GraphQL

What is a “non-nullable” type in GraphQL? a) A field that must always return a value b) A field that can have any value, including null c) A deprecated field d) A field used for pagination Answer: a) A field that must always return a value Explanation: A non-nullable type in GraphQL ensures that the […]

How can you combine multiple operations into one GraphQL query? a) Using variables b) Using fragments c) Using aliases d) Using unions Answer: c) Using aliases Explanation: In GraphQL, aliases allow you to combine multiple operations in one query by assigning different names to the results, even if the operations use the same fields or

What is the default HTTP method used to send GraphQL queries? a) GET b) POST c) PUT d) DELETE Answer: b) POST Explanation: GraphQL queries are typically sent to the server using the HTTP POST method, though some servers also support GET for certain types of queries. Reference: GraphQL Quiz – MCQ – Multiple Choice

What is “fragments” used for in GraphQL? a) To split large queries into smaller ones b) To reuse sets of fields in multiple queries c) To cache query results d) To paginate results Answer: b) To reuse sets of fields in multiple queries Explanation: Fragments in GraphQL are used to reuse sets of fields in

What does “introspection” mean in GraphQL? a) A way to inspect the schema and its types b) A performance optimization method c) A query to modify the schema d) A method to format responses Answer: a) A way to inspect the schema and its types Explanation: GraphQL introspection allows clients to query information about the

In a GraphQL query, how do you request data from nested objects? a) By creating a separate query for each object b) By sending a POST request c) By specifying fields inside the nested objects in the query d) By using multiple endpoints Answer: c) By specifying fields inside the nested objects in the query

What is “Apollo” in the context of GraphQL? a) A GraphQL schema definition b) A library for building GraphQL APIs and clients c) A front-end framework d) A JavaScript testing tool Answer: b) A library for building GraphQL APIs and clients Explanation: Apollo is a popular library for building GraphQL APIs and clients. It makes

In GraphQL, what does “field resolver” refer to? a) A function that resolves the value for a field b) A tool for debugging queries c) A method to define data types d) A way to format error responses Answer: a) A function that resolves the value for a field Explanation: In GraphQL, a field resolver

Can GraphQL be used for a microservices architecture? a) No, GraphQL is not compatible with microservices b) Yes, it can act as a gateway for multiple microservices c) Only for authentication services d) Only for small applications Answer: b) Yes, it can act as a gateway for multiple microservices Explanation: GraphQL can be used as

In a GraphQL schema, what does the “!” symbol represent? a) The field is required b) The field is an array c) The field has a default value d) The field is deprecated Answer: a) The field is required Explanation: The “!” symbol in a GraphQL schema indicates that the field is non-nullable, meaning the

What is the format of a GraphQL response? a) XML b) JSON c) Plain text d) YAML Answer: b) JSON Explanation: GraphQL responses are returned in JSON format, which includes both the data requested and any errors encountered during execution. Reference: GraphQL Quiz – MCQ – Multiple Choice Questions

How does GraphQL improve over-fetching and under-fetching issues common in REST? a) By sending multiple API requests b) By allowing the client to request only the specific data it needs c) By caching the entire response d) By using SOAP for data fetching Answer: b) By allowing the client to request only the specific data

Can GraphQL be used alongside REST APIs? a) No, they are mutually exclusive b) Yes, GraphQL can be used with REST APIs c) Only in certain cases d) GraphQL must replace REST APIs Answer: b) Yes, GraphQL can be used with REST APIs Explanation: GraphQL can work alongside REST APIs, and many applications use both

In GraphQL, which query allows the client to specify exactly which fields it wants? a) REST query b) Precise query c) Explicit query d) GraphQL query Answer: d) GraphQL query Explanation: In GraphQL, a query allows clients to request exactly the fields they need, making data fetching efficient and flexible. Reference: GraphQL Quiz – MCQ

How does GraphQL handle errors? a) It returns HTTP error codes b) It returns all errors in the “errors” field of the response c) It stops the execution of the query d) It retries the query automatically Answer: b) It returns all errors in the “errors” field of the response Explanation: GraphQL handles errors by

Which of the following is used for real-time communication in GraphQL? a) Queries b) Mutations c) Subscriptions d) Polling Answer: c) Subscriptions Explanation: Subscriptions in GraphQL are used for real-time updates, allowing clients to receive data whenever certain events happen on the server. Reference: GraphQL Quiz – MCQ – Multiple Choice Questions

What is a GraphQL schema? a) A database design diagram b) A type system that defines the structure of data that can be queried c) A front-end framework d) A set of CSS rules Answer: b) A type system that defines the structure of data that can be queried Explanation: A GraphQL schema defines the

Which of the following is a valid GraphQL data type? a) INT b) BOOL c) Float d) StringArray Answer: c) Float Explanation: GraphQL has a set of built-in scalar types, including Float for floating-point numbers, as well as other types like String, Int, and Boolean. Reference: GraphQL Quiz – MCQ – Multiple Choice Questions

What does “mutation” in GraphQL refer to? a) An error handling mechanism b) A type of query to read data c) A way to modify data (create, update, delete) d) A performance improvement technique Answer: c) A way to modify data (create, update, delete) Explanation: Mutations in GraphQL are used to modify data, such as

What does the root type “Query” represent in GraphQL? a) It defines the write operations in GraphQL b) It represents the read operations to fetch data c) It is used for real-time subscriptions d) It handles error responses Answer: b) It represents the read operations to fetch data Explanation: The “Query” root type in GraphQL

What is a key advantage of GraphQL over REST? a) You can only send POST requests b) GraphQL fetches exactly the data you need c) GraphQL requires multiple endpoints d) GraphQL is slower than REST Answer: b) GraphQL fetches exactly the data you need Explanation: One of the main advantages of GraphQL over REST is

In GraphQL, how does the client request data? a) By using RESTful endpoints b) By sending SQL queries c) By sending GraphQL queries to a single endpoint d) By using SOAP protocol Answer: c) By sending GraphQL queries to a single endpoint Explanation: GraphQL allows clients to send queries to a single endpoint, unlike REST,

Which of the following is a feature of GraphQL? a) Strongly typed schema b) Only allows fixed queries c) No support for real-time updates d) GraphQL is only used for front-end development Answer: a) Strongly typed schema Explanation: GraphQL uses a strongly typed schema to define the API’s structure, making it easy to understand what

Who developed GraphQL? a) Google b) Microsoft c) Facebook d) Amazon Answer: c) Facebook Explanation: GraphQL was developed by Facebook in 2012 to improve the performance and flexibility of its mobile applications. Reference: GraphQL Quiz – MCQ – Multiple Choice Questions

What is GraphQL? a) A database management system b) A query language for APIs c) A programming language d) A front-end framework Answer: b) A query language for APIs Explanation: GraphQL is a query language that allows clients to request specific data from APIs, and it executes those queries using a defined type system. Reference: