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1. What is the output of `str1[::-1]` if `str1 = 'Hello World!'`?

A) `Hello World!`
B) `World Hello!`
C) `!dlroW olleH`
D) `!Hello World`

ANSWER= C) `!dlroW olleH`

2. What is the result of `str1[1:5]` if `str1 = 'Hello World!'`?

A) `Hell`
B) `ello`
C) `World`
D) `o Wor`

ANSWER= B) `ello`

3. Which of the following methods returns the string with the first letter of every word in uppercase and the rest in lowercase?

A) `lower()`
B) `upper()`
C) `title()`
D) `capitalize()`

ANSWER= C) `title()`

4. Which function would you use to find the length of a string `str1`?

A) `len()`
B) `length()`
C) `size()`
D) `count()`

ANSWER= A) `len()`

5. In Python, what will be the output of `str1[6:]` if `str1 = 'Hello World!'`?

A) `Hello`
B) `World`
C) `World!`
D) `o World!`

ANSWER= C) `World!`

6. What does the slice operation `str1[n:m:k]` do?

A) Extracts every k-th character from the string starting from n to m-1
B) Extracts every k-th character from the string starting from m to n-1
C) Extracts every k-th character from the string starting from n to m
D) Extracts every k-th character from the string starting from m to n

ANSWER= A) Extracts every k-th character from the string starting from n to m-1

7. What will be the output of the following code? `str1 = 'Hello World!' print(str1[-1])`

A) `H`
B) `!`
C) `d`
D) `o`

ANSWER= B) `!`

8. If `str1 = 'Hello World!'`, what will be the result of `str1[2+4]`?

A) `H`
B) `o`
C) `W`
D) `e`

ANSWER= C) `W`

9. Which method returns the string in reverse order?

A) `reverse()`
B) `[::-1]`
C) `reversed()`
D) `flip()`

ANSWER= B) `[::-1]`

10. What is the output of `str1[7:2]` if `str1 = 'Hello World!'`?

A) `Hello`
B) `World`
C) `o Wor`
D) `''`

ANSWER= D) `''`

11. What will the following code print? `str1 = 'hello WORLD!' print(str1.title())`

A) `Hello World!`
B) `Hello world!`
C) `HELLO WORLD!`
D) `hello WORLD!`

ANSWER= A) `Hello World!`

12. Which of the following is not a valid string method?

A) `isalpha()`
B) `isdigit()`
C) `isalnum()`
D) `isnumber()`

ANSWER= D) `isnumber()`

13. What does the built-in function `len()` return when applied to a string?

A) The number of words in the string
B) The number of characters in the string
C) The number of vowels in the string
D) The number of spaces in the string

ANSWER= B) The number of characters in the string

14. Which method would you use to convert all characters of a string to lowercase?

A) `lower()`
B) `upper()`
C) `capitalize()`
D) `title()`

ANSWER= A) `lower()`

15. If `str1 = 'Hello World!'`, what will `str1.split()` return?

A) `['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd', '!']`
B) `['Hello', 'World!']`
C) `['Hello World!']`
D) `['Helloworld']`

ANSWER= B) `['Hello', 'World!']`

16. What will the following code print? `str1 = 'Hello World!' print(str1.replace('World', 'Everyone'))`

A) `Hello Everyone!`
B) `Hello World!`
C) `Hello`
D) `Everyone`

ANSWER= A) `Hello Everyone!`

17. What does the `strip()` method do?

A) Removes all characters from the string
B) Removes spaces from the beginning and end of the string
C) Removes a specified character from the string
D) Removes all vowels from the string

ANSWER= B) Removes spaces from the beginning and end of the string

18. Which method would you use to check if a string starts with a specific substring?

A) `startswith()`
B) `endswith()`
C) `start()`
D) `begin()`

ANSWER= A) `startswith()`

19. Which function would you use to convert a string to an integer?

A) `str()`
B) `int()`
C) `float()`
D) `chr()`

ANSWER= B) `int()`

20. What will `str1.index('W')` return if `str1 = 'Hello World!'`?

A) `5`
B) `6`
C) `7`
D) `8`

ANSWER= B) `6`

21. How can you iterate over each character in a string using a `for` loop?

A) `for ch in str1:`
B) `for each ch in str1:`
C) `for str1 in ch:`
D) `for each in str1:`

ANSWER= A) `for ch in str1:`

22. What will the following code output? `str1 = 'Hello World!' for ch in str1: print(ch, end='')`

A) `H e l l o W o r l d !`
B) `Helloworld`
C) `Hello World!`
D) `Helloworld!`

ANSWER= C) `Hello World!`

23. Which of the following is true about string immutability in Python?

A) Strings can be modified after creation
B) Strings cannot be modified after creation
C) Only the first character of a string can be modified
D) Only the last character of a string can be modified

ANSWER= B) Strings cannot be modified after creation

24. Which method would you use to join elements of a list into a string?

A) `concat()`
B) `append()`
C) `join()`
D) `combine()`

ANSWER= C) `join()`

25. What will the following code output? `str1 = 'Hello' str2 = 'World' print(str1 + str2)`

A) `Hello World`
B) `HelloWorld`
C) `WorldHello`
D) `Hello World!`

ANSWER= B) `HelloWorld`

26. Which method would you use to find if a string contains only digits?

A) `isdigit()`
B) `isalpha()`
C) `isalnum()`
D) `isspace()`

ANSWER= A) `isdigit()`

27. What will the following code print? `str1 = 'Hello World!' print(str1.count('o'))`

A) `1`
B) `2`
C) `3`
D) `0`

ANSWER= B) `2`

28. What is the output of `str1.find('o')` if `str1 = 'Hello World!'`?

A) `4`
B) `5`
C) `7`
D) `6`

ANSWER= A) `4`

29. Which of the following methods will return the position of the first occurrence of a substring?

A) `find()`
B) `index()`
C) `count()`
D) `search()`

ANSWER= A) `find()`

30. What will the following code print? `str1 = 'Hello World!' print(str1.upper())`

A) `HELLO WORLD!`
B) `hello world!`
C) `Hello World!`
D) `hello world`

ANSWER= A) `HELLO WORLD!`

31. Which method can be used to replace parts of a string with another string?

A) `change()`
B) `replace()`
C) `swap()`
D) `substitute()`

ANSWER= B) `replace()`

32. What is the result of `str1.split(',')` if `str1 = 'apple,banana,grape'`?

A) `['apple banana grape']`
B) `['apple', 'banana', 'grape']`
C) `['apple', 'banana grape']`
D) `['applebanana', 'grape']`

ANSWER= B) `['apple', 'banana', 'grape']`

33. How can you concatenate strings in Python?

A) Using the `+` operator
B) Using the `concat()` method
C) Using the `append()` method
D) Using the `join()` method

ANSWER= A) Using the `+` operator

34. What does the `format()` method do in Python strings?

A) It converts strings to uppercase
B) It formats the string by replacing placeholders with values
C) It splits the string into a list
D) It joins a list into a string

ANSWER= B) It formats the string by replacing placeholders with values

35. Which of the following methods checks if all characters in a string are alphanumeric?

A) `isalpha()`
B) `isdigit()`
C) `isalnum()`
D) `isnum()`

ANSWER= C) `isalnum()`

36. What will the following code print? `str1 = 'Hello World!' print(str1.swapcase())`

A) `hello world!`
B) `HELLO WORLD!`
C) `hELLO wORLD!`
D) `Hello World!`

ANSWER= C) `hELLO wORLD!`

37. Which method would you use to pad a string with zeros on the left?

A) `zfill()`
B) `lpad()`
C) `rpad()`
D) `pad()`

ANSWER= A) `zfill()`

38. What will `str1.rfind('l')` return if `str1 = 'Hello World!'`?

A) `2`
B) `3`
C) `9`
D) `10`

ANSWER= C) `9`

39. What does the `partition()` method do?

A) Splits the string into parts
B) Returns a tuple with three parts: the part before the separator, the separator itself, and the part after the separator
C) Joins parts of a string into one
D) Converts the string into a list

ANSWER= B) Returns a tuple with three parts: the part before the separator, the separator itself, and the part after the separator

40. What is the result of `str1.isupper()` if `str1 = 'HELLO WORLD!'`?

A) `True`
B) `False`
C) `None`
D) `Error`

ANSWER= A) `True`

41. Which method returns `True` if a string contains only whitespace characters?

A) `isspace()`
B) `isblank()`
C) `iswhitespace()`
D) `isempty()`

ANSWER= A) `isspace()`

42. What will the following code print? `str1 = 'Hello World!' print(str1.center(20, '*'))`

A) `Hello World!`
B) ` Hello World! `
C) ` *Hello World! *`
D) ` Hello World! `

ANSWER= C) ` *Hello World! *`

43. Which method can be used to check if all characters in the string are lowercase?

A) `islower()`
B) `isupper()`
C) `isalpha()`
D) `islowercase()`

ANSWER= A) `islower()`

44. Which method removes characters from both ends of a string?

A) `strip()`
B) `trim()`
C) `cut()`
D) `delete()`

ANSWER= A) `strip()`