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.

file()

B.

start()

C.

read()

D.

open()

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

A.

Read ('r')

B.

Binary ('b')

C.

Write ('w')

D.

Append ('a')

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.

'w'

B.

'x'

C.

'r'

D.

'a'

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

A.

Cast it to a float

B.

Pickle it

C.

Write it directly

D.

Cast it to a string

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.

Integer

B.

Dictionary

C.

List of strings

D.

String

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

A.

try

B.

do

C.

for

D.

with

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

A.

sys

B.

dir

C.

file

D.

os

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.

Converting a byte stream back into an object

C.

Compressing a file

D.

Encrypting a file

11 $Which module is required to perform pickling?$

A.

os

B.

serialize

C.

pickle

D.

json

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

A.

'w'

B.

'wb'

C.

'r'

D.

'rb'

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

A.

pickle.write()

B.

pickle.load()

C.

pickle.push()

D.

pickle.dump()

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

A.

ZeroDivisionError

B.

ArithmeticError

C.

ValueError

D.

TypeError

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

A.

finally

B.

try

C.

except

D.

else

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

A.

Always

B.

When the try block fails

C.

When an exception occurs

D.

When no exception occurs

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

A.

NameError

B.

IOError

C.

FileError

D.

FileNotFoundError

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

A.

except MyError:

B.

handle MyError:

C.

catch MyError:

D.

try MyError:

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

A.

To return a value

B.

To handle errors

C.

To stop the program

D.

To execute code regardless of errors

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

A.

catch Exception e:

B.

except Exception as e:

C.

except e in Exception:

D.

except Exception with e:

21 $Which module supports Regular Expressions in Python?$

A.

regexp

B.

re

C.

pyre

D.

regex

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

A.

Any character

B.

End of string

C.

Start of string

D.

Escape character

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.

Only a literal dot

B.

Any digit

C.

Start of string

D.

Any character except a newline

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

A.

re.search()

B.

re.findall()

C.

re.find()

D.

re.match()

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

A.

Any non-digit

B.

Any whitespace

C.

Any alphabet

D.

Any digit (0-9)

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

A.

re.findall()

B.

re.group()

C.

re.match()

D.

re.search()

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

A.

Exactly 1 occurrence

B.

0 or 1 occurrence

C.

1 or more occurrences

D.

0 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 match object

B.

A string with replacements made

C.

A boolean

D.

A list

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

A.

\w+@\w+.\w+

B.

\d+@\w+

C.

\w#\w

D.

email:\w

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

A.

<div> tags

B.

span 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 1 or more times

D.

Match exactly 1 time

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

A.

\s

B.

\S

C.

\W

D.

\w

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

A.

They allow binary data

B.

They avoid conflict with Python's escape characters

C.

They match case insensitively

D.

They run faster

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

A.

return()

B.

match()

C.

group()

D.

get()

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

A.

re.M

B.

re.I

C.

re.A

D.

re.C

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 None

B.

Returns False

C.

Raises an error

D.

Returns -1

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

A.

To connect to the server

B.

To execute JavaScript

C.

To extract text matching specific patterns

D.

To render the page

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

A.

Generate Code Working Directory

B.

Get Count Working Directory

C.

Get Current Write Directory

D.

Get Current Working Directory

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

A.

os.check()

B.

os.exists()

C.

os.path.exists()

D.

file.exists()

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

A.

write()

B.

print()

C.

writelines()

D.

putlines()

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

A.

Start of string

B.

End of string

C.

Variable

D.

Currency

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

A.

w+

B.

z

C.

rb

D.

ab

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

A.

The program crashes (terminates)

B.

The try block repeats

C.

It is ignored

D.

The else block runs

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

A.

\w

B.

\n

C.

\D

D.

\d

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

A.

To join strings

B.

To find duplicates

C.

To remove patterns

D.

To split a string by the occurrences of a pattern

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

A.

The file path string

B.

A file object opened in binary write mode

C.

The directory name

D.

A string of data

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

A.

os

B.

sys

C.

urllib

D.

pickle

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

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