JavaScript Quiz

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

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

• None of the mentioned

Which of the following is correct about JavaScript?

• JavaScript is an Object-Based language

• JavaScript is Assembly-language

• JavaScript is an Object-Oriented language

• JavaScript is a High-level language

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

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

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

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

• None of the mentioned

What will be the output of the following JavaScript code snippet? var txt1 = "Sanfoundry_"; var txt2 = "Javascriptmcq"; document.getElementById("demo").innerHTML = txt1 + txt2;

• error

• Sanfoundry_ Javascriptmcq

• undefined

• Sanfoundry_Javascriptmcq

What will be the output of the following JavaScript code? var js = 10; js *= 5; document.getElementById("demo").innerHTML = js;

• 10

• 50

• 5

• Error

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

• It is an ordered list of values

• It is an ordered list of objects

• It is an ordered list of string

• It is an ordered list of functions

What will be the output of the following JavaScript code? // JavaScript Comparison Operators function compare() { let a=2; let b=2.0; if(a==b) return true; else return false; }

• false

• true

• compilation error

• runtime error

What will be the output of the following JavaScript code snippet? // JavaScript Equalto Operators function equalto() { let num=10; if(num==="10") return true; else return false; }

• false

• true

• compilation error

• runtime error

Will the following JavaScript code work? var js = (function(x) {return x*x;}(10));

• Exception will be thrown

• Memory leak

• Error

• Yes, perfectly

Which of the following is not javascript data types?

• Null type

• Undefined type

• Number type

• All of the mentioned