Mobile App Design Technology & Digital Applications 3

Question 1

Which rendering approach draws UI components directly on a canvas, bypassing native OS widgets, as used by Flutter?

Accepted Answer

Custom/canvas rendering

Answer

Flutter uses its own Skia/Impeller rendering engine to draw all UI widgets to a canvas, ensuring pixel-perfect consistency across platforms.

Question 2

In RESTful API design for mobile, what HTTP status code indicates a successfully created resource?

Accepted Answer

201 Created

Answer

HTTP 201 Created is the correct response when a POST request successfully creates a new resource on the server.

Question 3

What is 'token refresh' used for in mobile OAuth 2.0 authentication flows?

Accepted Answer

Obtaining a new access token without requiring the user to log in again

Answer

A refresh token allows the app to silently obtain a new short-lived access token when the current one expires, maintaining session continuity.

Question 4

Which mobile performance metric measures the time from user interaction to the next frame being painted?

Accepted Answer

Input latency / touch response time

Answer

Input latency measures how quickly the app visually responds to user touches or gestures, with targets typically under 100ms for a smooth feel.

Question 5

What distinguishes a progressive web app (PWA) from a native mobile app?

Accepted Answer

PWAs run in a browser engine and can be installed without an app store

Answer

PWAs use web technologies and run via the browser engine; they can be added to the home screen but have more limited hardware access than native apps.

Mobile App Design Practice Test

Mobile App Design Practice Test

Mobile App Design Technology & Digital Applications 3