Ethereum Application Programming Interfaces Quiz

1. What is an Ethereum API?

• An Ethereum API is a security tool used to protect Ethereum wallets from unauthorized access.
• An Ethereum API is an application programming interface that allows developers to interact with the Ethereum blockchain to build decentralized applications (dApps).
• An Ethereum API is a software that compiles Ethereum contracts directly into binary format.
• An Ethereum API is a graphical user interface designed for Ethereum blockchain visualization.

2. What are the primary functions of Ethereum APIs?

• Ethereum APIs are used primarily for managing network nodes and monitoring traffic.
• Ethereum APIs focus on developing private networks and providing permissioned access to applications.
• Ethereum APIs are mainly designed to handle user interface interactions and data visualization.
• Ethereum APIs serve as gateways for interacting with the Ethereum blockchain by reading data, sending transactions, and executing smart contracts.

3. Which Ethereum API is most commonly used for dApp development?

• Ether.js
• Blockchain API
• Solidity API
• Web3 API

4. What does the Web3 API allow developers to do?

• The Web3 API allows developers to interact with the Ethereum blockchain through JSON-RPC calls for reading data and pushing transactions.
• The Web3 API allows developers to build centralized applications without blockchain integration.
• The Web3 API allows developers to directly mine Ethereum coins and validate network transactions.
• The Web3 API allows developers to create new cryptocurrencies and manage user wallets.

5. How do Web3 APIs connect to Ethereum nodes?

• Web3 APIs connect to local or remote Ethereum nodes on the peer-to-peer network using the HTTP protocol.
• Web3 APIs link to Ethereum nodes using Bluetooth technology.
• Web3 APIs communicate with Ethereum nodes via email notifications.
• Web3 APIs interact through file transfers over FTP.

6. What is JSON-RPC in the context of Ethereum APIs?

• JSON-RPC is a remote procedure call protocol for Ethereum interactions.
• JSON-RPC is a blockchain protocol for creating dApps.
• JSON-RPC is a programming language used for Ethereum contracts.
• JSON-RPC is an encryption method for Ethereum transactions.

7. What are the two major types of Ethereum APIs?

• Web3 API and Management API
• REST API and GraphQL API
• SOAP API and XML-RPC API
• gRPC API and RPC API

8. What is the purpose of the Management API?

• The Management API is for creating user interfaces for dApps.
• The Management API is not relevant to Ethereum blockchain interaction.
• The Management API is used to execute smart contracts and read data.
• The Management API is used for managing nodes and the overall network.

9. What does the Web3.js library provide?

• Complex encryption methods for transactions
• Advanced graphic interfaces for dApp design
• Easy abstractions for blockchain communication
• Direct control over Ethereum nodes and servers

10. What methods can be used with the Web3 API?

• Methods like `eth_exportKey`, `eth_importWallet`, and `eth_rescaleTransaction`
• Methods like `eth_createWallet`, `eth_upgradeContract`, and `eth_deleteAccount`
• Methods like `eth_compileContract`, `eth_debugTransaction`, and `eth_runNode`
• Methods like `eth_getBalance`, `eth_sendTransaction`, and `eth_call`

11. How do Ethereum APIs handle blockchain connectivity tasks?

• Ethereum APIs strictly deal with database management and data entries.
• Ethereum APIs only manage user account setups and transactions.
• Ethereum APIs facilitate social media connectivity and user engagement.
• Ethereum APIs handle transaction nonce management, gas cost handling, and private key signing.

12. What is the role of Ethereum nodes in the context of APIs?

• Ethereum nodes serve as design templates for building user interfaces in applications.
• Ethereum nodes validate transactions and maintain a distributed ledger, facilitating seamless interaction with these nodes through APIs.
• Ethereum nodes create new programming languages for dApps and APIs.
• Ethereum nodes collect user data and share it with third parties for marketing.

13. What is the benefit of using Ethereum APIs for developers?

• It requires developers to write complex blockchain protocols.
• It guarantees automatic transaction success without errors.
• It abstracts away low-level details, allowing developers to focus on dApp design.
• It provides developers with a built-in wallet for transactions.

14. What is the primary benefit of using Web3 APIs for dApp development?

• Web3 APIs simplify blockchain integration.
• Web3 APIs increase transaction fees.
• Web3 APIs eliminate the need for coding.
• Web3 APIs reduce network security risks.

15. How do Ethereum APIs ensure security in decentralized applications?

• Ethereum APIs ensure security by storing user data on centralized servers to prevent theft.
• Ethereum APIs ensure security by requiring daily server reboots to safeguard against malware.
• Ethereum APIs ensure security by using complex quantum algorithms to encrypt all data transactions.
• Ethereum APIs ensure security by handling cryptographic signing and node communication, providing a secure interface for interacting with the blockchain.

16. What is the significance of gas in Ethereum transactions?

• Gas is a storage fee charged for holding Ether in wallets.
• Gas is a measure of the speed of Ethereum network transactions.
• Gas is the type of cryptocurrency used for trading on Ethereum exchanges.
• Gas is an internal pricing mechanism used by the Ethereum Virtual Machine (EVM) to execute scripts and handle transactions.

17. What is the Ethereum Virtual Machine (EVM)?

• A decentralized virtual machine that executes scripts
• A specific cryptocurrency wallet interface
• A centralized database for transactions
• A network of private servers for data storage

18. How do Ethereum APIs facilitate efficient blockchain development?

• Ethereum APIs focus solely on managing Ethereum network hardware rather than software development.
• Ethereum APIs serve as direct connections to user wallets, allowing automatic fund transfers without programming.
• Ethereum APIs offer advanced data storage solutions that eliminate the need for blockchain technology.
• Ethereum APIs provide a standardized interface for developers to interact with the Ethereum blockchain, mitigating coding complexities and accelerating the development lifecycle.

19. What programming language is commonly used to write smart contracts on Ethereum?

• C++
• Java
• Python
• Solidity

20. What is the purpose of the `eth_call` method in Web3.js?

• The `eth_call` method in Web3.js retrieves the current block number only.
• The `eth_call` method in Web3.js is used for managing Ethereum nodes directly.
• The `eth_call` method in Web3.js executes smart contract functions without sending a transaction.
• The `eth_call` method in Web3.js sends a transaction to alter blockchain state.

21. How do developers interact with Ethereum nodes using Web3 APIs?

• Developers send email requests to Ethereum nodes for transaction handling and data retrieval.
• Developers interact with Ethereum nodes using Web3 APIs by making JSON-RPC requests through libraries like Web3.js.
• Developers communicate with Ethereum nodes via direct TCP connections without the need for APIs.
• Developers use traditional HTTP forms to manage interactions with Ethereum nodes directly.

22. What is the role of the `eth_sendTransaction` method in Web3.js?

• The `eth_sendTransaction` method retrieves the current block number of the Ethereum blockchain.
• The `eth_sendTransaction` method is used to check the balance of an Ethereum account.
• The `eth_sendTransaction` method estimates the gas required for a transaction.
• The `eth_sendTransaction` method sends transactions from one Ethereum address to another.

23. What is the significance of the `eth_getBalance` method in Web3.js?

• The `eth_getBalance` method retrieves the transaction history of an Ethereum account.
• The `eth_getBalance` method in Web3.js is used to check the balance of an Ethereum account.
• The `eth_getBalance` method is used to transfer Ethereum between accounts.
• The `eth_getBalance` method allows developers to execute smart contracts.

24. How do Ethereum APIs handle transaction nonce management?

• Ethereum APIs use random values for transaction nonce to enhance security.
• Ethereum APIs ensure unique transaction identifiers to prevent replay attacks.
• Ethereum APIs discard nonces once a transaction is executed.
• Ethereum APIs assign the same nonce for all transactions in a block.

25. What is the purpose of the `alchemy-sdk` package in Ethereum development?

• The `alchemy-sdk` package is used to simplify interactions with the Ethereum blockchain by providing a convenient interface for making JSON-RPC requests.
• The `alchemy-sdk` package is primarily for trading Ethereum tokens on decentralized exchanges easily.
• The `alchemy-sdk` package is designed to create and deploy Ethereum contracts automatically without any coding.
• The `alchemy-sdk` package serves as a mining tool that increases transaction speeds on the Ethereum network.

26. What is the difference between a public and private Ethereum network?

• A public Ethereum network is used for testing, while private networks are used for live transactions.
• A public Ethereum network can only be accessed by developers, while private networks are accessible to everyone.
• A public Ethereum network is open to anyone, while a private network is permissioned and controlled.
• A public Ethereum network requires special permission, whereas private networks allow unrestricted access.

27. How do developers set up their project for using an Ethereum API?

• Developers set up their project by using only graphical interfaces for blockchain interactions without coding.
• Developers set up their project by writing contracts directly on the Ethereum mainnet without any local setup.
• Developers set up their project by coding in Python before using any Ethereum libraries.
• Developers set up their project by installing a package manager like npm or yarn and then installing packages such as `alchemy-sdk`.

28. What are the common applications of Web3 APIs?

• Building static web pages and managing CSS styles.
• Processing high-resolution images and editing videos.
• Conducting online marketing campaigns and managing databases.
• Deploying smart contracts, invoking smart contract functions, and interacting with on-chain data.

29. What is the benefit of using a standardized interface like JSON-RPC in Ethereum APIs?

• It increases the complexity of API interactions, requiring developers to write more code for simple tasks.
• Using a standardized interface like JSON-RPC ensures that all Ethereum clients implement the same set of methods, providing a uniform collection of endpoints for applications.
• A standardized interface allows only a single programming language to be used by all developers, limiting flexibility.
• A standardized interface guarantees that all dApps can function on any blockchain, making them completely portable.

30. How do Ethereum APIs ensure transparency in decentralized applications?

• Ethereum APIs restrict access to transaction details to prevent unauthorized use.
• Ethereum APIs ensure transparency by limiting network interaction to a single application only.
• Ethereum APIs enhance privacy by encrypting all user data and transactions.
• Ethereum APIs ensure transparency by providing real-time data access and monitoring network activity.