Mobile App Design UI Design Principles & Visual Hierarchy

Question 1

Which design principle states that elements close to each other are perceived as a group?

Accepted Answer

Proximity

Answer

The Gestalt principle of proximity holds that objects near each other are visually grouped together by users.

Question 2

What is the recommended minimum touch target size for interactive elements in mobile apps according to Apple's Human Interface Guidelines?

Accepted Answer

44x44 pt

Answer

Apple's HIG recommends a minimum touch target of 44x44 points to ensure comfortable and accurate tapping.

Question 3

Which color contrast ratio does WCAG 2.1 AA require for normal text on a mobile interface?

Accepted Answer

4.5:1

Answer

WCAG 2.1 Level AA requires a minimum contrast ratio of 4.5:1 for normal-sized text.

Question 4

In mobile typography, what is the primary purpose of establishing a type scale?

Accepted Answer

To create consistent visual hierarchy across screens

Answer

A type scale creates a harmonious set of font sizes that guide users through content hierarchy consistently.

Question 5

Which layout grid system is most commonly used in mobile app design to maintain consistent spacing?

Accepted Answer

8pt grid system

Answer

The 8pt grid system uses multiples of 8 for spacing and sizing, producing clean layouts across different screen densities.

Mobile App Design Practice Test