Crack CBSE Python Questions on Tokens

Below are few CBSE Python Questions on Tokens (2 marks).

1)Identify which Python token are these?

1. and   
2. _value   
3. True 
4.  <=

Ans.

1.              Keyword
2.              Identifiers
3.              Boolean literals
4.              Relational Operator  

2)Determine the  type of literals below.

1.              -19

2.              0o12

3.              0XFACE

Ans.

1.            Decimal integer literals
2.            Octal Integer Literals
3.            Hexadecimal Integer Literals  

3)Identify which of the following as valid variable names, state reason if invalid.

1.       _ 100
2.      var.1
3.      break
4.      A463
5.      T 204

Ans.

1.       Valid as it begins with (underscore).
2.       Invalid, dot (.) is not allowed.
3.       Invalid, as break is a keyword.
4.       Valid
5.       Invalid, space is not allowed.  

4)Identify the following literals as character/string literals:

1.      \t 
2.      A1 
3.      Nilam Sing#?9
4.      \56

Ans.

1.       Character
2.       String
3.       String
4.       String  

5)What will be the sizes of following constants 

1.    ‘\a’   
2.   “\a” 
3.    “it’s” 
4.   ‘\”’ 
5.    “Reema\’s”  

Ans.                                       

1.  ‘\a’   – Size is 1 as there is 1 character and it is a string literal enclosed in single quotes
2. “\a”  – Size is 1 as there is 1 character enclosed in double quotes 
3.  “it’s” – Size is 4. Python allows single quotes                                    
4.  ‘\”’    – size is 1                                      
5.  “Reema\’s”- Size is 7 (\’ is considered as single character)    

6)Which of the following are valid comments?

1.       /* comment */ 
2.      */comment*/
3.      ‘’’ comment 
4.      //comment

Ans.

Comments a and d is valid.

7)What is equivalent scientific notation of following:

1.   5.18 x 10⁸ 
2.   25.4821 
3.   0.641 x 10^-3 
4.   36.148

Ans.

1.       5.18E + 08
2.       2.54821E + 01
3.       6.41E-04
4.       3.6148E + 01  

8)What is escape sequence for new line and vertical tab?

Ans. “\n” for new line and “\v” for Vertical tab.

9)Identify the following literals:

1.       0.23 
2.      True 
3.      ‘b’ 
4.     “a”

Ans.

1.     Floating point literal
2.     Boolean literal
3.     Character literal
4.     String literal  

10)Identify errors in following statements and correct them:

1.      number = 5,000 
2.      byte x= = 3
3.      x/10 = y 
4.      number = +20     

Ans. correct statement:

1.         number = 5000
2.         byte = 3
3.         y= x/10
4.         number += 20