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Students Final Assessment

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1.

An application works on one machine but fails on another due to environment differences. What is the best way to ensure consistent behavior everywhere?

A. Manual setup guides
B. Virtual machines only
C. Containerized environments
D. Hard-coded paths
2.

You need to validate API endpoints automatically after every code change to ensure they still behave correctly. What is the best practice?

D. Logging requests only
B. Unit testing UI components
A. Manual browser testing
C. Automated API tests
3.

You want to reduce the number of database queries made during repeated API requests for the same data. What strategy helps most?

 

 

B. Server-side caching
D. More endpoints
A. Client-side validation
C. Larger payloads
4.

A developer exposes sensitive credentials directly in the frontend bundle, which becomes visible in the browser. What is the correct preventive measure?

 

 

A. Encrypt the JavaScript files
B. Store secrets in environment variables on the server
C. Use stronger passwords
D. Obfuscate the HTML
5.

A developer structures the app so that business logic, data handling, and presentation are clearly separated. What is the main benefit of this approach?

 

B. Easier maintenance and scalability
A. Faster internet speed
C. Smaller file sizes
D. Automatic testing coverage
6.

Your app stores user profiles with varying fields that may change frequently over time. Which data storage approach is most flexible?

 

 

B. Document-oriented storage
D. CSV files
C. Flat files
A. Fixed-schema tables
7.

An API returns different responses based on whether a requested resource exists or not. Which status code should be returned when the resource is missing?

 

 

C. 200
D. 500
B. 201
A. 404
8.

Your API must clearly define how clients should interact with resources using standard conventions. What principle ensures this consistency?

A. Tight coupling
D. UI-driven logic
C. Hard-coded responses
B. Stateless communication
9.

A request updates only one field of an existing resource instead of replacing the entire object. Which HTTP method is most appropriate?

C. PATCH
A. POST
B. PUT
D. DELETE
10.

React Rendering

Your React component re-renders unnecessarily when props don’t change. What should you use?

C. useEffect
A.React.memo
D. useRef
B. useCallback
11.

A deployment pipeline automatically runs tests and blocks releases if any test fails.
What is the primary benefit?

 

A. Faster coding
D. Reduced production errors
B. Smaller repositories
C. Less documentation
12.

 A button on a web page should display a confirmation message only after the user clicks it, without reloading the page. Which approach best achieves this?

 

 

D. HTML form submission
A. Inline CSS styling
B. Server-side rendering
C. Client-side event handling
13.

An endpoint is designed to fetch a list of users. Calling it multiple times with the same request should not change server data. Which HTTP method best fits this behavior?

 

 

D. GET
B. PUT
A. POST
C. PATCH
14.

A user interface updates automatically when underlying data changes, without manually manipulating the DOM. What enables this behavior?

D. Reactive rendering
A. Template literals
B. Two-way data binding
C. Static HTML
15.

In an MVC application, where should business logic reside?

 

 

C. Model
A. View
D. Router
B. Controller
16.

You are building a real-time chat app. Why choose WebSockets over HTTP polling?

C. Better SEO
B. Reduced latency and persistent connection
D. Stronger encryption
A. Easier authentication
17.

You need to create a responsive layout where items wrap automatically based on screen size. Which CSS solution is best?

 

 

B. CSS Grid with fixed columns
C. Flexbox with flex-wrap
A. Float layout
D. Inline-block elements
18.

You want to release breaking API changes without affecting existing clients. What’s the best approach?

 

 

C. Change database schema
B. Remove old endpoints
A.  Version the API (e.g. /v2)
D. Use query parameters
19.

A component re-renders unnecessarily whenever its parent updates, even though its data hasn’t changed. This is causing performance issues.
What is the most appropriate fix?

B. Use memoization to prevent unnecessary renders
A. Move the component to a different file
D. Convert it to a class-based component
C. Replace the component with plain HTML
20.

A landing page looks correct on desktop but breaks on mobile because elements overflow the screen. You need a solution that adapts layouts based on screen size without duplicating markup. What is the best approach?

B. Use fixed pixel widths for all elements
A. Apply media queries with flexible units
C. Load a separate mobile HTML file
D. Increase the viewport width
21.

 A backend service must handle thousands of concurrent requests efficiently without blocking while waiting for database responses. Which design choice best supports this?

 

C. Event-driven, non-blocking execution
A. Synchronous request handling
B. Blocking I/O operations
D. Multi-threading per request
22.

A database must handle complex joins and enforce strict data relationships between tables. Which choice best satisfies this requirement?

 

 

B. Document-based storage
C. Relational schema
A. Key-value storage
D. In-memory cache
23.

Your application state must be shared across multiple deeply nested components without passing props at every level. What is the best solution?

 

 

D. Centralized state management
C. Direct DOM manipulation
A. Global CSS variables
B. Browser localStorage
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