Mobile App Design Mobile App Design 2 — Questions and Answers
Question 1: Which gesture is most commonly used in iOS apps to navigate back to the previous screen?
- Pinch inward
- Swipe right from the left edge (Correct answer)
- Double-tap the screen
- Long-press the back button
Correct answer: Swipe right from the left edge
iOS uses an edge swipe-right gesture to navigate back, consistent with its navigation paradigm.
Question 2: What is the recommended minimum tap target size according to Apple's Human Interface Guidelines?
- 22x22 points
- 44x44 points (Correct answer)
- 64x64 points
- 32x32 points
Correct answer: 44x44 points
Apple recommends a minimum tap target of 44x44 points to ensure reliable touch interaction.
Question 3: In mobile UX, what does 'progressive disclosure' mean?
- Showing all features at once on the home screen
- Revealing information or features only as the user needs them (Correct answer)
- Animating screen transitions progressively
- Loading content in small batches to save bandwidth
Correct answer: Revealing information or features only as the user needs them
Progressive disclosure reduces cognitive load by surfacing advanced options only when relevant to the user's current task.
Question 4: Which color contrast ratio does WCAG 2.1 AA require for normal body text on mobile?
- 2:1
- 3:1
- 4.5:1 (Correct answer)
- 7:1
Correct answer: 4.5:1
WCAG 2.1 AA requires a minimum contrast ratio of 4.5:1 for normal text to ensure readability for users with low vision.
Question 5: What is the primary purpose of a 'skeleton screen' in mobile app design?
- To display error messages when content fails to load
- To show a placeholder layout while real content is loading (Correct answer)
- To outline the wireframe structure for developer handoff
- To render a simplified view for older devices
Correct answer: To show a placeholder layout while real content is loading
Skeleton screens give users a visual preview of the incoming layout, reducing perceived wait time during content loading.
Question 6: When designing a bottom navigation bar for mobile, what is the recommended maximum number of items?
- 3
- 5 (Correct answer)
- 7
- 9
Correct answer: 5
Material Design and Apple HIG both recommend a maximum of 5 items in a bottom navigation bar to avoid overcrowding.
Question 7: Which design principle states that elements that are close together are perceived as a group?
- Similarity
- Continuity
- Proximity (Correct answer)
- Closure
Correct answer: Proximity
The Gestalt principle of proximity holds that objects near each other are perceived as belonging to the same group.
Mobile App Design Mobile App Design 2
Which gesture is most commonly used in iOS apps to navigate back to the previous screen?