MCQs

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Overall MCQs for Reference

1. Which data type is commonly used for storing textual data in Python?
   a. Integer
   b. String
   c. Float
   d. Boolean
   Answer: b. Stringsaidatascience+1​
2. What is the output of “data” + “science” in Python?
   a. datas
   b. science
   c. datascience
   d. Error
   Answer: c. datasciencew3schools+1​
3. Strings in Python are:
   a. Mutable
   b. Immutable
   c. Variable
   d. Fixed
   Answer: b. Immutabletestbook+1​
4. Which method converts all characters in a string to uppercase?
   a. lower()
   b. upper()
   c. case()
   d. capitalize()
   Answer: b. upper()w3schools​
5. What is the result of “hello world”.split()?
   a. [“hello”, “world”]
   b. “hello world”
   c. [“hello world”]
   d. [“h”, “e”, “l”, “l”, “o”]
   Answer: a. [“hello”, “world”]jakevdp.github+1​
6. How are strings delimited in Python?
   a. With parentheses
   b. With curly braces
   c. With single or double quotes
   d. With angle brackets
   Answer: c. With single or double quotesw3schools​
7. In data analysis, which operation is frequently used to clean whitespace from string data?
   a. append()
   b. strip()
   c. merge()
   d. join()
   Answer: b. strip()tutedude+1​
8. Which of these is a valid way to format strings in Python?
   a. f-strings
   b. format()
   c. % operator
   d. All of the above
   Answer: d. All of the abovegeeksforgeeks+1​
9. What is returned by “Data Science”.find(“Science”)?
   a. -1
   b. 0
   c. 5
   d. True
   Answer: c. 5jakevdp.github+1​
10. What does the method join() do with strings?
    a. Splits a string into parts
    b. Combines items in a list into a string
    c. Inserts whitespace
    d. Removes characters
    Answer: b. Combines items in a list into a stringw3schools+1​
11. Which function counts the occurrences of a substring in Python?
    a. length()
    b. count()
    c. find()
    d. search()
    Answer: b. count()jakevdp.github+1​
12. What does “python”[::-1] return?
    a. “python”
    b. “nohtyp”
    c. Error
    d. “pyth”
    Answer: b. “nohtyp”w3schools​
13. Which method replaces occurrences of a substring in a string?
    a. change()
    b. switch()
    c. replace()
    d. modify()
    Answer: c. replace()jakevdp.github+1​
14. Which library provides vectorized string operations in Python data analysis?
    a. NumPy
    b. pandas
    c. SciPy
    d. scikit-learn
    Answer: b. pandasjakevdp.github​
15. What does str.strip() do in string analysis?
    a. Adds whitespace
    b. Removes leading and trailing whitespace
    c. Concatenates strings
    d. Formats text
    Answer: b. Removes leading and trailing whitespacetutedude+1​
16. Which regular expression function in Pandas returns a boolean for string matches?
    a. contain()
    b. match()
    c. select()
    d. check()
    Answer: b. match()jakevdp.github​
17. What is the result of “Data Science”.lower()?
    a. “DATA SCIENCE”
    b. “data science”
    c. “Data science”
    d. “data Science”
    Answer: b. “data science”w3schools​
18. In Python, what is the result of len(“Algorithm”)?
    a. 8
    b. 9
    c. 10
    d. Error
    Answer: b. 9w3schools​
19. Which method checks if a string contains a given substring?
    a. contains()
    b. find()
    c. in
    d. search()
    Answer: b. find()w3schools+1​
20. What does “Machine Learning”.startswith(“Machine”) return?
    a. True
    b. False
    c. Error
    d. None
    Answer: a. Truew3schools​
21. Which function is useful for extracting matched groups from strings with regular expressions in Pandas?
    a. extract()
    b. split()
    c. replace()
    d. select()
    Answer: a. extract()jakevdp.github​
22. How would you get the first three characters of a string s?
    a. s[:3]
    b. s[0:3]
    c. Both a and b
    d. s[1:3]
    Answer: c. Both a and bw3schools​
23. Which of the following is NOT a string method in Python?
    a. append()
    b. upper()
    c. split()
    d. strip()
    Answer: a. append()w3schools​
24. In the context of data analysis, which process involves standardizing text case?
    a. Tokenization
    b. Formatting
    c. Normalization
    d. Preprocessing
    Answer: d. Preprocessingsaidatascience+1​
25. What type of string is “12345”?
    a. Integer
    b. String
    c. List
    d. Float
    Answer: b. Stringw3schools​
26. Which method centers a string with whitespace in Python?
    a. center()
    b. middle()
    c. pad()
    d. align()
    Answer: a. center()jakevdp.github+1​
27. What does the split() method return?
    a. String
    b. List
    c. Tuple
    d. Dictionary
    Answer: b. Listjakevdp.github+1​
28. What is the result of “Data”.isalpha()?
    a. True
    b. False
    c. Error
    d. None
    Answer: a. Truew3schools​
29. Which string method would help convert “hello world” to “Hello World”?
    a. swapcase()
    b. capitalize()
    c. title()
    d. upper()
    Answer: c. title()w3schools​
30. Which data structure is typically used to store a collection of strings in data science with Pandas?
    a. Series
    b. List
    c. Tuple
    d. Set
    Answer: a. Seriesgeeksforgeeks+1​
31. Which method pads strings with zeroes on the left to a specified width?
    a. pad()
    b. lpad()
    c. zfill()
    d. fill()
    Answer: c. zfill()w3schools​
32. In data cleaning, which string operation helps remove unwanted characters?
    a. replace()
    b. insert()
    c. delete()
    d. add()
    Answer: a. replace()tutedude+1​
33. Which string method checks if a string ends with a certain substring?
    a. finish()
    b. ends()
    c. endswith()
    d. close()
    Answer: c. endswith()w3schools​
34. What is a fixed-length string?
    a. A string of infinite length
    b. A string with length set at compile time
    c. A variable-length string
    d. A dynamic string
    Answer: b. A string with length set at compile timewikipedia​
35. What does “Hello123”.isalnum() return?
    a. True
    b. False
    c. Error
    d. None
    Answer: a. Truew3schools​
36. Which string method in Python removes only leading whitespace?
    a. lstrip()
    b. strip()
    c. rstrip()
    d. trim()
    Answer: a. lstrip()w3schools​
37. Which Python function returns a substring starting from a specific index?
    a. substring()
    b. slice()
    c. str[index:]
    d. sub()
    Answer: c. str[index:]w3schools​
38. Which statement about strings in Python is correct?
    a. Strings are mutable
    b. Strings can be joined using “+”
    c. Strings cannot be stored in lists
    d. Strings can only contain letters
    Answer: b. Strings can be joined using “+”codecademy+1​
39. What is the output of “Python”.find(“y”)?
    a. 1
    b. 0
    c. 2
    d. -1
    Answer: a. 1w3schools​
40. Strings are widely used for which of the following in data science?
    a. Data cleaning
    b. Feature engineering
    c. NLP preprocessing
    d. All of the above
    Answer: d. All of the abovesaidatascience+1​
41. Which method returns True if the string is in title case?
    a. isupper()
    b. istitle()
    c. islower()
    d. istitlecase()
    Answer: b. istitle()w3schools​
42. Which Python standard library supports regex for string manipulation?
    a. re
    b. math
    c. datetime
    d. os
    Answer: a. rer4ds.hadley+1​
43. What is the output of “hello”.capitalize()?
    a. “Hello”
    b. “hello”
    c. “HELLO”
    d. “hello.”
    Answer: a. “Hello”w3schools​
44. Which method converts numeric strings to integers in Python?
    a. int()
    b. str()
    c. float()
    d. num()
    Answer: a. int()w3schools​
45. Which string method returns the number of times a substring appears?
    a. count()
    b. repeat()
    c. find()
    d. frequency()
    Answer: a. count()jakevdp.github+1​
46. Which attribute allows handling missing string data in Pandas?
    a. fillna()
    b. replace()
    c. dropna()
    d. empty()
    Answer: a. fillna()jakevdp.github​
47. For which application are strings least useful?
    a. Text Processing
    b. Data Serialization
    c. Image Processing
    d. Data Security
    Answer: c. Image Processingheycoach​
48. What does the string method .swapcase() do?
    a. Switches uppercase to lowercase, vice versa
    b. Reverses string
    c. Removes whitespace
    d. Joins strings
    Answer: a. Switches uppercase to lowercase, vice versaw3schools​
49. Which method would be used to split a string across a certain character or regex in Pandas?
    a. separate()
    b. split()
    c. extract()
    d. join()
    Answer: b. split()jakevdp.github+1​
50. Which Pandas method creates dummy variables from text data?
    a. get_dummies()
    b. to_numeric()
    c. to_string()
    d. split()
    Answer: a. get_dummies()jakevdp.github​

1. https://saidatascience.com/understanding-the-string-data-type-and-its-popular-methods-in-data-analysis/
2. https://www.w3schools.com/python/python_strings.asp
3. https://www.codecademy.com/learn/learn-python-3/modules/learn-python3-strings/cheatsheet
4. https://testbook.com/objective-questions/mcq-on-string-data-type–60014612a1f01e033fa34694
5. https://www.geeksforgeeks.org/dsa/string-data-structure/
6. https://www.w3schools.com/python/python_ref_string.asp
7. https://jakevdp.github.io/PythonDataScienceHandbook/03.10-working-with-strings.html
8. https://tutedude.com/blogs/python-string-manipulation/
9. https://www.geeksforgeeks.org/python/python-string/
10. https://en.wikipedia.org/wiki/String_(computer_science)
11. https://r4ds.hadley.nz/strings.html
12. https://heycoach.in/blog/real-world-applications-of-strings/
13. https://www.sanfoundry.com/python-multiple-choice-questions-answers/
14. https://www.geeksforgeeks.org/quizzes/string-data-structure-quiz-for-beginners/
15. https://csiplearninghub.com/mcq-on-python-string-class-11/
16. https://www.scribd.com/document/787082322/MCQ-Strings-Gr-10
17. https://pynative.com/python-string-quiz/
18. https://www.examveda.com/java-program/practice-mcq-question-on-strings/
19. https://www.scientecheasy.com/2025/04/python-string-quiz.html/
20. https://www.learnpython.org/en/Basic_String_Operations