JavaScript - Quiz

What will be the output of the following JavaScript code? 

let a = 12;
function show() {
    var a = 22;
    console.log(a);
}
show();

  • A10
  • B22
  • CUndefined
  • DError

What will be the output of the following JavaScript code? 

var a = 12;
const a = 12;
{
    const a = 22;
    console.log(a);
}

  • A10
  • B22
  • CUndefined
  • DError

What will be the output of the following JavaScript code? 

const a = 11;
{
    const a = 22;
    {
        const a = 33;
        console.log(a);
    }    
}

  • A22
  • B33
  • CUndefined
  • D11

What does the JavaScript "boolean" primitive data type represent?

  • A Textual information
  • B Numeric values
  • C True or false values
  • D Objects and arrays

How is the JavaScript "symbol" primitive data type unique?

  • A It represents textual information
  • B It is immutable and unique
  • C It holds numeric values
  • D It denotes a deliberate absence of any object value

What does the JavaScript "typeof" operator return for a variable of the "undefined" primitive data type?

  • A "number"
  • B "undefined"
  • C "string"
  • D "boolean"

All user-defined objects and built-in objects are descendants of an object called Object?

  • Atrue
  • Bfalse

Which of the following function of Number object returns a string value version of the current number?

  • AtoString()
  • BtoFixed()
  • CtoLocaleString()
  • DtoPrecision()

Which of the following function of String object causes a string to be displayed in the specified size as if it were in a tag?

  • Afixed()
  • B fontcolor()
  • Cfontsize()
  • Dbold()

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