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Developer Expert Exam
Question 1. In Magento 2, what is the primary purpose of Dependency Injection (DI)? A) To instantiate classes directly within the code B) To promote loose coupling and improve testability C) To replace the Object Manager entirely D) To hardcode dependencies for better performance Answer: B Explanation: Dependency Injection in Magento 2 promotes loose coupling by injecting dependencies through constructors, which enhances testability and maintainability of code. Question 2. What is the role of a plugin (interceptor) in Magento 2? A) To override core classes permanently
Developer Expert Exam
B) To extend or modify core functionality dynamically C) To replace core classes during runtime D) To manage database schema changes Answer: B Explanation: Plugins (interceptors) allow developers to extend or modify existing methods without rewriting core classes, providing a flexible way to customize behavior. Question 3. Which plugin type executes code before the original method is called? A) after B) around C) before
Developer Expert Exam
Explanation: Preferences should be used cautiously, typically as a last resort, because they override entire class implementations and can make code harder to maintain. Question 5. What is the main purpose of service contracts in Magento 2? A) To enforce strict type checking B) To provide a stable API and promote loose coupling C) To manage database transactions D) To handle frontend rendering Answer: B Explanation: Service contracts define APIs via interfaces, ensuring stability and loose coupling between modules and external integrations.
Developer Expert Exam
Question 6. How do factories in Magento 2 assist in object creation? A) They generate singleton instances B) They create complex objects with dependencies dynamically C) They replace class constructors D) They store configuration settings Answer: B Explanation: Factories generate instances of classes, especially complex ones with dependencies, at runtime, following Magento's code generation practices. Question 7. Which file is used to register a Magento 2 module? A) module.xml B) registration.php
Developer Expert Exam
Explanation: module.xml declares the module's name and dependencies, as well as version information, which Magento uses to manage module loading order. Question 9. How does Composer help manage Magento modules? A) It handles module dependencies and versioning B) It replaces the need for registration.php C) It manages database upgrades D) It compiles PHP templates Answer: A Explanation: Composer manages dependencies, versions, and updates of Magento modules, ensuring compatibility and proper integration.
Developer Expert Exam
Question 10. Which layout XML file is typically used for product view pages? A) default.xml B) catalog_product_view.xml C) page.xml D) layout.xml Answer: B Explanation: catalog_product_view.xml is the layout XML file specific to product detail pages, used to add or modify blocks on product views. Question 11. How do view models differ from block classes in Magento 2? A) View models are used only for frontend, blocks only for admin B) View models are designed for better testability and separation of concerns
Developer Expert Exam
Explanation: .phtml templates contain PHP code that outputs HTML content, rendering the frontend or admin UI. Question 13. Which function should be used within templates to escape HTML output for security? A) htmlspecialchars() B) escapeHtml() C) strip_tags() D) htmlentities() Answer: B Explanation: escapeHtml() is a Magento-provided method to escape output for HTML, preventing XSS vulnerabilities.
Developer Expert Exam
Question 14. How does RequireJS facilitate frontend module loading in Magento 2? A) It synchronously loads JavaScript files B) It manages dependencies and asynchronously loads modules C) It compiles LESS files D) It handles PHP code execution Answer: B Explanation: RequireJS manages asynchronous loading of JavaScript modules, resolving dependencies efficiently for better performance. Question 15. In Knockout.js, what is an observable used for? A) To hold static data B) To automatically update UI when data changes
Developer Expert Exam
Explanation: Customizing themes typically involves using LESS preprocessor features like mixins and leveraging the theme inheritance hierarchy. Question 17. What is EAV in Magento, and when is it used? A) Entity-Attribute-Value; used for flexible product and customer attributes B) Extended Attribute Vector; used for custom data storage C) Embedded Application View; used for rendering admin UI D) External Access Variable; used for API security Answer: A Explanation: EAV allows dynamic and flexible attribute management for entities like products and customers, enabling custom attribute addition without altering schemas.
Developer Expert Exam
Question 18. When should you use a flat table instead of EAV? A) When high read performance is required for large datasets B) When storing only static data C) When data is highly dynamic D) When using complex relationships Answer: A Explanation: Flat tables provide faster read performance for large, static datasets, whereas EAV offers flexibility at the cost of complexity. Question 19. What is the purpose of resource models in Magento 2 ORM? A) To define how data is loaded, saved, and deleted from the database B) To generate frontend UI components
Developer Expert Exam
Explanation: Collections allow efficient retrieval and manipulation of multiple entities with filtering, sorting, and joining capabilities. Question 21. What is declarative schema in Magento 2? A) XML-based schema definition for database tables B) PHP scripts for database upgrades C) JSON configuration for modules D) A deprecated method of schema management Answer: A Explanation: Declarative schema uses XML files (db_schema.xml) to define database structures, enabling automatic schema creation and updates. Question 22. Why are schema patches preferred over legacy upgrade scripts?
Developer Expert Exam
A) They are more flexible and easier to maintain B) They replace data patches C) They are written in PHP D) They require less testing Answer: A Explanation: Schema patches offer a more modular, declarative approach to schema modifications, simplifying upgrades and reducing errors. Question 23. What is the main function of data patches in Magento 2? A) To modify data, such as creating CMS pages or updating attributes B) To define database schema C) To register modules
Developer Expert Exam
Explanation: The execute() method contains the code to perform data modifications within a data patch class. Question 25. What is the difference between UpgradeSchema and Schema Patch? A) UpgradeSchema is procedural PHP code; Schema Patch is XML-based B) UpgradeSchema is deprecated; Schema Patch is declarative C) They are identical D) UpgradeSchema manages data; Schema Patch manages schema Answer: B Explanation: UpgradeSchema scripts are procedural and deprecated in favor of declarative schema and schema patches for schema management.
Developer Expert Exam
Question 26. How are Magento modules identified internally? A) By a unique namespace and module name in registration.php B) Using composer.json only C) By class names D) Through layout XML files Answer: A Explanation: Modules are identified by their namespace and name specified in registration.php, ensuring uniqueness within Magento. Question 27. Which XML file defines dependencies between modules? A) module.xml B) di.xml
