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Microsoft Advanced Windows Store App Dev using HTML5 and JavaScript Sample Questions:

1. You are developing a Windows Store app that will access a device's webcam. All necessary device capabilities have been declared in the app manifest.
The app must not throw an error if the user has declined or revoked permission to the webcam.
You need to identify whether the app has permission to use the webcam.
What should you do?

A) Using the CameraCaptureUI class, test for the value returned by the CaptureFileAsync method.
B) Using the MediaCapture class, test for the value returned by the async method.
C) Using the MediaCapture class, test for the value returned by the MediaCaptureSettings property.
D) Using the CameraCaptureUI class, test for the value returned by the videoSettings property.

2. You are developing two Windows Store style apps by using JavaScript. A Source app will store sensitive customer information. A Target app will retrieve the stored information for validation and further processing.
The Source app must secure data by using a private-public key pair. Only the Target app must be able to consume data that has been secured by the Source app.
You need to ensure that the security of the data is not compromised.
What should you do?

A) Encode data to and decode data from a Base64 string.
B) Encrypt data by using an asymmetric algorithm. Decrypt data by using a symmetric algorithm.
C) Encrypt and decrypt data by using a symmetric algorithm.
D) Encrypt and decrypt data by using an asymmetric algorithm.

3. You develop a Windows Store app.
The app user interface is slow to load, and occasionally stops responding.
You need to increase the responsiveness of the user interface.
What should you implement?

A) the Web API of the Windows Library for JavaScript
B) Windows Runtime Metadata (WinMD) components
C) the Await operator
D) promises

4. You need to ensure that drivers can be updated,
What should you do?

A) Create a custom driver to connect files to the app.
B) Connect to the Documents library.
C) Implement the FileOpenPicker control.
D) Implement support for Microsoft DirectDraw Surface files.

5. DRAG DROP
You are developing a Windows Store app by using JavaScript. The app will be used to create video blogs. The app uses the device's internal camera.
The app must meet the following requirements:
Allow the user to record audio and video.
Save files in the .mp4 file format.
Store files in the user's Videos library.
You need to ensure that the app meets the requirements.
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How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

Solutions: