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Session 6 Part 1 Quiz (Mutex Basics)

Question 1

What is a mutex mainly used for?

  • Running code faster automatically
  • Allowing only one worker into a critical section
  • Downloading files from the internet
  • Creating random numbers

Answer: 2 Type: single Time: 40 Explanation: A mutex protects shared resources by allowing one worker at a time into the protected code.

Question 2

In Python, which object is commonly used as a mutex in this session?

  • random.choice
  • requests.get
  • time.perf_counter
  • threading.Lock

Answer: 4 Type: single Time: 40 Explanation: threading.Lock is used to protect critical sections.

Question 3

What is a critical section?

  • A comment at the top of a file
  • A list of URLs
  • Code that must be protected because it uses shared state
  • A package installation command

Answer: 3 Type: single Time: 45 Explanation: Critical sections are parts of code where shared resources are accessed and need coordination.

Question 4

Why should multiple threads writing to one file be coordinated?

  • Threads cannot open files
  • Output can become mixed, lost, or difficult to trust
  • Python files can only contain one line
  • File writing is always CPU-bound

Answer: 2 Type: single Time: 45 Explanation: Uncoordinated writes can cause confusing or incorrect output.

Question 5

What does with lock: do?

  • Enters a protected block and releases the lock when done
  • Deletes the lock
  • Converts a thread into a process
  • Starts all waiting threads at once

Answer: 1 Type: single Time: 45 Explanation: The context manager acquires the lock, runs the block, and releases the lock.

Question 6

Why is the shared counter example protected by a lock?

  • The counter is a network request
  • Locks make integers larger
  • ThreadPoolExecutor cannot run without a lock
  • Reading and updating the counter should happen as one safe operation

Answer: 4 Type: single Time: 50 Explanation: The read-update-write sequence should not be interrupted by another worker.

Question 7

What does Faker help with in Exercise 1?

  • Starting threads automatically
  • Locking files
  • Generating fake sentences for practice
  • Measuring runtime

Answer: 3 Type: single Time: 40 Explanation: Faker generates fake text so the exercise can focus on safe file writing.

Question 8

Which line generates a short fake sentence?

  • fake.sentence(nb_words=6)
  • fake.lock(nb_words=6)
  • threading.sentence(6)
  • write_lock.sentence()

Answer: 1 Type: single Time: 40 Explanation: fake.sentence(nb_words=6) asks Faker for a short fake sentence.

Question 9

In the phrase exercise, what should be inside the lock-protected block?

  • The whole program from top to bottom
  • The import statements
  • The pip install command
  • Only the shared file-writing section

Answer: 4 Type: single Time: 45 Explanation: Keep the critical section small and protect the shared file write.

Question 10

What is a race condition?

  • A faster version of a loop
  • A bug caused by unpredictable timing between workers
  • A type of fake sentence
  • A completed quiz

Answer: 2 Type: single Time: 45 Explanation: Race conditions happen when worker timing affects shared-state behavior.