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React and GraphQL Quiz

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Question 1/15

In GraphQL, what is the purpose of fragments?

Select your answer

To enable reusable units of query logic across operations.

To perform authentication of query operations.

To split queries across multiple HTTP requests.

To handle queries that exceed the character limit.

Question 2/15

What is the main purpose of the Apollo Provider component in a React application?

Select your answer

To apply styles to Apollo Client components.

To connect the Apollo Client to the React component tree.

To initialize a GraphQL server in the app.

To perform static analysis on GraphQL queries.

Question 3/15

How does the useQuery hook in Apollo Client manage data fetching in a React application?

Select your answer

It only fetches data once and never updates.

It automatically fetches and updates data and provides loading and error states.

It handles only mutation operations, not queries.

It requires manual fetching of data when the component is mounted.

Question 4/15

What is the role of resolvers in a GraphQL server?

Select your answer

To manage HTTP requests and response headers.

To provide functions for each field in a type that connect to the data source.

To translate SQL queries into GraphQL queries.

To compile the GraphQL schema.

Question 5/15

In React, what is the purpose of using keys in a list?

Select your answer

To help React identify which items have changed, are added, or removed.

To authenticate users in a list component.

To encrypt component data.

To provide unique IDs for database records.

Question 6/15

What does the term 'optimistic UI update' refer to in the context of Apollo Client?

Select your answer

It refers to updating the user interface immediately, anticipating a successful mutation response.

It refers to waiting for error handling before updating the UI.

It refers to updating UI only after receiving a successful query response.

It refers to performing no change until server-side processing is complete.

Question 7/15

Which hook allows functional components to use state in React?

Select your answer

useState

useEffect

useReducer

useContext

Question 8/15

What is the main benefit of using GraphQL over REST APIs?

Select your answer

Automatic authentication and authorization.

Built-in caching for queries.

Ability to retrieve as much or as little data as needed with a single query.

Support for multiple languages out of the box.

Question 9/15

Which of the following is a benefit of using Apollo Client in a React application?

Select your answer

State management, caching, and easy GraphQL interaction.

Native mobile development support.

HTML DOM manipulation.

Automatic CSS animation rendering.

Question 10/15

In GraphQL, what is a mutation used for?

Select your answer

To perform read operations only.

To perform write operations on data.

To update cache automatically.

To set headers for requests.

Question 11/15

In a typical GraphQL backend, how are queries verified for correctness before execution?

Select your answer

By running a test execution in parallel.

By examining the JSON response caching.

By static analysis based on the schema definition.

By checking against prior execution logs.

Question 12/15

Which of the following is a major limitation of Apollo Client?

Select your answer

Handling subscriptions in real-time data updates.

Managing large-scale state without external libraries.

Running queries in browsers older than IE9.

Integrating with React context API.

Question 13/15

Why is it beneficial to use hooks in React instead of class-based components?

Select your answer

Hooks make React applications slower.

Hooks completely replace HTML in components.

Hooks simplify component logic by allowing functional components to manage state and side effects.

Hooks eliminate the need for CSS in applications.

Question 14/15

Which of the following best describes the purpose of the 'id' field in GraphQL type definitions?

Select your answer

It uniquely identifies each object of a given type and is used for caching.

It defines relationships between different types in the schema.

It restricts access to type fields for security.

It indicates the primary key in the database only.

Question 15/15

What does JSX stand for in a React application?

Select your answer

Java Serialized Execution

JavaScript XHR

JavaScript XML

JavaScript X-ray

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

In GraphQL, what is the purpose of fragments?

Available answers

To enable reusable units of query logic across operations.

To perform authentication of query operations.

To split queries across multiple HTTP requests.

To handle queries that exceed the character limit.

Fragments in GraphQL allow you to reuse query parts in multiple queries to avoid repeating code. They make it easy to ensure consistency and maintainability across similar queries.

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the main purpose of the Apollo Provider component in a React application?

Available answers

To apply styles to Apollo Client components.

To connect the Apollo Client to the React component tree.

To initialize a GraphQL server in the app.

To perform static analysis on GraphQL queries.

The

ApolloProvider

component wraps the entire React application and makes Apollo Client available to all components in the component tree.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

How does the useQuery hook in Apollo Client manage data fetching in a React application?

Available answers

It only fetches data once and never updates.

It automatically fetches and updates data and provides loading and error states.

It handles only mutation operations, not queries.

It requires manual fetching of data when the component is mounted.

The useQuery hook is designed to simplify data fetching in React components. It automatically handles the fetching process, caching, and provides developers with information about the loading and error states.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the role of resolvers in a GraphQL server?

Available answers

To manage HTTP requests and response headers.

To provide functions for each field in a type that connect to the data source.

To translate SQL queries into GraphQL queries.

To compile the GraphQL schema.

Resolvers are responsible for fetching the data for a single field in a type and are essential for fulfilling GraphQL queries.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

In React, what is the purpose of using keys in a list?

Available answers

To help React identify which items have changed, are added, or removed.

To authenticate users in a list component.

To encrypt component data.

To provide unique IDs for database records.

Keys help React identify which items have changed, added, or removed, and are crucial for efficient updating of lists of elements.

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

What does the term 'optimistic UI update' refer to in the context of Apollo Client?

Available answers

It refers to updating the user interface immediately, anticipating a successful mutation response.

It refers to waiting for error handling before updating the UI.

It refers to updating UI only after receiving a successful query response.

It refers to performing no change until server-side processing is complete.

Optimistic UI update allows your app to immediately reflect a change assuming it will succeed. This improves user experience by reducing the latency perceived by delaying UI updates until server responses.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which hook allows functional components to use state in React?

Available answers

useState

useEffect

useReducer

useContext

The

useState

hook lets functional components integrate local component state.

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the main benefit of using GraphQL over REST APIs?

Available answers

Automatic authentication and authorization.

Built-in caching for queries.

Ability to retrieve as much or as little data as needed with a single query.

Support for multiple languages out of the box.

GraphQL allows clients to specify exactly what data they need, reducing over-fetching or under-fetching of data commonly seen in REST APIs. This capability is encapsulated by the query language allowing for more efficient data retrieval.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of the following is a benefit of using Apollo Client in a React application?

Available answers

State management, caching, and easy GraphQL interaction.

Native mobile development support.

HTML DOM manipulation.

Automatic CSS animation rendering.

Apollo Client provides benefits such as efficient state management, caching, and simplifying GraphQL interaction in React applications.

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

In GraphQL, what is a mutation used for?

Available answers

To perform read operations only.

To perform write operations on data.

To update cache automatically.

To set headers for requests.

Mutations in GraphQL are used to modify server-side data, similar to POST, PUT, PATCH, or DELETE operations in REST APIs. They allow clients to create, update, or delete data.

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

In a typical GraphQL backend, how are queries verified for correctness before execution?

Available answers

By running a test execution in parallel.

By examining the JSON response caching.

By static analysis based on the schema definition.

By checking against prior execution logs.

GraphQL queries are statically analyzed for correctness against the schema before execution, which ensures that only valid queries are run.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of the following is a major limitation of Apollo Client?

Available answers

Handling subscriptions in real-time data updates.

Managing large-scale state without external libraries.

Running queries in browsers older than IE9.

Integrating with React context API.

Apollo Client can struggle with managing large-scale application state without mixing in other state management solutions like Redux.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

Why is it beneficial to use hooks in React instead of class-based components?

Available answers

Hooks make React applications slower.

Hooks completely replace HTML in components.

Hooks simplify component logic by allowing functional components to manage state and side effects.

Hooks eliminate the need for CSS in applications.

Hooks provide a more direct API to the concepts React developers are already familiar with like state and lifecycle. They simplify sharing logic among components through custom hooks, and they make complex components look simpler and cleaner.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of the following best describes the purpose of the 'id' field in GraphQL type definitions?

Available answers

It uniquely identifies each object of a given type and is used for caching.

It defines relationships between different types in the schema.

It restricts access to type fields for security.

It indicates the primary key in the database only.

The 'id' field in GraphQL type definitions serves as a unique identifier for objects, assisting with the optimization of client-side caching mechanisms.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

What does JSX stand for in a React application?

Available answers

Java Serialized Execution

JavaScript XHR

JavaScript XML

JavaScript X-ray

JSX stands for JavaScript XML. It is a syntax extension for JavaScript used in React to describe what the UI should look like.