Javascript Online Test

1. isNaN()

2. nonNaN()

3. NaN()

4. None of the above

Correct Answer : A

1. if(a!=null)

2. if (!a)

3. if(a!null)

4. if(a!==null)

Correct Answer : D

1. <script src="demo.js">

2. <script source="demo.js">

3. <script ref="demo.js">

4. <script type="demo.js">

Correct Answer : A

1. High level programming language

2. Assembly level programming language

3. Machine level programming language

4. Low level programming language

Correct Answer : A

1. Floating numbers

2. Representation of functions that returns a value

3. \f is not present in JavaScript

4. Form feed

Correct Answer : D

1. closePath()

2. close()

3. connectlast(first)

4. connect()

Correct Answer : A

1. RMI

2. Triggering Event

3. Preprocessor

4. Function/Method

Correct Answer : D

1. JSONTokener

2. JSONParser

3. JParser

4. ParserJ

Correct Answer : A

1. decrements the total length by 1

2. increments the total length by 1

3. prints the first element but no effect on the length

4. updates the element

Correct Answer : A

1. JSON.eval()

2. JSON.parse()

3. jQuery.parseJSON()

4. eval()

Correct Answer : A

1. Variable used in the code doesn't exist

2. Variable is not assigned to any value

3. Property doesn't exist

4. All of the above

Correct Answer : D

1. Netscape

2. Bell Labs

3. Sun Microsystems

4. IBM

Correct Answer : A

1. pop()

2. push()

3. join()

4. map()

Correct Answer : B

1. AvailHeight

2. ColorsDepth

3. AvailWidth

4. ColorDepth

Correct Answer : B

1. All three statements are true

2. Used to reform generic objects into instances of pseudo-classes

3. A function that will be called for every key and value at every level of the final result

4. Each value will be replaced by the result of the reviver function

Correct Answer : A

1. Class, parameters, object’s extensible flag

2. Prototype, class, objects’ parameters

3. Prototype, class, object’s extensible flag

4. Native object, Classes and Interfaces and Object’s extensible flag

Correct Answer : C

const pi=3.14;
var pi=4;
console.log(pi);

1. This will flash an error

2. Prints 4

3. Prints 3.14

4. Ambiguity

Correct Answer : A

var a = 10;
var b = 0;
document.write(a/b);

1. Nothing is printed

2. 0 is printed

3. Infinity is printed

4. Some Garbage Value

Correct Answer : C

1. Size constraints of JSON

2. Cross-domain communication

3. Future proofing JSON as JavaScript changes.

Correct Answer : B

{ "employee" : { "type" : "Director", "functions" : ['sales', 'marketing'], "hireDate" : "March 8, 2011" } }

1. March 8, 2011

2. String

3. Date

4. Number

Correct Answer : B

1. JavaScript Object Nomenclature

2. JavaScript Objective Notation

3. JavaScript Object Notation

4. JavaScript Orientated Nomenclature

Correct Answer : C

1. Ada

2. Pascal

3. Modula2

4. Html

Correct Answer : D

1. JSON Procedures

2. JSON Parsing

3. JSON with padding

4. JSON Programming

Correct Answer : C

1. Single Quote

2. Double Quote

3. Single Quote or Double Quote

Correct Answer : B

1. Get the object

2. Dereference the current scope chain

3. Reference the current scope chain

4. Return the value

Correct Answer : C

1. It can not Handling dates and time.

2. JavaScript is a object-based scripting language.

3. JavaScript is not interpreter based scripting language.

4. All of the above

Correct Answer : B

1. slice()

2. split()

3. substr()

4. substring()

Correct Answer : D

1. .jn

2. .js

3. .jsn

4. .json

Correct Answer : D

1. JSON.parse(null);

2. JSON.parse('{}');

3. JSON.parse(undefined);

4. JSON.parse('[]');

Correct Answer : C

1. { "letters" : [ "a", "b", "c"; ] }

2. { 'letters' : {"a", "b", "c" } }

3. { "letters" : [ a, b, c ] }

4. { "letters" : [ "a", "b", "c" ] }

Correct Answer : D