What is ARC ?

Correct Answer: ARC is a compiler-level feature that simplifies the process of managing the lifetimes of Objective-C objects Instead of you having to remember when to retain or release an object, ARC evaluates the lifetime requirements of your objects and automatically inserts the appropriate method calls at compile time

Correct Answer: IOS development requires Intel-based Macintosh computer and iOS SDK

Correct Answer: An app can get into InActive state when the user locks the screen or the system prompts the user to respond to some event eg SMS message, incoming call etc

Correct Answer: Cocoa is for Mac App development and cocoa touch is for apples touch devices - that provide all development environment

Correct Answer: ello

Explanation:

deleteCharAt() method deletes the character at the specified index location and returns the resulting StringBuffer object.

So after deleting the character at 0 ie 'H', the string returns 'ello' as the output.

Correct Answer: The security laws which are implements to secure data in the cloud are as follows: - Input validation : controls the input data which is being to any system - Processing : control that the data is being processed correctly and completely in an application - File : control the data being manipulated in any type of file - Output reconciliation : control the data that has to be reconciled from input to output - Backup and recovery: control the security breaches logs and the problems which has occurred while creating the back

Correct Answer: In a mapreduce job the master pings each worker periodically In case a worker does not respond to that system then the system is marked as failed Even completed tasks are rescheduled because the output was stored in a in a local disk of a worker which failed Hence mapreduce is able to handle large-scale failures easily by simply restarting a task The master node always saves itself at checkpoints and in case of any failure it simply restarts from that checkpoint

Correct Answer: SELECT YEAR(GETDATE()) as "Year";

Correct Answer: There are many ways to find second highest salary of Employee in SQL, you can either use SQL Join or Subquery to solve this problem Here is SQL query using Subquery : SELECT MAX(Salary) from Employee WHERE Salary NOT IN (select MAX(Salary) FROM Employee );

Correct Answer: Combines the output from multiple queries and must include the same number of columns.

Explanation:

A UNION query combines the output from multiple queries and must include the same number of columns.