GraphQL Quiz ( Beginner ) - All Questions

This easy-level GraphQL quiz is designed for beginners who want to understand GraphQL fundamentals such as queries, schemas, types, and resolvers. It’s perfect for learners starting with GraphQL or preparing for basic frontend and backend interviews.

Question 1: What is GraphQL?

A database
A query language for APIs
A frontend framework
A CSS library

Explanation: GraphQL is a query language for APIs.

Question 2: Who developed GraphQL?

Google
Facebook
Microsoft
Amazon

Explanation: GraphQL was developed by Facebook.

Question 3: What problem does GraphQL mainly solve?

Over-fetching and under-fetching data
UI rendering
Database indexing
State management

Explanation: GraphQL allows clients to request exactly the data they need.

Question 4: Which operation is used to fetch data in GraphQL?

Fetch
Query
Get
Read

Explanation: Queries are used to fetch data.

Question 5: Which operation is used to modify data in GraphQL?

Update
Change
Mutation
Post

Explanation: Mutations are used to modify data.

Question 6: What format does GraphQL typically use for responses?

XML
HTML
JSON
CSV

Explanation: GraphQL responses are returned as JSON.

Question 7: Which component defines available data and operations in GraphQL?

Resolver
Schema
Client
Middleware

Explanation: The schema defines the API structure.

Question 8: What is a resolver in GraphQL?

A database
A function that returns data for a field
A query type
A UI component

Explanation: Resolvers fetch data for fields.

Question 9: Which GraphQL type represents a collection of fields?

Scalar
Object
Enum
Input

Explanation: Object types contain fields.

Question 10: Which of the following is a GraphQL scalar type?

User
Post
String
Profile

Explanation: String is a built-in scalar type.

Question 11: What symbol is used to request fields in GraphQL queries?

()
{}
[]
<>

Explanation: Curly braces define requested fields.

Question 12: What does GraphQL allow clients to control?

Database schema
Server deployment
Shape of the response
Authentication logic

Explanation: Clients specify exactly what data they want.

Question 13: Which operation is optional in a GraphQL API?

Query
Mutation
Subscription
Schema

Explanation: Subscriptions are optional.

Question 14: What are GraphQL subscriptions used for?

Authentication
Real-time updates
Batch queries
Pagination

Explanation: Subscriptions enable real-time data updates.

Question 15: Which HTTP method is commonly used with GraphQL?

GET only
POST only
POST or GET
PUT

Explanation: GraphQL commonly uses POST, sometimes GET.

Question 16: What is introspection in GraphQL?

API authentication
Query optimization
Ability to query the schema
Caching mechanism

Explanation: Introspection allows querying schema details.

Question 17: Which tool is commonly used to test GraphQL APIs?

Postman only
GraphiQL
Swagger UI
Insomnia REST

Explanation: GraphiQL is a popular GraphQL IDE.

Question 18: What does the exclamation mark (!) indicate in GraphQL types?

Optional field
Deprecated field
Non-null field
Array field

Explanation: The ! indicates a non-nullable field.

Question 19: Which GraphQL feature reduces multiple API endpoints?

Resolvers
Single endpoint
Subscriptions
Enums

Explanation: GraphQL uses a single endpoint.

Question 20: What does a GraphQL query return?

Only errors
Only metadata
Requested data
Database schema

Explanation: Queries return requested data.

Question 21: Which keyword defines input data for mutations?

type
input
field
param

Explanation: Input types define mutation inputs.

Question 22: What is an enum in GraphQL?

Dynamic values
Fixed set of values
Object type
Query type

Explanation: Enums define a fixed set of allowed values.

Question 23: Which GraphQL type is used for arguments?

Object
Scalar
Input
Enum

Explanation: Input types are used for arguments.

Question 24: What does GraphQL avoid compared to REST?

Authentication
Multiple endpoints
HTTP requests
JSON responses

Explanation: GraphQL typically uses a single endpoint.

Question 25: Which part of GraphQL handles data fetching logic?

Schema
Client
Resolver
Query

Explanation: Resolvers fetch data.

Question 26: What happens if a field resolver returns null for a non-null field?

Ignored silently
Query fails partially or fully
Value is converted
Server crashes

Explanation: Non-null violations propagate errors.

Question 27: Which GraphQL feature helps explore APIs without documentation?

Resolvers
Introspection
Caching
Batching

Explanation: Introspection enables self-documenting APIs.

Question 28: What does GraphQL client mainly do?

Define schema
Execute database queries
Send queries and handle responses
Deploy servers

Explanation: Clients send queries and handle results.

Question 29: Which company maintains GraphQL specification now?

Facebook
GraphQL Foundation
Google
Microsoft

Explanation: GraphQL is maintained by the GraphQL Foundation.

Question 30: Which GraphQL feature supports strongly typed APIs?

Schema
Resolvers
JSON
HTTP

Explanation: Schema enforces strong typing.

Question 31: Which keyword defines root-level read operations?

Root
Query
Read
Fetch

Explanation: Query defines root read operations.

Question 32: What does GraphQL allow nested queries to do?

Break APIs
Fetch related data in one request
Increase latency
Disable caching

Explanation: Nested queries fetch related data efficiently.

Question 33: Which response field contains errors if any?

data
issues
errors
warnings

Explanation: Errors are returned in the errors field.

Question 34: What does GraphQL not enforce by default?

Schema validation
Authentication
Type safety
Query structure

Explanation: Authentication is handled externally.

Question 35: Which GraphQL feature improves frontend flexibility?

Single endpoint
Client-defined queries
Resolvers
Mutations

Explanation: Clients decide what data they need.

Question 36: What is the role of Apollo Client?

GraphQL server
GraphQL database
GraphQL client library
Schema validator

Explanation: Apollo Client is a GraphQL client library.

Question 37: Which GraphQL server library is popular in Node.js?

Apollo Server
Next.js
Express Router
Axios

Explanation: Apollo Server is widely used.

Question 38: What is the default GraphQL response structure?

Only data
Data and errors
Only errors
Metadata only

Explanation: Responses include data and errors if present.

Question 39: Which GraphQL feature enables versionless APIs?

Deprecation
Schema evolution
Single endpoint
Caching

Explanation: Schema evolution avoids versioning.

Question 40: What does @deprecated directive do?

Removes fields
Marks fields as outdated
Blocks queries
Throws errors

Explanation: It marks fields as deprecated.

Question 41: Which GraphQL operation listens for real-time data?

Query
Mutation
Subscription
Resolver

Explanation: Subscriptions handle real-time updates.

Question 42: What does GraphQL encourage instead of versioning?

Breaking changes
Schema evolution
Multiple endpoints
Client updates

Explanation: GraphQL evolves schemas without versions.

Question 43: Which GraphQL feature improves API discoverability?

Caching
Introspection
Resolvers
Pagination

Explanation: Introspection makes APIs self-documenting.

Question 44: Which type represents true or false values?

Boolean
String
Int
Enum

Explanation: Boolean represents true or false.

Question 45: What is the key advantage of GraphQL over REST?

More endpoints
Exact data fetching
Simpler servers
No authentication

Explanation: GraphQL allows precise data fetching.

Question 46: Which GraphQL concept defines relationships between data?

Resolvers
Fields
Schema types
Queries

Explanation: Schema types define relationships.

Question 47: What must every GraphQL API have?

Mutation type
Subscription type
Query type
Enum type

Explanation: Query type is mandatory.

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GraphQL Quiz ( Beginner )

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