Application Development Questions

Q:

What is the purpose of canvas in HTML?

Answer

Canvas is an element that is used for the graphics for the web page. It uses JavaScript to bring the graphics functionality live. It allows easy way to draw the graphics and use different types of tools to create drawing on the web page. Canvas is just a rectangular area that controls the pixel of every element that is used in the web page. Canvas uses methods like paths, circles, etc. The canvas element will be used as follows:


<canvas id="can" width="200" height="100"></canvas>


The canvas element includes id, width and height settings and with the javascript it gets used like:


<script type="text/javascript">


var c=document.getElementById("can");


var ctx=c.getContext("2d");


ctx.fillStyle="#FF0000";


ctx.fillRect(0,0,150,75);


</script>

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Q:

How does an application run in isolation from other applications?

Answer

Each application gets its own Linux user ID and virtual machine which means that the application code runs in isolation from other applications.

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Q:

When is the best time to kill a foreground activity?

Answer

The foreground activity, being the most important among the other states, is only killed or terminated as a last resort, especially if it is already consuming too much memory. When a memory paging state has been reach by a foreground activity, then it is killed so that the user interface can retain its responsiveness to the user.


 

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Q:

What role does Dalvik play in Android development ?

Answer

Dalvik serves as a virtual machine, and it is where every Android application runs. Through Dalvik, a device is able to execute multiple virtual machines efficiently through better memory management.

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Q:

What are the features added in iOS 9 ?

Answer

  • Intelligent Search and Siri- Intelligent Search is an excellent mechanism to learn user habits and act on that information- open apps before we need them, make recommendations on places we might like and guide us through our daily lives to make sure we’re where we need to be at the right time.
    Siri is a personal assistant to the users, able to create contextual reminders and search through photos and videos in new ways. Swiping right from the home screen also brings up a new screen that houses “Siri Suggestions,” putting favorite contacts and apps right on your fingertips, along with nearby restaurant and location information and important news.

  • Deeper search capabilities can show results like sports scores, videos, and content from third-party apps, and you can even do simple conversions and calculations using the search tools on your iPhone or iPad.

  • Many of the built-in apps have been updated.
    ✓ Notes includes new checklists and sketching features
    ✓ Maps now offers transit directions
    ✓ Mail allows for file attachments
    ✓ Apple Pay is being improved with the addition of store credit cards and loyalty cards
    ✓ Leading “Passbook” to be renamed to “Wallet” in iOS 9.

  • San Francisco font, wireless CarPlay support

  • An optional iCloud Drive app, built-in two-factor authentication and optional longer passwords for better security.

  • Performance improvements

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Q:

What are new Media Elements in HTML5?

Answer

Following are the New Media Elements are present in HTML5:


<audio> tag: for playing audio.


<video> tag: for playing video.


<source> tag: For media resources for media elements.


<embed> tag: For embedded content


<track> tag: For text tracks used in media players

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Q:

Data structure suitable for an application discussed in?

A) procedural design B) architectural design
C) data design D) interface design
 
Answer & Explanation Answer: C) data design

Explanation:
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Q:

The model for a record management system might be

A) a rolodex card file B) a business form
C) handwritten list D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

A Records Management System is a computer program or set of programs used to manage and store records.

 

For example, a hospital record for storing new room, ward , patients, etc...

The_model_for_a_record_management_system_might_be1553926899.png image

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