Chapter Exam

Chapter-2 File Handling in Python — Online MCQ Test

Q: Which of the following is the correct extension for a text file in Python?

Answer: A. .txt — Text files in Python use the .txt extension to store plain text data.

Q: What does the 'r' mode do when opening a file in Python?

Answer: B. Read mode — The 'r' mode opens a file for reading existing content without modifying it.

Q: When you open a file in 'w' mode, what happens if the file already exists?

Answer: B. It overwrites the existing file — Write mode ('w') truncates and overwrites any existing file with the same name.

Q: Analyze this code: What will be the output?\nwith open('test.txt', 'w') as f:\n f.write('Hello')\nwith open('test.txt', 'r') as f:\n print(f.read())

Answer: A. Hello — The code writes 'Hello' to the file, then reads and prints it. The with statement ensures proper file handling.

COMPUTER SCIENCE · Grade 12 · CBSE(NCERT)

Practice Chapter-2 File Handling in Python with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 12 COMPUTER SCIENCE. This chapter covers: text files (.txt) - binary files (.dat) - pickle module - CSV files (.csv) - file reading - file writing. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-2 File Handling in Python — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 12 COMPUTER SCIENCE — Chapter-2 File Handling in Python, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the correct extension for a text file in Python?

A. .txt ✓
B. .dat
C. .csv
D. .py

Answer: A. .txt
Text files in Python use the .txt extension to store plain text data.

What does the 'r' mode do when opening a file in Python?

A. Write mode
B. Read mode ✓
C. Append mode
D. Binary mode

Answer: B. Read mode
The 'r' mode opens a file for reading existing content without modifying it.

When you open a file in 'w' mode, what happens if the file already exists?

A. It appends to the existing file
B. It overwrites the existing file ✓
C. It creates a new version of the file
D. It raises an error

Answer: B. It overwrites the existing file
Write mode ('w') truncates and overwrites any existing file with the same name.

Analyze this code: What will be the output?\nwith open('test.txt', 'w') as f:\n f.write('Hello')\nwith open('test.txt', 'r') as f:\n print(f.read())

A. Hello ✓
B. test.txt
C. None
D. An error occurs

Answer: A. Hello
The code writes 'Hello' to the file, then reads and prints it. The with statement ensures proper file handling.

TRICKY: What will happen if you try to pickle an open file object?

A. It will successfully pickle the file path
B. It will raise a TypeError because file objects cannot be pickled ✓
C. It will pickle the file contents
D. It will create a copy of the file

Answer: B. It will raise a TypeError because file objects cannot be pickled
File objects, along with lambda functions and some built-ins, cannot be pickled as they depend on runtime state.