Interview Questions

Q:

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

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.

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Subject: Cloud Computing

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Q:

What is IUnknown and what are its three parts?

Answer

IUnknown as an interface of a COM object. Every COM object has to support IUnknown, besides optionally adding other interfaces.


IUnknown is made of QueryInterface, AddRef and Release.

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Q:

What is Thread?

Answer

A Thread is a block of code that can be executed in parallel with another block of code.

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Subject: Java

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Q:

What is android? What are the features of Android?

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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Q:

If the variable $a is equal to 5 and variable $b is equal to character a, what’s the value of $$b?

Answer 100, it’s a reference to existing variable.
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Subject: PHP

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Q:

How do you insert a record with a nullable column?

Answer

To insert a NULL, move -1 to the null indicator


To insert a valid value, move 0 to the null indicator


 

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Q:

What documents are used for use cases?

Answer

There are 2 documents: 


FRD (functional requirement document) 


SDD (system design document) which can also be called TRS (Technical requirements specifications) 

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Q:

How to upload files in Amazon S3?

Answer

Amazon S3 provides uploading of large files and retrieve small offsets for end-to-end transfer data rates. The large file gets stored into small files that are smaller in size. Amazon S3 stores multiple of files together in a bundle or in a compressed form, For example in .gzip or .gz format and then convert them into Amazon S3 objects. The files get uploaded on the Amazon server by the use of FTP or another protocol and then retrieved through the HTTP GET request. The request includes the defined parameters like URL, offset (byte-range) and size (length).

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Subject: Cloud Computing

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