Page 232 - Web Applications (803) Class 12
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Previous Years’ Questions


                 1.  Identify the type of operator in the following statement:

                     a! = b                                                                                      [2023]
                     (a)  Arithmetic                             (b)  Comparison
                     (c)  Logical                                (d)  Assignment
                Ans.  (c)  Logical
                 2.  If a variable is declared without assigning any value, what is its type (datatype)?         [2023]
                     (a)  Float                                  (b)  Undefined
                     (c)  Integer                                (d)  String
                Ans.  (b)  Undefined

                 3.  What is the output of the following code snippet?                                           [2023]
                     document.write (Math.round (5.319))
                Ans.  5
                 4.  What is the use of isFinite() in JavaScript?                                                [2023]
                Ans.  The JavaScript isFinite() function determines whether or not the provided value is a finite number. It returns a
                    boolean value, which can be true or false.
                 5.  If A=10, B=2 C=4, then what will be the output of the following JavaScript statements?      [2023]
                     if ((A>B) && (B>C))
                        { document.write("Hi")

                        }
                     else
                        {
                        document.write("Bye")
                        }
                Ans.  Output will be Bye
                 6.  Which method in JavaScript allows to join all elements of an array into a string?           [2023]
                Ans.  Array join() method
                 7.  Consider the following declaration in JavaScript:                                           [2023]
                     varTxt= "Life is Beautiful"
                     Write a statement that will display the string in uppercase.
                Ans.  document.write("Life is Beautiful".toUpperCase());
                 8.  Jared wants to generate a combined list of fruits and vegetables. She has two arrays:       [2023]

                    var fruits = ["Guava", "Apple", "Mango"]
                     var vegetables = ["Spinach", "French beans"].
                     Which inbuilt JavaScript function can be used to join the two arrays?
                Ans.  The  concat()  method  will  combine  the  fruits  and  vegetables  arrays  into  a  single  array  –  var  arr3  =  fruits.
                    concat(vegetables).
                 9.  Define  objects  with  respect  to  JavaScript.  Also  give  one  difference  between  properties  and  methods  of
                    an object.                                                                                   [2023]

                Ans.  In JavaScript, objects are complex data structures that encapsulate data and behaviour. Properties are attributes
                    that store data, while methods are functions associated with the object, representing its behaviour.


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