Correct answer is : C

isalpha() - Return true if all characters in the string are alphabetic and there is at least one character, false otherwise

Correct answer is : A

isascii() - Return true if the string is empty or all characters in the string are ASCII

Correct answer is : C

Return true if all characters in the string are decimal characters and there is at least one character, false otherwise

>>> "123".isdecimal(), "asd".isdecimal(), "".isdecimal(), "asd123".isdecimal(), "123.13".isdecimal()
(True, False, False, False, False)

Correct answer is : A

Refer to - https://www.includehelp.com/python/difference-between-string-isdecimal-isdigit-isnumeric-and-methods.aspx

Correct answer is : B

Return true if all cased characters in the string are lowercase and there is at least one cased character, false otherwise.

In "12aA".islower() , A is an uppercase letter

Correct answer is : A

str.istitle()- Return true if the string is a titlecased string and there is at least one character, for example uppercase characters may only follow uncased characters and lowercase characters only cased ones. Return false otherwise.

"This Is Title".istitle() give True

For this "This'Is1Title".istitle() -> title() considers This, Is and Title as separate words and provides True

Correct answer is : A

find() gives lowest index and rfind() gives highest index of "is" respectively 

Correct answer is : A

Refer to - https://docs.python.org/3/library/stdtypes.html#str.rstrip

Correct answer is : D

Refer to  - https://docs.python.org/3/library/stdtypes.html#str.partition