INT108 Unit 6: Files and Exceptions; Regular Expressions - MCQ Practice | B. Tech. CSE

1 $Which function is used to open a file in Python?$

A.

read()

B.

file()

C.

start()

D.

open()

2 $What is the default mode when opening a file using the open() function?$

A.

Append ('a')

B.

Binary ('b')

C.

Write ('w')

D.

Read ('r')

3 $Which file mode opens a file for writing and creates the file if it does not exist, but truncates it if it does?$

A.

'a'

B.

'w'

C.

'r'

D.

'x'

4 $To write a variable that is an integer to a text file, what must be done first?$

A.

Pickle it

B.

Cast it to a string

C.

Cast it to a float

D.

Write it directly

5 $Which method is used to read the entire content of a file as a single string?$

A.

readline()

B.

scan()

C.

readlines()

D.

read()

6 $What is the return type of the readlines() method?$

A.

String

B.

List of strings

C.

Dictionary

D.

Integer

7 $Which keyword is used to handle file closing automatically in Python?$

A.

for

B.

try

C.

with

D.

do

8 $Which module allows you to interact with the operating system to handle directories?$

A.

dir

B.

os

C.

file

D.

sys

9 $Which function is used to create a new directory?$

A.

os.make()

B.

os.newdir()

C.

os.create_dir()

D.

os.mkdir()

10 $What does 'Pickling' refer to in Python?$

A.

Converting an object hierarchy into a byte stream

B.

Compressing a file

C.

Converting a byte stream back into an object

D.

Encrypting a file

11 $Which module is required to perform pickling?$

A.

pickle

B.

json

C.

serialize

D.

os

12 $Which file mode must be used when writing pickled data to a file?$

A.

'rb'

B.

'r'

C.

'w'

D.

'wb'

13 $Which function is used to deserialize a byte stream back into a Python object?$

A.

pickle.write()

B.

pickle.push()

C.

pickle.dump()

D.

pickle.load()

14 $What exception is raised when a number is divided by zero?$

A.

ValueError

B.

ZeroDivisionError

C.

TypeError

D.

ArithmeticError

15 $Which block contains the code that might raise an exception?$

A.

else

B.

try

C.

finally

D.

except

16 $When is the code inside the 'else' block of a try-except statement executed?$

A.

When an exception occurs

B.

Always

C.

When the try block fails

D.

When no exception occurs

17 $What exception is raised when trying to open a file that does not exist in read mode?$

A.

FileError

B.

FileNotFoundError

C.

NameError

D.

IOError

18 $Which of the following correctly handles a specific exception named 'MyError'?$

A.

try MyError:

B.

handle MyError:

C.

catch MyError:

D.

except MyError:

19 $What is the primary purpose of the 'finally' block?$

A.

To execute code regardless of errors

B.

To stop the program

C.

To handle errors

D.

To return a value

20 $How can you access the error message associated with an exception?$

A.

except e in Exception:

B.

except Exception as e:

C.

catch Exception e:

D.

except Exception with e:

21 $Which module supports Regular Expressions in Python?$

A.

regexp

B.

pyre

C.

re

D.

regex

22 $What does the special character '^' represent in a regular expression?$

A.

Any character

B.

Escape character

C.

End of string

D.

Start of string

23 $Which regular expression quantifier matches 0 or more occurrences of the preceding character?$

A.

?

B.

*

C.

+

D.

.

24 $What does the pattern '.' (dot) match?$

A.

Start of string

B.

Any character except a newline

C.

Only a literal dot

D.

Any digit

25 $Which function searches for a pattern only at the beginning of a string?$

A.

re.match()

B.

re.find()

C.

re.findall()

D.

re.search()

26 $What does the special sequence '\d' match?$

A.

Any alphabet

B.

Any whitespace

C.

Any non-digit

D.

Any digit (0-9)

27 $Which function returns a list of all non-overlapping matches in the string?$

A.

re.match()

B.

re.group()

C.

re.findall()

D.

re.search()

28 $What does the quantifier '+' match?$

A.

0 or 1 occurrence

B.

Exactly 1 occurrence

C.

0 or more occurrences

D.

1 or more occurrences

29 $Which character is used to define a range of characters, like 'a' through 'z'?$

A.

[]

B.

()

C.

<>

D.

{}

30 $What is the output of re.sub()?$

A.

A string with replacements made

B.

A list

C.

A match object

D.

A boolean

31 $Which regex pattern would match a valid email address roughly containing an '@' symbol?$

A.

email:\w

B.

\w#\w

C.

\d+@\w+

D.

\w+@\w+.\w+

32 $In the context of web scraping with regex, what are usually targeted to extract links?$

A.

span tags

B.

<div> tags

C.

href attributes

D.

src attributes

33 $What does the '?' quantifier signify?$

A.

Match 0 or 1 times

B.

Match 0 or more times

C.

Match exactly 1 time

D.

Match 1 or more times

34 $Which special sequence matches any whitespace character (space, tab, newline)?$

A.

\W

B.

\w

C.

\s

D.

\S

35 $Why are raw strings (r'text') preferred for regular expressions in Python?$

A.

They allow binary data

B.

They match case insensitively

C.

They avoid conflict with Python's escape characters

D.

They run faster

36 $What method of a match object returns the string matched by the regex?$

A.

match()

B.

get()

C.

group()

D.

return()

37 $Which flag is used to perform case-insensitive matching?$

A.

re.M

B.

re.C

C.

re.I

D.

re.A

38 $How do you define a 'group' within a regular expression to extract specific parts?$

A.

Using ||

B.

Using {}

C.

Using []

D.

Using ()

39 $What happens if re.match() does not find a match?$

A.

Returns False

B.

Returns -1

C.

Raises an error

D.

Returns None

40 $In Web Scraping, why might regex be used on HTML content?$

A.

To extract text matching specific patterns

B.

To connect to the server

C.

To execute JavaScript

D.

To render the page

41 $What is the function os.getcwd() used for?$

A.

Get Count Working Directory

B.

Get Current Write Directory

C.

Get Current Working Directory

D.

Generate Code Working Directory

42 $Which method is used to check if a file exists at a specified path?$

A.

os.path.exists()

B.

os.exists()

C.

os.check()

D.

file.exists()

43 $To write a list of strings to a file, which method is most direct?$

A.

write()

B.

putlines()

C.

writelines()

D.

print()

44 $What does the '$' symbol represent in regex?$

A.

End of string

B.

Currency

C.

Variable

D.

Start of string

45 $Which of the following is NOT a valid file mode?$

A.

rb

B.

ab

C.

z

D.

w+

46 $If a try block raises an exception that is not defined in the except block, what happens?$

A.

The else block runs

B.

It is ignored

C.

The program crashes (terminates)

D.

The try block repeats

47 $Which regex pattern matches any non-digit character?$

A.

\D

B.

\n

C.

\w

D.

\d

48 $What is the purpose of the re.split() function?$

A.

To find duplicates

B.

To split a string by the occurrences of a pattern

C.

To join strings

D.

To remove patterns

49 $When using pickle.dump(obj, file), what is the 'file' argument?$

A.

A file object opened in binary write mode

B.

The directory name

C.

A string of data

D.

The file path string

50 $What is the standard Python library used to fetch URLs for web scraping before using regex?$

A.

pickle

B.

sys

C.

urllib

D.

os

Unit 6: Files and Exceptions; Regular Expressions - Practice Quiz

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