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Chapter – 5: STRING MANIPULATION || Computer Science || Class 11

 

Chapter – 5: STRING MANIPULATION

Very Short answer Type Questions

Q.1   which of the following is not a Python legal string operation?

         (a)‟abc‟+‟abc‟                (b) „abc‟*3              (c)‟abc‟ + 3  (d)‟abc‟.lower()

Ans: (c) ‗abc‘ + 3

Q.2    Out of the following operators, which ones can be used with strings?

       =,  -,  *,  /,  //,  %,  >,  <>,  in,  not in,  <=

Ans: /, // and %

Q.3     From the string S = “CARPE DIEM”. Which ranges return “DIE” and “CAR”? Ans: S[6:9] for ―DIE‖ and S[0:3] for ―CAR‖

 

 

Q.4   Given a string S = “CARPE DIEM”. If n is length/2 then what would following return?

           (a) S[:n]      (b) S[n:] (c) S[n:n]     (d) S[1:n]    (e) S[n:length-1] Ans: (a) “CARPE‖ (b) “DIEM” (c) „ ‟  (d) “ARPE” (e) “DIE

 

Q.5           What would following expression return?

           (a) ”Hello World”.upper().lower()                                                                                                (b) ”Hello World”.lower().upper()

             (c) ”Hello World”.find(“Wor”,1,6)                                                                                                (d) ”Hello World”.find(“Wor”)

              (e) ”Hello World”.find(“wor”)                                                                                                (f) ”Hello World”.isalpha()

              (g) ”Hello World”.isalnum()                                                                           (h) ”Hello World”.isdigit()

(i) “123FGH”.isdigit()

Ans: (a) 'hello world'                                                                                        (b) 'HELLO WORLD'

           (c) -1                                                                                   (d) 6

              (e) -1                                                                                (f) False

              (g) False                                                                            (h) False

(i) False

Short Answer Type Questions  Q.1 What is a string slice? How is it useful?

Ans: String Slice is a part of a string containing some contiguous characters from the string. It is accessed from the string by providing a range in ―[ ]‖ brackets i.e. S [n:m]. Python returns all the characters at indices n, n+1, n+2 . . . m-1 e.g.

         ‗Barabanki‘.[4:7] will return ‗ban‘.

Q.2     Write a python script that traverses through an input string and prints its characters in different lines – two characters per line.

Ans: 

 

 

 

 

 

 

Q.3     Which functions would you chose to use to remove leading and trailing white spaces from a given string?

Ans: Python String strip() function will remove leading and trailing whitespaces. If you want to

remove only leading or trailing spaces, use lstrip() or rstrip() function instead.

Q.4     Suggest appropriate functions for the following tasks –  (a) To check whether the string contains digits.

(b)  To find the occurrence a string within another string.  

(c)  To convert the first letter of a string to upper case.

(d)  To convert all the letters of a string to upper case.

(f)   To check whether all the letters of the string are in capital letters.

(g)  to remove all the white spaces from the beginning of a string.

Ans: (a) isalnum()                         (b) find()                                                                    (c) capitalize()                         

              (d) upper()                      (f) isupper()                                    (g) lstrip()

Q.5     Find the errors - 

                      s=”PURA VIDA”

                      Print(s[9] + s[9:15])

Ans: Here the error is : Sting index out of range.

 

Q.6      Find the output – if we give input as “Hello”

                  

 

 

Ans: output 1 output2

 

 

 

 

 

 

Skill Based Questions

Q.1 WAP to print following pattern without using any nested loop.

           #

           # #                          Ans:

           # # #

           # # # #

           # # # # # 

Q.2                     WAP to print the number of occurrences of a substring into a line. 

Ans:  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q.3             WAP to check the given string is palindrome or not.

Ans:  

 

 

 

 

 

 

 

 

Q.4     WAP that:

o        Prompt the user for a string o             Extract all the digits from the string.

o        If there are digits 

§     Sum the collected digits together.

§     Printout:

        The original string

        The digits

        The sum of the digits 

o        If there are no digits 

§     Print the original string 

§     A message “Has no Digits” Ans: 

 

 

 

 

 

 

 

 

 

 

 

 

 

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