Full-Stack Development Development Sample 3

Question 1

What is the main advantage of using environment variables for API keys in a full-stack application?

Accepted Answer

They prevent secrets from being hardcoded in source code

Answer

Environment variables keep secrets out of the codebase and version control, reducing the risk of accidental exposure.

Question 2

In CSS, which property controls the stacking order of overlapping elements?

Accepted Answer

z-index

Answer

z-index determines which element appears on top when elements overlap, with higher values appearing in front.

Question 3

Which of the following best describes 'idempotency' in REST APIs?

Accepted Answer

A request that can be sent multiple times with the same result

Answer

An idempotent operation produces the same server state no matter how many times it is applied with the same input.

Question 4

What does 'lazy loading' mean in the context of a web application?

Accepted Answer

Loading resources only when they are needed

Answer

Lazy loading defers the download of non-critical resources until they are actually required, improving initial page load time.

Question 5

In Git, what command merges a feature branch into the current branch while preserving a linear commit history via replay?

Accepted Answer

git rebase

Answer

git rebase replays commits from one branch on top of another, creating a linear history without a merge commit.

Full-Stack Development Practice Test