PUC II STATE BOARD / CBSE XII COMPUTER SCIENCE - Chapter 2 File Handling in Python, collection of questions
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PUC II STATE BOARD / CBSE XII COMPUTER SCIENCE - Chapter 2 File Handling in Python, collection of questions
Basics of File Handling
1.
What is a file in
Python?
A) A temporary storage in RAM
B) A named location on secondary storage to store data permanently ✅
C) A program variable
D) None of these
2.
Which of the
following is a text file?
A) .txt ✅
B) .exe
C) .mp4
D) .bin
3.
Which of the
following is a binary file?
A) .txt
B) .py
C) .dat ✅
D) .csv
4.
Text files store
data as:
A) Images
B) Audio
C) Characters in ASCII or Unicode ✅
D) Executable code
5.
Which of the
following is true about binary files?
A) Human readable
B) Cannot be read by any program
C) Requires specific software to read/write ✅
D) None of the above
Opening and Closing Files
6.
Which Python
function is used to open a file?
A) fopen()
B) file()
C) open() ✅
D) create()
7.
What is the
default mode in the open() function?
A) Write
B) Read ✅
C) Append
D) Binary
8.
What does file_object.closed return?
A) File content
B) Name of file
C) True if file is closed, else False ✅
D) None of these
9.
Which mode is
used to open a file for reading only?
A) 'w'
B) 'r' ✅
C) 'a'
D) 'rb'
10.
Which mode opens
a file for both reading and writing from the start?
A) 'r+' ✅
B) 'w'
C) 'a'
D) 'rb'
11.
What is the
advantage of using with open() over open()?
A) File is automatically closed ✅
B) File size is reduced
C) File can be opened faster
D) File becomes text only
12.
What happens if a
file is not closed explicitly?
A) Data is lost if not flushed ✅
B) File is deleted
C) File converts to binary
D) Nothing happens
Writing to a File
13.
Which method
writes a single string to a file?
A) writelines()
B) write() ✅
C) dump()
D) append()
14.
writelines() method takes what as input?
A) Single string
B) Iterable object like list/tuple ✅
C) Binary data
D) None
15.
What happens if
we open an existing file in write mode?
A) File contents are preserved
B) File contents are erased ✅
C) File is copied
D) None
16.
To write numeric
data to a file, it must first be converted to:
A) float
B) list
C) string ✅
D) int
17.
write() method returns:
A) Number of lines written
B) Number of characters written ✅
C) None
D) File size
Reading from a File
18.
Which method
reads the entire file as a string?
A) readlines()
B) readline()
C) read() ✅
D) writelines()
19.
read(n) reads:
A) n lines
B) n characters ✅
C) entire file
D) n bytes only in binary
20.
readline() reads:
A) One line at a time ✅
B) Entire file
C) Entire list
D) n lines
21.
readlines() returns:
A) String
B) List of lines ✅
C) Dictionary
D) Single line
22.
Which method
splits each line into words?
A) splitlines()
B) split() ✅
C) write()
D) dump()
23.
splitlines() differs from split() because it:
A) Splits file into bytes
B) Returns list of lines instead of words ✅
C) Writes to file
D) Reads binary files
File Positioning
24.
Which method
returns current file position?
A) seek()
B) tell() ✅
C) read()
D) close()
25.
seek(offset,
0) positions file at:
A) End
B) Current position
C) Offset bytes from start ✅
D) Offset bytes from end
26.
seek(offset,
2) moves file pointer:
A) From beginning
B) From current
C) From end ✅
D) None
27.
Why is file
offset useful?
A) To append data only
B) To access data randomly ✅
C) To close file
D) To compress file
Pickle Module
28.
What is pickling
in Python?
A) Converting Python object to bytes ✅
B) Converting string to int
C) Writing to text file
D) Closing file
29.
What is
unpickling?
A) Reading string
B) Converting bytes back to Python object ✅
C) Writing numbers
D) Opening text file
30.
Which mode is
used to write pickled object?
A) 'w'
B) 'wb' ✅
C) 'r'
D) 'rb'
31.
Which mode is
used to read pickled object?
A) 'r'
B) 'rb' ✅
C) 'w'
D) 'wb'
32.
Method used to
save Python object in a binary file:
A) write()
B) dump() ✅
C) read()
D) readlines()
33.
Method used to
load Python object from a binary file:
A) write()
B) load() ✅
C) read()
D) readline()
34.
Pickle module
deals with:
A) Text files
B) Binary files ✅
C) JSON files
D) CSV files
File Modes
35.
Mode to open text
file for appending:
A) 'w'
B) 'a' ✅
C) 'r'
D) 'rb'
36.
Mode to read and
append:
A) 'r+'
B) 'a+' ✅
C) 'w+'
D) 'rb+'
37.
Binary write and
read mode:
A) 'wb'
B) 'wb+' ✅
C) 'rb'
D) 'ab'
38.
Opening a
non-existing file in 'r' mode will:
A) Create the file
B) Raise error ✅
C) Append data
D) Open empty file
39.
w+ mode:
A) Reads only
B) Writes only
C) Reads and writes, overwriting existing content ✅
D) Appends only
Looping & Traversing
Files
40.
To read a file
line by line, use:
A) for loop ✅
B) while loop only
C) readlines() only
D) write()
41.
EOFError occurs in pickle when:
A) File not found
B) End of file is reached ✅
C) File is closed
D) File is empty
42.
with
open(file) as f: automatically:
A) Reads only
B) Writes only
C) Closes file after block ✅
D) Appends data
43.
File pointer in
append mode is:
A) Beginning ✅
B) End ✅
C) Middle
D) Random
Programs & Examples
44.
In file_object.write(str(marks)), what is marks?
A) String
B) Converted integer to string ✅
C) List
D) File object
45.
Which function
flushes buffer to file when closing?
A) write()
B) close() ✅
C) tell()
D) seek()
46.
What does file_object.writelines(lines) return?
A) Number of lines
B) None ✅
C) List of characters
D) File size
47.
In pickle,
multiple records are stored as:
A) Strings
B) Lists ✅
C) Integers
D) Bytes only
48.
To read all lines
as a list from a file:
A) read()
B) readline()
C) readlines() ✅
D) write()
49.
Which module is
needed to serialize Python objects?
A) io
B) pickle ✅
C) os
D) sys
50.
seek(10) positions file pointer at:
A) Beginning
B) 10 bytes from start ✅
C) 10 lines from start
D) End
50
MCQ Questions with Answers (1 mark each)
1.
A file in Python is a named
location on secondary storage where data are stored permanently. ✅
2.
Text files store human-readable
characters. ✅
3.
Binary files store data as bytes
not readable by humans. ✅
4.
Which Python function is used to
open a file? open() ✅
5.
Default mode for open() function is read mode ('r'). ✅
6.
Which method closes a file in
Python? close() ✅
7.
Which mode opens a file for writing
and overwrites existing content? 'w' ✅
8.
Which mode appends data to the end
of a file? 'a' ✅
9.
The write() method writes a single string to a file. ✅
10.
writelines() method writes multiple strings. ✅
11.
Which method reads the entire
file content? read() ✅
12.
Which method reads one line
at a time? readline() ✅
13.
Which method reads all lines into
a list? readlines() ✅
14.
What does tell() return? current file object position in bytes ✅
15.
What does seek() do? moves file object to a specific byte position ✅
16.
Using with
open() automatically closes the file
✅
17.
Text files usually end each line
with newline character (\n) ✅
18.
ASCII value 65 corresponds to the
character ‘A’ ✅
19.
Binary files require specific
software to access. ✅
20.
Pickle module is used for serializing
Python objects. ✅
21.
Serialization in Python is also
called pickling. ✅
22.
Deserialization in Python is called unpickling.
✅
23.
Pickle’s dump() writes data to a binary file ✅
24.
Pickle’s load() reads data from a binary file ✅
25.
If a file object is reassigned, the
previous file is automatically closed ✅
26.
read(n) reads n bytes from a file. ✅
27.
readline(n) reads up to n bytes or a full line ✅
28.
readlines() returns a list of lines ✅
29.
Text file extensions include .txt,
.py, .csv ✅
30.
Binary files may include images,
audio, video ✅
31.
Using write() method, numbers must be converted to string ✅
32.
File opened in 'rb' mode can read binary data ✅
33.
File opened in 'wb' mode can write binary data ✅
34.
File opened in 'r+' mode can read and write ✅
35.
File opened in 'a+' mode can append and read ✅
36.
split() returns words in a line as list ✅
37.
splitlines() returns lines as list elements ✅
38.
Using seek(0) moves the file object to the beginning ✅
39.
Using seek(offset,
2) moves file object from end of
file ✅
40.
File offset is counted in bytes
✅
41.
If a file opened in 'w' mode already exists, its content is overwritten ✅
42.
file.closed returns True if file is closed ✅
43.
Python's io module contains file handling functions ✅
44.
file.name returns the name of the file ✅
45.
Pickling stores Python objects as byte
streams ✅
46.
Binary files are sensitive to
even a single-bit change ✅
47.
End-of-file (EOF) is reached when read
returns empty string ✅
48.
file.mode returns mode in which file was opened ✅
49.
w+
mode allows writing and reading ✅
50.
rb+
mode allows reading and writing in binary ✅
1-Mark
Questions (10 questions with answers)
1.
What is a file in Python?
Answer: A named location on secondary storage where data are stored
permanently.
2.
Name two types of files.
Answer: Text file and Binary file.
3.
Which method is used to close a
file?
Answer: close()
4.
What character usually marks the end
of a line in a text file?
Answer: Newline character \n
5.
Which method reads one complete line
from a file?
Answer: readline()
6.
Which method reads all lines as a
list?
Answer: readlines()
7.
Which function opens a file in
Python?
Answer: open()
8.
What mode is used to append data to
an existing file?
Answer: 'a'
9.
Pickle module is used to ________
Python objects.
Answer: Serialize (pickling) and deserialize (unpickling)
10.
What does tell() return?
Answer: Current position of the file object in bytes
2-Mark
Questions (10 questions with answers)
1.
Differentiate text file and binary
file.
Answer: Text files contain human-readable characters and can be opened
with text editors. Binary files contain bytes representing images, audio, or
executable content, not human-readable.
2.
Write syntax of open() function.
Answer: file_object = open(file_name,
access_mode)
3.
Difference between read() and readline().
Answer: read()
reads a specified number of bytes or entire file, readline() reads a single line from the file.
4.
Difference between write() and writelines().
Answer: write() writes a single string; writelines() writes multiple strings from a list or iterable.
5.
What is the purpose of seek()?
Answer: Moves the file object to a specific byte position in a file.
6.
What is serialization and
deserialization in Python?
Answer: Serialization (pickling) converts a Python object to a byte
stream; deserialization (unpickling) converts byte stream back to Python object.
7.
How do you automatically close a
file after opening it?
Answer: Using with open(file_name, mode) as
file_object:
8.
Name one difference between 'w+' and 'a+'
mode.
Answer: 'w+'
overwrites existing content; 'a+' appends at the end.
9.
What is returned by file.closed and file.mode?
Answer: file.closed returns True if file is closed; file.mode returns the access mode.
10.
Which Python module is used to
handle files?
Answer: io
module
3-Mark
Questions (10 questions with answers)
1.
Explain the difference between split() and splitlines().
Answer: split() splits a line into words and returns a list; splitlines() splits the file into lines and returns a list of lines.
2.
Write the Python statement to open a
text file example.txt in read and write mode.
Answer: file_object =
open("example.txt", "r+")
3.
How do you write multiple lines to a
file using Python?
Answer: Use writelines(list_of_strings) after opening file in write or append mode.
4.
Explain the difference between
opening a file using open()
and with open().
Answer: with open() automatically closes the file after the block is executed,
even if an exception occurs; open() requires manual close().
5.
How can you read a file line by line
in Python?
Answer: Using a loop with readline(), for example:
file
= open("file.txt", "r")
line
= file.readline()
while
line:
print(line)
line = file.readline()
file.close()
6.
What happens if you try to read a
binary file in text mode?
Answer: You may get garbage values or unreadable content, as binary
files are not human-readable.
7.
Explain 'rb+' mode in Python file handling.
Answer: 'rb+'
opens the file for reading and writing in binary mode from the beginning of the
file.
8.
How is the current position of file
object obtained in Python?
Answer: Using tell()
method.
9.
Write Python code to write a string Hello
World to a file sample.txt.
Answer:
file
= open("sample.txt", "w")
file.write("Hello
World\n")
file.close()
10.
What is the difference between 'r+' and 'w+'
modes?
Answer: 'r+'
reads and writes without deleting content; 'w+' overwrites the existing content.
5-Mark
Questions (10 questions with elaborated answers)
1.
Explain
pickling and unpickling in Python with an example.
Answer:
Pickling is the process of converting a Python object into a byte stream for
storage in a binary file. Unpickling is converting the byte stream back to
Python object.
Example:
import
pickle
data
= [1, "Alice", 25]
#
Pickling
with
open("data.dat", "wb") as file:
pickle.dump(data, file)
#
Unpickling
with
open("data.dat", "rb") as file:
obj = pickle.load(file)
print(obj) # Output: [1, 'Alice', 25]
2.
Write a
program to accept strings from the user till 'END' is entered, save in a file
and display sentences starting with uppercase.
Answer:
f
= open("data.txt", "w")
while
True:
s = input("Enter string: ")
if s == "END":
break
f.write(s + "\n")
f.close()
f
= open("data.txt", "r")
for
line in f:
if line[0].isupper():
print(line.strip())
f.close()
3.
Explain the
difference between text file and binary file.
Answer:
- Text file:
Human-readable, stores characters as bytes using ASCII/Unicode. Examples: .txt, .csv.
Can be opened with text editors.
- Binary file:
Stores bytes as-is for images, audio, video, or pickled objects. Not
human-readable. Requires specific software to access.
4.
Write Python
statements to open files in given modes:
Answer:
a) example.txt in
read/write mode: open("example.txt",
"r+")
b) bfile.dat in write
mode: open("bfile.dat",
"wb")
c) try.txt in
append/read mode: open("try.txt",
"a+")
d) btry.dat in
read-only mode: open("btry.dat",
"rb")
5.
Explain the use of seek() and tell() with example.
Answer:
- tell()
returns current byte position of the file object.
- seek(offset, reference)
moves file pointer to a specified byte offset.
Example:
f
= open("data.txt", "r")
print(f.tell()) # Current position
f.seek(5) # Move to 5th byte
print(f.read(10))
f.close()
6.
Explain
differences between read(), readline(), and readlines().
Answer:
- read(n): Reads
n bytes or entire file if n is negative.
- readline(n):
Reads one line, optionally up to n bytes.
- readlines():
Reads all lines and returns a list of strings, each ending with \n.
7.
Explain file
modes 'r', 'w', 'a', 'r+', 'w+', 'a+' with examples.
Answer:
- 'r':
Read-only.
- 'w':
Write-only, overwrites existing content.
- 'a':
Append at end.
- 'r+': Read
and write.
- 'w+': Write
and read, overwrites existing content.
- 'a+':
Append and read.
Example:
f
= open("file.txt", "a+")
f.write("New
line\n")
f.seek(0)
print(f.read())
f.close()
8.
Write a
program to store employee records in binary using Pickle and read them.
Answer:
import
pickle
bfile
= open("emp.dat", "ab")
rec
= [101, "Alice", 30000]
pickle.dump(rec,
bfile)
bfile.close()
with
open("emp.dat", "rb") as bfile:
emp = pickle.load(bfile)
print(emp)
9.
Explain
difference between write() and writelines() with example.
Answer:
- write():
Writes single string. Returns number of characters written.
- writelines():
Writes multiple strings from iterable, does not return number of
characters.
Example:
f
= open("file.txt", "w")
f.write("Hello\n")
lines
= ["Line1\n", "Line2\n"]
f.writelines(lines)
f.close()
10.
Explain how to perform reading and writing in a single file
object.
Answer:
Open file in 'w+'
or 'a+' mode. Write data using write(), then use seek(0) to move pointer to start for reading.
Example:
f
= open("report.txt", "w+")
f.write("Hello\n")
f.seek(0)
print(f.read())
f.close()
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