E-Commerce Development Mobile Commerce 3

Question 1

Which mobile commerce metric measures the percentage of users who add an item to the cart but never complete purchase?

Accepted Answer

Cart abandonment rate

Answer

Cart abandonment rate = (sessions with add-to-cart but no purchase) / (sessions with add-to-cart), expressed as a percentage.

Question 2

What does the viewport meta tag `<meta name='viewport' content='width=device-width, initial-scale=1'>` accomplish?

Accepted Answer

Makes the page width match the device's physical screen width at 1:1 zoom

Answer

This tag prevents mobile browsers from scaling the page down by mapping CSS pixels to device-width at scale 1.

Question 3

Apple Pay and Google Pay use which underlying protocol to transmit encrypted payment tokens to merchants?

Accepted Answer

Tokenization via payment networks (EMVCo)

Answer

Both wallets use EMVCo-standard tokenization, replacing real card numbers with network-specific tokens that are useless if intercepted.

Question 4

A Lighthouse mobile audit reports a Total Blocking Time (TBT) of 350ms. What is the likely cause?

Accepted Answer

Long JavaScript tasks blocking the main thread

Answer

TBT measures time the main thread is blocked by long tasks (>50ms), almost always caused by heavy JavaScript execution.

Question 5

In a React Native mobile commerce app, which component should be used instead of a standard <ScrollView> to efficiently render large product lists?

Accepted Answer

FlatList

Answer

FlatList uses windowing to render only visible items, preventing memory overflow on large datasets.

E-Commerce Development Practice Test