Basic And Variables — Part 2 MCQs with Explanations

use strict is a directive introduced in ECMAScript5. Directives are not statements because it does not include any language keywords. Also, it can appear only at the start of a script or at the start of a function body, before any real statemenst have appeared.

An object is an unordered collection of properties, each of which has a name and a value. Property names are strings, so we can say that objects map strings to values.

Every object has three associated object attributes : 1. An object’s prototype is a reference to another object from which properties are inherited. 2. An object’s class is a string that caegorizes the type of an object. 3. An object’s extensible flag specifies whether new properties may be added to the object.

firstname and surname are the property names. The value of that particular property is itself an object. That is why these property names are unquoted.

Consider an example, Date.prototype inherits properties from Object.prototype, so a Date object created by new Date() inherits properties from both Date.prototype and Object.prototype. This linked series of prototype objects is known as prototype chain.

When using square bracket notation, the expression inside the square brackets must evaluate to a sting or a value that can be converted to a string.

To determine whether one object is the prototype of (or is part of the prototype chain of) another object, one should use the isPrototype() method. To find out if p is the prototype of o write p.isPrototypeOf(o).

The above code snippet defines a custom constructor.

The purpose of the extensible attribute is to be able to “lock down” objects into a known state and prevent outside tampering.

Object serialization is the process of converting an object’s state to a string from which it can later be restored.

will work perfectly well on a Windows Machine is the correct answer to “A JavaScript program developed on a Unix Machine”. This question is standard in competitive examination syllabi for Basic And Variables.

Function/Method is the correct answer to “JavaScript Code can be called by using”. This question is standard in competitive examination syllabi for Basic And Variables.

High level programming language is the correct answer to “A proper scripting language is a”. This question is standard in competitive examination syllabi for Basic And Variables.

123123 is the correct answer to “Consider the following snippet code var string1 = ” 123 ”; var intvalue = 123 ; alert ( string1 + intvalue ) ; The result would be”. This question is standard in competitive examination syllabi for Basic And Variables.

The value of count from 0 to 9 is displayed in the console is the correct answer to “Consider the following statements var count = 0 ; while ( count < 10 ) { console . log ( count ) ; count ++ ; } In the above code snippet, what happens”. This question is standard in competitive examination syllabi for Basic And Variables.

If the object inherits enumerable properties is the correct answer to “The enumeration order becomes implementation dependent and non-interoperable if :”. This question is standard in competitive examination syllabi for Basic And Variables.

return a localized string representation of the object is the correct answer to “The basic purpose of the toLocaleString() is to”. This question is standard in competitive examination syllabi for Basic And Variables.

Scripting is the correct answer to “Javascript is _________ language.”. This question is standard in competitive examination syllabi for Basic And Variables.

Browser is the correct answer to “JavaScript is ______ Side Scripting Language.”. This question is standard in competitive examination syllabi for Basic And Variables.

To add interactivity to HTML Pages. is the correct answer to “JavaScript is designed for following purpose”. This question is standard in competitive examination syllabi for Basic And Variables.

.js is the correct answer to “JavaScript Code is written inside file having extension __________.”. This question is standard in competitive examination syllabi for Basic And Variables.

JS is the correct answer to “Local Browser used for validations on the Web Pages uses __________.”. This question is standard in competitive examination syllabi for Basic And Variables.

True is the correct answer to “We can embed JS code inside HTML directly”. This question is standard in competitive examination syllabi for Basic And Variables.

True is the correct answer to “JS code included inside head section is loaded before loading page.”. This question is standard in competitive examination syllabi for Basic And Variables.

True is the correct answer to “It is good to include JS code inside footer section in order to speed up the Page loading time of Webpage.”. This question is standard in competitive examination syllabi for Basic And Variables.

defer is the correct answer to “Which attribute is used to specifies that the script is executed when the page has finished parsing (only for external scripts)”. This question is standard in competitive examination syllabi for Basic And Variables.

Netscape is the correct answer to “Which was the first browser to support JavaScript”. This question is standard in competitive examination syllabi for Basic And Variables.

Brendan Eich is the correct answer to “JavaScript is invented by ________.”. This question is standard in competitive examination syllabi for Basic And Variables.

Netscape is the correct answer to “JavaScript was invented at _______ Lab.”. This question is standard in competitive examination syllabi for Basic And Variables.

Single is the correct answer to “Variable can hold ________ value at a time.”. This question is standard in competitive examination syllabi for Basic And Variables.

var num is the correct answer to “Integer Variable is declared using following syntax in JavaScript.”. This question is standard in competitive examination syllabi for Basic And Variables.

One or more Variables is the correct answer to “We can declare ___________ at a time. Select most appropriate option.”. This question is standard in competitive examination syllabi for Basic And Variables.

Special is the correct answer to “Spaces,Punctuation marks are called as __________ Symbols in JavaScript.”. This question is standard in competitive examination syllabi for Basic And Variables.

Sensitive is the correct answer to “Java Script Variable should be Case ___________.”. This question is standard in competitive examination syllabi for Basic And Variables.

= is the correct answer to “Initialization of variable can be done by writing _____ operator in between variable name and operand value.”. This question is standard in competitive examination syllabi for Basic And Variables.

Comma is the correct answer to “Multiple Declarations of variables are separated by ___________ symbol.”. This question is standard in competitive examination syllabi for Basic And Variables.

True is the correct answer to “Underscore can be used as first letter while declaring variable in JavaScript.”. This question is standard in competitive examination syllabi for Basic And Variables.

Local Variables is the correct answer to “Variable declared inside JavaScript Function will be called as ____________.”. This question is standard in competitive examination syllabi for Basic And Variables.

True is the correct answer to “Local Variables are destroyed after execution of function.”. This question is standard in competitive examination syllabi for Basic And Variables.