Question 1

List the major benefits of E-commerce.

Accepted Answer

The major benefits of Ecommerce are: - Secure : More secure than a cheque - Fast : The transactions take not more than a few seconds - Always on : The purchases can be made 24/7 - Convenient: Ease of purchasing -Reduced cost price : Reduction of Marketing and Advertising Costs

Question 2

Distinguish between Static vs. Dynamic HTML

Accepted Answer

- The easiest difference is static HTML once rendered cannot be changed on the other hand dynamic HTML can be changed - Static web pages cannot have database access but dynamic pages can be connected to database - Using static HTML no interactions persist between user and server but dynamic HTML has capability to interact with the user - Static HTML does not require server side coding but dynamic HTML requires server side coding - No animation, games can be developed using the static HTML but on the other hand dynamic HTML can perform this task

Question 3

Explain three important components of Dynamic HTML authoring - Positioning, Style modifications and Event handling

Accepted Answer

- Positioning: Is some what where we need the object to be placed in the graphical view i:e on screen If we talk in DHTML sense then we have two types of positioning: Relative and Absolute Relative Positioning: Relative positioning is the same as the current HTML3 layout and is best reserved for situations where you want to be sure that the content will revert to this default inside a document that also uses absolute positioning Absolute Positioning: In DHTML absolute positioning means that the object will remain at the same position regardless of the condition of other elements and the size of the browser In simple languages if an object/image is absolutely positioned (STYLE="position: absolute;"), with an offset of 150 pixels to the right and 250 pixels down from the left-hand corner of the browser screen then it will avail this position what ever the circumstances may be - Style Modifications: Style modification indicates the changes in the presentation or the view part that are being made in web page This part comes under Cascading Style Sheet where the user style his web page by using the attributes and the tags that are pre-defined in CSS - Event Handling: As explained earlier Events is the beating heart of any JavaScript application For handling event in DHTML we attach event handler to HTML elements The event handler waits until a certain event, for instance a click on a link, takes place When it happens it handles the event by executing some JavaScript code that has been defined by us After it has executed the code the event handler comes to its initial state and waits for the user to fire any event Hence to handle events in DHTML we need to register an event handler

Question 4

Explain about struts dispatch action in DHTML

Accepted Answer

DispatchAction is an action that comes with Struts 11 or later, that let us combine Struts actions into single class, each with their own method The orgapachestrutsactionDispatchAction class allows multiple operations to map to the different functions in the same Action class For e:g; html:hidden property="dispatch" value="error"/>

Question 5

What is a Node.js?

Accepted Answer

Nodejs is a framework for web applications built on Google Chrome's JavaScript Engine(V8 Engine) Nodejs is comes with runtime environment on which a cript based on javascript can be interpreted and executed (It is analogus to JVM to JAVA byte code) This runtime environment allows to execute a JavaScript code on any machine outside a browser Because of this runtime of Nodejs, JavaScript is now can be executed on server also Nodejs is provides a rich library of various javascript modules which eases the developement of web application using Nodejs to greater extents

Question 6

What are the Advantages of Node.js?

Accepted Answer

Aynchronous and Event Driven - All APIs of Nodejs library area unit aynchronous that's non-blocking It basically means that a Nodejs based mostly server not waits for a API to return information Server moves to next API when calling it and a notification mechanism of Events of Nodejs helps server to induce response from the previous API decision Very Fast - Nodejs library is very fast in execution of code Single Threaded but highly Scalable - Nodejs uses a single threaded model with event looping Nodejs uses a single threaded program and same program can services much larger number of requests than traditional server like open source No Buffering - Nodejs applications never buffer any data These applications simply output the data in faster

Question 7

Is Node.js is a single threaded application?

Accepted Answer

Nodejs uses a single threaded model with event looping

Question 8

What is a REPL in context of Node.js?

Accepted Answer

Read - Reads users input, parse the input into JavaScript data-structure and stores in memory Eval - Evaluates the data structure Print - Prints the result Loop - Loops the above command until user press ctrl-c twice

Question 9

How does Node.js prevents blocking code?

Accepted Answer

By providing callback function Callback function gets called whenever corresponding event triggered

Question 10

What is the purpose of Buffer class in Node.js?

Accepted Answer

Buffer class could be a global class and may be accessed in application without importing buffer module A Buffercould be a quite an array of integers and corresponds to a raw memory allocation outside the V8 heap A Buffer can not be resized

Question 11

What is a AngularJS?

Accepted Answer

AngularJS is a framework to build the large scale and high performance web application while keeping them as easy-to-maintain These are the features of AngularJS framework AngularJS is a powerful Script based on JavaScript development framework to Implement RICH Internet Application (RIA) AngularJS is a developers options to write client side application (using JavaScript) in a clean MVC (Model View Controller) side Application are written in AngularJS is also cross-browser compliant AngularJS automatically handles JavaScript code suitable for any browser AngularJS is an open source, completely free, and used by large number of developers around the world It is licensed under the Apache License version 20

Question 12

What is templates in AngularJS?

Accepted Answer

Templates are the rendered view with information from the controller and model These can be a single file like indexhtml or multiple views in one page using "partials"

Question 13

Explain about AngularJS boot process.

Accepted Answer

When the page is loaded in the browser, following action takes place: HTML document is loaded into the browser, and evaluated by the browser AngularJS JavaScript file is loaded; the angular global object is created Next, JavaScript which registers controller functions is executed AngularJS scans through the HTML to look for AngularJS applications and views Once view is located, it then connects that view to the corresponding controller function Then, AngularJS executes the controller functions It then renders the views with data from the model populated by the controller The page is ready

Question 14

What is the Advantage of AngularJS?

Accepted Answer

These are the advantages of AngularJS: AngularJS provides capability to form Single Page Application in a very clean and maintainable method AngularJS provides data binding capability to HTML therefore giving user a rich and responsive experience AngularJS code is unit testable AngularJS uses dependency injection and build use of separation of concerns AngularJS provides reusable components AngularJS helps developer to writes less code and gets more functionality AngularJS, views are pure HTML pages, and controllers written in JavaScript do the business process AngularJS applications will run on all major browsers and good phones together with android and iOS based mostly phones/tablets

Question 15

JavaScript is designed for following purpose

Accepted Answer

To add interactivity to HTML Pages.

Question 16

Website always has

Accepted Answer

Address

Question 17

HTML language is a set of markup

Accepted Answer

HTML language is a set of markup tags. The code used to specify the formatting are called tags. Markup languages are designed for the processing, definition and presentation of text. The language specifies code for formatting, both the layout and style, within a text file. HTML is an example of a markup language to improve the appearance of, and link text with data on the internet.

Question 18

Describe Android Application Architecture.

Accepted Answer

Android Application Architecture has the following components: * Services – like Network Operation * Intent - To perform inter-communication between activities or services * Resource Externalization - such as strings and graphics * Notification signaling users - light, sound, icon, notification, dialog etc * Content Providers - They share data between applications

Question 19

What is needed to make a multiple choice list with a custom view for each row?

Accepted Answer

Multiple choice list can be viewed by making the CheckBox android:id value be “@android:id /text1" That is the ID used by Android for the CheckedTextView in simple_list_item_multiple_choice

Question 20

What is android? What are the features of Android?

Accepted Answer

Android is a stack of software for mobile devices which has Operating System, middleware and some key applications The application executes within its own process and its own instance of Dalvik Virtual Machine Many Virtual Machines run efficiently by a DVM device DVM executes Java language’s byte code which later transforms into dex format files Features of Android : - Components can be reused and replaced by the application framework - Optimized DVM for mobile devices - SQLite enables to store the data in a structured manner - Supports GSM telephone and Bluetooth, WiFi, 3G and EDGE technologies - The development is a combination of a device emulator, debugging tools, memory profiling and plug-in for Eclipse IDE

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