Frontend Development Quiz 7

What is JavaScript?

• JavaScript is a scripting language used to make the website interactive

• JavaScript is an assembly language used to make the website interactive

• None of the mentioned

• JavaScript is a compiled language used to make the website interactive

Which of the following is correct about JavaScript?

• a) JavaScript is an Object-Based language

• b) JavaScript is Assembly-language

• c) JavaScript is an Object-Oriented language

• d) JavaScript is a High-level language

3. Among the given statements, which statement defines closures in JavaScript?

• a) JavaScript is a function that is enclosed with references to its inner function scope

• b) JavaScript is a function that is enclosed with references to its lexical environment

• c) JavaScript is a function that is enclosed with the object to its inner function scope

• d) None of the mentioned

4. What will be the output of the following JavaScript code snippet?

<p id="demo"></p>

var txt1 = "Sanfoundry_";

var txt2 = "Javascriptmcq";

document.getElementById("demo").innerHTML = txt1 + txt2;

• a) error

• b) Sanfoundry_ Javascriptmcq

• c) undefined

• d) Sanfoundry_Javascriptmcq

5. What will be the output of the following JavaScript code?

<p id="demo"></p>

<script>

var js = 10;

js *= 5;

document.getElementById("demo").innerHTML = js;

</script>

• a) 10

• b) 50

• c) 5

• d) Error

6. Arrays in JavaScript are defined by which of the following statements?

• a) It is an ordered list of values

• b) It is an ordered list of objects

• c) It is an ordered list of string

• d) It is an ordered list of functions

7. What will be the output of the following JavaScript code?

// JavaScript Comparison Operators

function compare()

{

int num=2;

char b=2;

if(a==b)

return true;

else

return false;

}

• a) false

• b) true

• c) compilation error

• d) runtime error

8. Will the following JavaScript code work?

var js = (function(x) {return x*x;}(10));

• a) Exception will be thrown

• b) Memory leak

• c) Error

• d) Yes, perfectly

9. Which of the following is not javascript data types?

• a) Null type

• b) Undefined type

• c) Number type

• d) All of the mentioned

10. Where is Client-side JavaScript code is embedded within HTML documents?

• a) A URL that uses the special javascript:code

• b) A URL that uses the special javascript:protocol

• c) A URL that uses the special javascript:encoding

• d) A URL that uses the special javascript:stack