Objective Questions on Javascript

Questions

1 The Crockford’s subset does not include which function in JavaScript?

A eval()

B coeval()

C equal()

D equivalent()

View Answer

Answer: eval()

2 What does javascript use instead of == and !=?

A It uses bitwise checking

B It uses === and !== instead

C It uses equals() and notequals() instead

D It uses equalto()

View Answer

Answer: It uses === and !== instead

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3 What is being imposed on each subset to ensure that it conforms to the subset?

A A parser to parse the code

B A parser that parses and adds to the subset

C A static verifier that parses code

D A predefined function to parse the code

View Answer

Answer: A static verifier that parses code

4 Why was “The Good Parts” designed as a language subset in JavaScript?

A To improve programmer flexibility

B To balance the workload of the programmer

C To create an in-built compiler and interpreter

D To improve programmer productivity

View Answer

Answer: To improve programmer productivity

5 Which is the subset that is a secure container designed for the purpose of safely running untrusted JavaScript?

A Sandbox

B The Good Parts

C Both Sandbox and Good Parts

D Web browser

View Answer

Answer: Sandbox

6 Why is this keyword not preferred in JavaScript?

A Highly memory consuming

B Functions should access the global objects

C Functions should not access the global objects

D Very inefficient to use

View Answer

Answer: Functions should not access the global objects

7 Which are the two functions that are not allowed in any secure subset?

A evaluate() and restrict()

B eval() and the Function() constructor

C debugger() and test()

D eval() and debugger()

View Answer

Answer: debugger() and test()

8 Which is the object that defines methods that allow complete control over page content?

A The client-side document object

B The server-side document object

C Both client-side and server-side document object

D Web document object

View Answer

Answer: The client-side document object

9 Which was one of the first security subsets proposed?

A FBJS

B Caja

C dojox.secure

D ADSafe

View Answer

Answer: ADSafe

10 Which is the subset that transforms web content into secure modules that can be safely hosted on a web page?

A Microsoft Web Sandbox

B ADsafe

C Caja

D dojox.secure

View Answer

Answer: dojox.secure

11 What will be the output of the following JavaScript code?

var set = new Set();  
set.add("one");  
set.add("two");    
for (let elements of set) 
{  
    document.writeln(elements+" ");  
}

A one

B two

C one two

D undefined

View Answer

Answer: one two

12 What will be the output of the following JavaScript code?

set.add("AngularJS");  
set.add("Bootstrap");    
set.delete("Bootstrap");  
document.writeln(set.size);

A 2

B 1

C 0

D Undefined

View Answer

Answer: 1

13 What will be the output of the following JavaScript code?

set.add("one");  
set.add("two");  
set.add("three");    
set.clear();  
document.writeln(set.size);

A one

B 1

C 2

D 0

View Answer

Answer: 0

14 What will be the output of the following JavaScript code?

set.add("one");  
set.add("two”);
var itr=set.values();  
document.writeln(itr.next().value);

A one

B two

C error

D undefined

View Answer

Answer: one

15 What will be the output of the following JavaScript code?

set.add("1");  
set.add("2");    
document.writeln(set.has("3"));

A 3

B true

C false

D 2

View Answer

Answer: false

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