javascript-test-december24

1 / 30

Which of the following is block scoped?

Var

Let

Const

Both b and c

2 / 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

3 / 30

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

Local

Global

semi-global

All of the above

4 / 30

Which symbol is used for comments in Javascript?

* *

* */

5 / 30

Which of the following is not JavaScript Data Types?

Undefined

Number

Boolean

Float

6 / 30

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

Error

1010

7 / 30

Which of the following are the errors in JavaScript?

Load time errors

Run time errors:

Logical Errors:

All of the above

8 / 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;

9 / 30

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

10 / 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

11 / 30

Which company developed JavaScript?

Netscape

Bell Labs

Sun Microsystems

IBM

12 / 30

Which of the following is an array method?

Map

Filter

Reduce

All of these

13 / 30

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

Reverse

Shift

Slice

Splice

14 / 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

15 / 30

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

Keywords

Data types

Declaration statements

Prototypes

16 / 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

17 / 30

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

2varaiblename

_firstvariable

myvariable12

None of the above

18 / 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

19 / 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

20 / 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"

21 / 30

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

isNaN()

nonNaN()

NaN()

None of the above

22 / 30

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

===

23 / 30

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

with

debugger

use strict

24 / 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

25 / 30

How to get a particular value using the tagged name?

getElementbyID()

getElementsbyName()

getElementsbyTagName()

getTagName()

26 / 30

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

undefind

error

27 / 30

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

Letsfindcourse 30

Letsfindcourse30

Exception

28 / 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

29 / 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

30 / 30

JavaScript ignores?

spaces

tabs

newlines

All of the above

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