javascript-test-december24

1 / 30

Which of the following is not JavaScript Data Types?

Undefined

Number

Boolean

Float

2 / 30

Find output of below Javascript addition code
document.write("1 plus 1 is " + 1 + 1);

1 plus 1 is 2

1 plus 1 is 11

1 plus 1 is 1 + 1

3 / 30

The pop() method of the array does which of the following task ?

decrements the total length by 1

increments the total length by 1

prints the first element but no effect on the length

updates the element

4 / 30

The _______ method of an Array object adds and/or removes elements from an array.

Reverse

Shift

Slice

Splice

5 / 30

What will be the output of the following JavaScript code?
num1=5;
function cal() {
num1=10;
num2=5;
num3=num2*num1;
console.log(num3);
}
cal();

100

error

6 / 30

Which of the following is not a valid JavaScript variable name?

2varaiblename

_firstvariable

myvariable12

None of the above

7 / 30

Syntax for creating a RegExp object:
1. var txt=new RegExp(pattern,attributes);
2. var txt=/pattern/attributes;
Which of the above mentioned syntax will correct?

1 only

2 only

Both 1 and 2

None of the above

8 / 30

What is defination of an undefined value in JavaScript?

Variable used in the code doesn't exis

Variable is not assigned to any value

Property doesn't exist

All of the above

9 / 30

What if you use parseInt() to convert a string containing decimal value?

Throws Error

It returns the decimal values in string form

If returns only the integer portion of the number

None of the listed option

10 / 30

What will happen, if the following JavaScript code is executed? var count =0;
while (count <10) { console.log(count); count++; }

An error is displayed

An exception is thrown

The values of count variable are logged or stored in a particular location or storage

The value of count from 0 to 9 is displayed in the console

11 / 30

Which of the following is an array method?

Map

Filter

Reduce

All of these

12 / 30

Which of the following method checks if its argument is not a number?

isNaN()

nonNaN()

NaN()

None of the above

13 / 30

Which symbol is used for comments in Javascript?

* *

* */

14 / 30

If para1 is the DOM object for a paragraph, what is the correct syntax to change the text within the paragraph?

para1.value="New Text";

para1.firstChild.nodeValue= "New Text";

para1.nodeValue="New Text"

para1="New Text"

15 / 30

The "function" and " var" are known as:

Keywords

Data types

Declaration statements

Prototypes

16 / 30

What will be the output of the following Javascript code?
var string1 = "Letsfindcourse";
var intvalue = 30;
alert( string1 + intvalue );

Letsfindcourse 30

Letsfindcourse30

Exception

17 / 30

Which of the following are the errors in JavaScript?

Load time errors

Run time errors:

Logical Errors:

All of the above

18 / 30

What is the correct syntax for referring to an external script called "LFC.js"?

19 / 30

Why so JavaScript and Java have similar name?

JavaScript is a stripped-down version of Java

JavaScript's syntax is loosely based on Java's

They both originated on the island of Java

None of the above

20 / 30

What if we put ++ operator inside if condition? find the output

Error

1010

21 / 30

How to get a particular value using the tagged name?

getElementbyID()

getElementsbyName()

getElementsbyTagName()

getTagName()

22 / 30

Which of the following is correct about features of JavaScript?

It can not Handling dates and time.

JavaScript is a object-based scripting language.

JavaScript is not interpreter based scripting language.

All of the above

23 / 30

Which company developed JavaScript?

Netscape

Bell Labs

Sun Microsystems

IBM

24 / 30

Which of the following is block scoped?

Var

Let

Const

Both b and c

25 / 30

Variable declared is example of ________________ Variable.
function message() {
var varname = "Rajiv";
alert(name);
}

Local

Global

semi-global

All of the above

26 / 30

Choose the correct JavaScript syntax to change the content of the following HTML code.

document.getElement ("letsfindcourse").innerHTML = "I am a letsfindcourse";

document.getElementById ("letsfindcourse").innerHTML = "I am a letsfindcourse";

document.getId ("letsfindcourse") = "I am a letsfindcourse";

document.getElementById ("letsfindcourse").innerHTML = I am a letsfindcourse;

27 / 30

Which operator is known as the strict equality operator, which checks whether its two operators are identical or not?

===

28 / 30

What will be the output if we compare "ten" and 10 with less then comparison operator( "ten" <10)?

undefind

error

29 / 30

JavaScript ignores?

spaces

tabs

newlines

All of the above

30 / 30

Among the keywords below, which one is not a statement?

with

debugger

use strict

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