A file read operation
C) A network request

Explanation: Most operations, including loops, file reading, and network requests, can be interrupted by a KeyboardInterrupt. The ZeroDivisionError is unrelated to user interruptions.

Question 9: To allow users to terminate a long-running script gracefully, the _________ exception should be caught and handled in Python.

  • ImportError
  • IOError
  • KeyboardInterrupt
▼

Answer: C) KeyboardInterrupt

Explanation: Catching KeyboardInterrupt allows the program to handle user-triggered interruptions, such as pressing Ctrl+C, which is useful for gracefully terminating long-running scripts.

Question 10: The __________ exception is a subclass of the BaseException class and is designed to catch user interruptions.

▼

Answer: KeyboardInterrupt

Explanation: KeyboardInterrupt is a subclass of BaseException, which allows it to be caught when the user sends an interrupt signal, typically by pressing Ctrl+C.

Question 11: Arrange the following steps in the correct order for how a KeyboardInterrupt is handled in Python when Ctrl+C is pressed:

  1. The interrupt signal is sent to the program.
  2. The program terminates (if the exception is not caught).
  3. The exception is caught by the program (if a handler is present).
  4. Python raises the KeyboardInterrupt exception.
▼

Answer: A) The interrupt signal is sent to the program.
D) Python raises the KeyboardInterrupt exception.
C) The exception is caught by the program (if a handler is present).
B) The program terminates (if the exception is not caught).

Explanation: When Ctrl+C is pressed, the system sends an interrupt signal to the program, Python raises the KeyboardInterrupt exception, and the program either handles it or terminates if it's not caught.

Question 12: Which of the following exceptions are similar in nature to KeyboardInterrupt, in that they inherit from BaseException? (Select all that apply.)

  1. SystemExit
  2. MemoryError
  3. KeyboardInterrupt
  4. NameError
▼

Answer: A) SystemExit
B) MemoryError
C) KeyboardInterrupt

Explanation: Both SystemExit, MemoryError, and KeyboardInterrupt inherit from BaseException. They are not typical exceptions but are used to handle specific situations like system exit, memory exhaustion, and user interruptions.

Question 13: In the try-except block, the _________ exception is used to catch interruptions from user input like pressing Ctrl+C.

  1. IOError
  2. ImportError
  3. KeyboardInterrupt
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Answer: C) KeyboardInterrupt

Explanation: KeyboardInterrupt is used to catch the interruption signal when the user presses Ctrl+C, allowing the program to handle it and potentially clean up before exiting.

Question 14: The Python interpreter raises KeyboardInterrupt when the user sends an interrupt signal, typically by pressing __________.

▼

Answer: Ctrl+C

Explanation: The most common method for sending an interrupt signal to a Python program is pressing Ctrl+C in the terminal, which raises the KeyboardInterrupt exception.

Question 15: Fill in the blanks in this code to catch KeyboardInterrupt and stop the program gracefully:

try:
    while True:
        print("Processing...")
except __________:
    print("Terminating...")
▼

Answer: except KeyboardInterrupt:

Explanation: The except KeyboardInterrupt block catches the KeyboardInterrupt exception when the user interrupts the program, allowing it to stop gracefully.

Question 16: What happens if a user sends an interrupt signal (e.g., Ctrl+C) while the program is executing without any exception handling?

  1. The program ignores the signal and continues running.
  2. The program pauses until user input is provided.
  3. The program raises a KeyboardInterrupt exception and terminates.
  4. The program raises a SystemExit exception.
▼

Answer: C) The program raises a KeyboardInterrupt exception and terminates.

Explanation: When an interrupt signal is sent by the user and there is no exception handling, Python raises a KeyboardInterrupt exception and terminates the program.

Question 17: Insert the correct code to handle a KeyboardInterrupt exception and terminate the loop gracefully:

while True:
    try:
        print("Running...")
        # INSERT CODE HERE to allow for interruption
▼

Answer: 

except KeyboardInterrupt:
    print("Loop interrupted by user.")
    break

Explanation: Catching the KeyboardInterrupt allows the program to terminate the loop gracefully when the user interrupts the program using Ctrl+C.

Question 18: In which of the following scenarios would a KeyboardInterrupt exception typically be raised?

  1. When trying to divide by zero.
  2. When pressing Ctrl+C while a program is running.
  3. When attempting to import a non-existent module.
  4. When referencing an undefined variable.
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Answer: B) When pressing Ctrl+C while a program is running.

Explanation: A KeyboardInterrupt is typically raised when the user presses Ctrl+C to manually interrupt a running program.

Question 19: When a user interrupts a Python program by pressing Ctrl+C, the program raises the ___________ exception, which can be caught for graceful termination.

▼

Answer: KeyboardInterrupt

Explanation: The KeyboardInterrupt exception is raised when the user manually interrupts a running program, usually by pressing Ctrl+C.

Question 20: Which of the following methods can be used to handle a KeyboardInterrupt exception? (Select all that apply.)

  1. Wrapping the code inside a try-except block.
  2. Ignoring the KeyboardInterrupt exception and letting the program crash.
  3. Catching the exception and executing custom code.
  4. Raising a ZeroDivisionError.
▼

Answer: A) Wrapping the code inside a try-except block.
C) Catching the exception and executing custom code.

Explanation: The KeyboardInterrupt exception can be caught using a try-except block, and custom code can be executed to handle the program termination gracefully.

Question 21: If a KeyboardInterrupt is not caught, Python will terminate the program by raising the __________ exception.

  1. ZeroDivisionError
  2. SystemExit
  3. KeyboardInterrupt
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Answer: C) KeyboardInterrupt

Explanation: If a KeyboardInterrupt exception is not caught in the program, Python will raise this exception and terminate the program.

Question 22: Fill in the blanks to complete the following code that terminates the program when the user sends an interrupt signal:

try:
    while True:
        print("Working...")
except __________:
    print("Process interrupted by user.")
    exit()
▼

Answer: except KeyboardInterrupt:

Explanation: The except KeyboardInterrupt block catches the user interrupt signal (Ctrl+C) and allows the program to terminate gracefully with a custom message.

Question 23: Which of the following exceptions is raised when the user sends an interrupt signal during a program’s execution?

  1. MemoryError
  2. NameError
  3. KeyboardInterrupt
  4. ImportError
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Answer: C) KeyboardInterrupt

Explanation: KeyboardInterrupt is the exception raised when the user sends an interrupt signal to the program, typically by pressing Ctrl+C.

Question 24: Arrange the following in the correct order when handling a KeyboardInterrupt exception:

  1. User sends an interrupt signal by pressing Ctrl+C.
  2. Python raises a KeyboardInterrupt.
  3. The program catches the exception (if a handler is present).
  4. Program starts executing.
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Answer: D) Program starts executing.
A) User sends an interrupt signal by pressing Ctrl+C.
B) Python raises a KeyboardInterrupt.
C) The program catches the exception (if a handler is present).

Explanation: First, the program runs, and when the user interrupts it, Python raises the KeyboardInterrupt exception. If the exception is caught by a handler, the program can manage the interruption.

Question 25: What happens when a KeyboardInterrupt exception is raised and caught? (Select all that apply.)

  1. The program continues executing.
  2. The program stops immediately.
  3. Custom logic in the except block is executed.
  4. The program terminates without executing any additional code.
▼

Answer: A) The program continues executing.
C) Custom logic in the except block is executed.

Explanation: When a KeyboardInterrupt exception is raised and caught, the custom logic inside the except block is executed, and the program can continue running or terminate based on that logic.



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