Question 1

What is the difference between Notify URL and Return URL?

Accepted Answer

Notify URL and Return URL is used in Paypal Payment Gateway integration Notify URL is used by PayPal to post information about the transaction Return URL is used by the browser; A url where the user needs to be redirected on completion of the payment process

Question 2

Difference between clustering and mirroring .

Accepted Answer

- Clustering means one than one database server configured for the same user connection When users connect, one of the server’s responds and connects based on availability The user is completely ignorant of the fact that there are more than one database servers It demands high cost due to infrastructure needs Clustering is hence done on server level - Mirroring means, one has many configured databases on the same server Mirrors are basically copies of the original database Mirroring is hence done on database level

Question 3

What is LINQ ?

Accepted Answer

LINQ stands for " Language Integrated Query " and it is pronounced as "LINK" LINQ was introduced in with NET framework 35 including VS2008 It enables you to query the data from various data source like SQL, XML document, ADO NET data source, web services and any other objects such as Collection, Generics etc

Question 4

What are the advantages of LINQ ?

Accepted Answer

- Debugging is esy - Reduces Development Time - LINQ offers IntelliSense which means writing more accurate queries easily

Question 5

The keyword which indicates that a method can be accessed by only one thread at a time is

Accepted Answer

The synchronized keyword indicates that a method can be accessed by only one thread at a time

Question 6

main() { int i; printf("%d",scanf("%d",&i)); // value 10 is given as input here }

Accepted Answer

Scanf returns number of items successfully read and not 1/0. Here 10 is given as input which should have been scanned successfully. So number of items read is 1.

Question 7

I don't want my class to be inherited by any other class. What should i do?

Accepted Answer

You should declared your class as final But you can't define your class as final, if it is an abstract class A class declared as final can't be extended by any other class

Question 8

What is an error-first callback ?

Accepted Answer

Error-first callbacks are used to pass errors and data as well You have to pass the error as the first parameter, and it has to be checked to see if something went wrong Additional arguments are used to pass data fsreadFile(filePath, function(err, data) { if (err) { // handle the error, the return is important here // so execution stops here return consolelog(err) } // use the data object consolelog(data) })

Question 9

Does not overriding hashcode() method has any performance implication ?

Accepted Answer

A poor Hashcode() function will result in frequent collision in HashMap which eventually increase time for adding an object into Hash Map

Question 10

Which of the following is not a keyword?

Accepted Answer

"eval" is not a keyword and is can be used as variable.

Question 11

Which of the following statements about inheritance is false?

Accepted Answer

Through inheritance, a parent class is a more specialized form of the child class.

Question 12

What is latest iOS version?

Accepted Answer

IOS - 613 (updated on 5/15/13 3:15 AM Pacific Daylight Time)

Question 13

What are the features is IOS 6?

Accepted Answer

1Map beautifully designed from the ground up (and the sky down) 2Integration of Facebook with iOS 3shared photo streams 4Passbook - boarding passes, loyalty cards, retail coupons, cinema tickets and more all in one place 5Facetime - on mobile network as wifi 6changed Phone app - *remind me later, *reply with message 7Mail - redesigned more streamline interface 8Camera with panorama

Question 14

Does iOS support multitasking?

Accepted Answer

IOS 4 and above supports multi-tasking and allows apps to remain in the background until they are launched again or until they are terminated

Question 15

Name the framework that is used to construct application’s user interface for iOS.

Accepted Answer

The UIKit framework is used to develop application’s user interface for iOS UIKit framework provides event handling, drawing model, windows, views, and controls specifically designed for a touch screen interface

Question 16

Who calls the main function of app during the app launch cycle?

Accepted Answer

During app launching, the system creates a main thread for the app and calls the app’s main function on that main thread The Xcode project's default main function hands over control to the UIKit framework, which takes care of initializing the app before it is run

Question 17

What are the three cost factors involves in cloud data center?

Accepted Answer

Cloud data center doesn’t require experts to operate it, but it requires skilled people to see the maintenance, maintain the workloads and to keep the track of the traffic The labor cost is 6% of the total cost to operate the cloud data center Power distribution and cooling of the datacenter cost 20% of the total cost Computing cost is at the end and is the highest as it is where lots of resources and installation has to be done It costs the maximum left percentage

Question 18

What are some open source cloud computing platform databases?

Accepted Answer

Cloud computing platform has various databases that are in support The open source databases that are developed to support it is as follows: - MongoDB: is an open source database system which is schema free and document oriented database It is written in C++ and provides tables and high storage space - CouchDB: is an open source database system based on Apache server and used to store the data efficiently - LucidDB: is the database made in Java/C++ for data warehousing It provides features and functionalities to maintain data warehouse

Question 19

What is the business benefits involved in cloud architecture?

Accepted Answer

1 Zero infrastructure investment : Cloud architecture provide user to build large scale system with full hardware, machines, routers, backup and other components So, it reduces the startup cost of the business 2 Just-in-time Infrastructure : It is very important to scale the infrastructure as the demand rises This can be done by taking cloud architecture and developing the application in the cloud with dynamic capacity management 3 More efficient resource utilization : Cloud architecture provides users to use their hardware and resource more efficiently and utilize it in a better way This can be done only by applications request and relinquish resources only when it is needed (on-demand)

Question 20

What are the different phases involves in cloud architecture?

Accepted Answer

There are four phases that basically gets involved in the cloud architecture: 1 Launch phase: it launches the basic services and makes the system ready for communication and for application building 2 Monitor phase: it monitors the services that is being launched and then manages them so that on demand the user will be able to get what he wants 3 Shutdown phase: it shutdown the services that are not required first and after all the services gets shutdown, and then it closes the system services 4 Cleanup phase: it clean up the left out processes and services that is being either broken or didn’t get shutdown correctly

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