Javascript MCQ Number 01123

Javascript MCQ Set 1

1. The unordered collection of properties, each of which has a name and a value is called
a) String
b) Object
c) Serialized Object
d) All of the mentioned

2. The object has three object attributes namely
a) Class, parameters, object’s extensible flag
b) Prototype, class, objects’ parameters
c) Prototype, class, object’s extensible flag
d) Native object, Classes and Interfacces and Object’s extensible flag

3. Consider the following code snippet :

var book = {
              "main title": "JavaScript", 
              'sub-title': "The Definitive Guide", 
              "for": "all audiences", 
              author: { 
                         firstname: "David", 
                         surname: "Flanagan" 
                      }
           };

In the above snippet, firstname and surname are
a) properties
b) property values
c) property names
d) objects

4. A linkage of series of prototype objects is called as :
a) prototype stack
b) prototype chain
c) prototype class
d) prototypes

5. Consider the below given syntax

book[datatype]=assignment_value;

In the above syntax, the datatype within the square brackets must be
a) An integer
b) A String
c) An object
d) None of the mentioned

6. To determine whether one object is the prototype of (or is part of the prototype chain of) another object, one should use the
a) isPrototypeOf() method
b) equals() method
c) === operator
d) none of the mentioned

7. Consider the following code snippet

function f() {};

The above prototype represents a
a) Function f
b) A custom constructor
c) Prototype of a function
d) Not valid

8. The purpose of extensible attribute is to
a) make all of the own properties of that object nonconfigurable
b) to configure and bring a writable property
c) “lock down” objects into a known state and prevent outside tampering
d) all of the mentioned

9. Identify the process done in the below code snippet

o = {x:1, y:{z:[false,null,""]}}; 
s = JSON.stringify(o); 
p = JSON.parse(s);

a) Object Encapsulation
b) Object Serialization
c) Object Abstraction
d) Object Encoding

10. The basic purpose of the toLocaleString() is to
a) return a localised object representation
b) return a parsed string
c) return a local time in the string format
d) return a localized string representation of the object

Javascript MCQ Set 2

1. When does the browser stop rendering the HTML?
a) Inline JavaScript block
b) External JavaScript file
c) Both Inline JavaScript block & External JavaScript file
d) None of the mentioned

2. Which of the following handles painting the content on to the screen?
a) Rendering engine
b) JavaScript Interpreter
c) UI Layer
d) Network Layer

3. What does the rendering engine do when it encounters JavaScript?
a) Skips the code
b) Continues painting
c) Switches to Javascript Interpreter
d) None of the mentioned

4. Which of the following runs the JavaScript code?
a) Just In Time compiler
b) JavaScript Interpreter
c) Both Just In Time compiler and JavaScript Interpreter
d) None of the mentioned

5. Which of the following layer retrieves the content from the network?
a) Transport Layer
b) Application Layer
c) Network Layer
d) Physical Layer

6. Which of the following gets converted to DOM elements by the rendering engine?
a) Tokens
b) Strings
c) Address
d) All of the mentioned

7. Which of the below does not belong to the Render Engine work flow?
a) Paint DOM elements
b) Parse Content
c) Build DOM nodes in render tree
d) None of the mentioned

8. Which is the next step after retrieving the content in chunks?
a) Paint DOM elements
b) Parse Content
c) Build DOM nodes in render tree
d) None of the mentioned

9. What will happen after executing the script?
a) Execute script
b) Layout positioning of DOM elements
c) Paint DOM elements
d) Build DOM nodes in render tree

10. What would happen if there were no script tags?
a) Build DOM nodes in render tree
b) Layout positioning of DOM elements
c) Paint DOM elements
d) Execute script

Javascript MCQ Set 3

1. The ‘$’ present in the RegExp object is called a
a) character
b) matcher
c) metacharacter
d) metadata

2. Consider the following statement containing regular expressions

var text = "testing: 1, 2, 3"; 
var pattern = /d+/g;

In order to check if the pattern matches, the statement is
a) text==pattern
b) text.equals(pattern)
c) text.test(pattern)
d) pattern.test(text)

3. The regular expression to match any one character not between the brackets is
a) […].
b) [^].
c) [^…].
d) [D].

4. What does /[^(]* regular expression indicate ?
a) Match one or more characters that are not open paranthesis
b) Match zero or more characters that are open paranthesis
c) Match zero or more characters that are not open paranthesis
d) Match one or more characters that are open paranthesis

5. What will be the result when non greedy repetition is used on the pattern /a+?b/ ?
a) Matches the letter b preceded by the fewest number of a’s possible
b) Matches the letter b preceded by any number of a
c) Matches letter a preceded by letter b, in the stack order
d) None of the mentioned

6. What does the subexpression /java(script)?/ result in ?
a) It matches “java” followed by the optional “script”
b) It matches “java” followed by any number of “script”
c) It matches “java” followed by a minimum of one “script”
d) None of the mentioned

7. What is the most essential purpose of parantheses in regular expressions ?
a) Define pattern matching techniques
b) Define subpatterns within the complete pattern
c) Define portion of strings in the regular expression
d) All of the mentioned

8. The method that performs the search-and-replace operation to strings for pattern matching is
a) searchandreplace()
b) add()
c) edit()
d) replace()

9. What would be the result of the following statement in JavaScript using regular expression methods ?
a) Returns [“123″”456″”789”].
b) Returns [“123″,”456″,”789”].
c) Returns [1,2,3,4,5,6,7,8,9].
d) Throws an exception

10. Consider the following code snippet

    var pattern = /Java/g;
    var text = "JavaScript is more fun than Java!";
    var result;
    while ((result = pattern.exec(text)) != null) 
    {
        alert("Matched '" + result[0] + "'" +" at position " + result.index +"; next search begins at " + pattern.lastIndex);
    }

What purpose does exec() solve in the above code ?
a) Returns the same kind of array whether or not the regular expression has the global g flag
b) Returns different arrays in the different turns of iterations
c) All of the mentioned
d) None of the mentioned

Javascript MCQ Set 4

1. How many read-only attributes are present in the navigator object?
a) 1
b) 2
c) 3
d) 4

2. Why are HTTP redirects significant?
a) TCP connection available
b) Complete roundtrip absent
c) Complete roundtrip present
d) None of the mentioned

3. Where does the DNS reply go to in a single HTTP redirect?
a) Browser
b) Client
c) Server
d) DNS Server

4. How can one access the redirectCount property?
a) navigation.redirectCount
b) performance.navigation.redirectCount
c) performance.redirectCount
d) redirectCount

5. How many constant values can the property type be represented?
a) 2
b) 3
c) 4
d) 5

6. Which of the following constants has the value 255?
a) TYPE_NAVIGATE
b) TYPE_RELOAD
c) TYPE_BACK_FORWARD
d) TYPE_RESERVED

7. What is the purpose of the constant TYPE_RELOAD?
a) Reload performed
b) Reload not performed
c) Reload must be performed
d) None of the mentioned

8. What does the constant TYPE_BACK_FORWRD indicate?
a) Navigation via browser history
b) Navigation via user request
c) Navigation via URL
d) None of the mentioned

9. Which of the following constants hold the value 2?
a) TYPE_NAVIGATE
b) TYPE_RELOAD
c) TYPE_BACK_FORWARD
d) TYPE_RESERVED

10. Where does the DNS Lookup direct to ?
a) Browser
b) Client
c) Server
d) DNS Server

Javascript MCQ Set 5

1. How many read-only attributes are present in the navigator object?
a) 1
b) 2
c) 3
d) 4

2. Why are HTTP redirects significant?
a) TCP connection available
b) Complete roundtrip absent
c) Complete roundtrip present
d) None of the mentioned

3. Where does the DNS reply go to in a single HTTP redirect?
a) Browser
b) Client
c) Server
d) DNS Server

4. How can one access the redirectCount property?
a) navigation.redirectCount
b) performance.navigation.redirectCount
c) performance.redirectCount
d) redirectCount

5. How many constant values can the property type be represented?
a) 2
b) 3
c) 4
d) 5

6. Which of the following constants has the value 255?
a) TYPE_NAVIGATE
b) TYPE_RELOAD
c) TYPE_BACK_FORWARD
d) TYPE_RESERVED

7. What is the purpose of the constant TYPE_RELOAD?
a) Reload performed
b) Reload not performed
c) Reload must be performed
d) None of the mentioned

8. What does the constant TYPE_BACK_FORWRD indicate?
a) Navigation via browser history
b) Navigation via user request
c) Navigation via URL
d) None of the mentioned

9. Which of the following constants hold the value 2?
a) TYPE_NAVIGATE
b) TYPE_RELOAD
c) TYPE_BACK_FORWARD
d) TYPE_RESERVED

10. Where does the DNS Lookup direct to ?
a) Browser
b) Client
c) Server
d) DNS Server

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