Ethereum Deployment Solutions Quiz

1. What is the first step in deploying a smart contract on Ethereum?

• Compiling the contract into bytecode.
• Writing the contract in C++.
• Deploying the contract to a test network.
• Creating the user interface for the contract.

2. How is the bytecode of a smart contract stored on the Ethereum blockchain?

• The bytecode is stored on the blockchain in the memory of miners.
• The bytecode is stored on the blockchain after it is deployed, and an address is assigned to it.
• The bytecode is stored in a temporary cache until the next block is mined.
• The bytecode is kept in a private database that is not accessible publicly.

3. What is the purpose of the sender address and nonce in determining the contract address?

• The sender address uses base58 encoding to generate the contract address.
• The sender address and nonce are concatenated without any encoding to create the contract address.
• The sender address and nonce are RLP encoded and hashed with the keccak-256 algorithm to determine the contract address.
• The sender address is ignored, and the contract address is randomly assigned.

4. What is Remix IDE used for in Ethereum smart contract deployment?

• Remix IDE is used to analyze blockchain data and trends.
• Remix IDE is used to create digital wallets for managing Ether.
• Remix IDE is used to deploy, test, and develop smart contracts.
• Remix IDE is used to mine Ethereum and validate transactions.

5. How do you deploy a smart contract using Remix IDE?

• You deploy a smart contract using Remix IDE by downloading a special Ethereum wallet and sending the contract code via email.
• You deploy a smart contract using Remix IDE by selecting `Deploy` from the dropdown under `Environment,` approving the transaction from MetaMask, and then clicking `Deploy.`
• You deploy a smart contract using Remix IDE by selecting `Compile` from the menu and waiting for the next block confirmation.
• You deploy a smart contract using Remix IDE by writing a deployment script in Python and executing it in a terminal.

6. What tools can be used to deploy smart contracts on Ethereum?

• Docker
• Remix
• GitHub
• Kubernetes

7. What is the role of gas in deploying a smart contract?

• Gas is used to generate the unique address for the smart contract.
• Gas is used to pay for the transaction costs associated with deploying a smart contract.
• Gas is used to verify the smart contract`s code before deployment.
• Gas is used to store the smart contract on the blockchain permanently.

8. How do you create a deployment script for deploying a smart contract?

• You create a deployment script by developing a C++ application to compile and deploy the contract.
• You create a deployment script by making a simple JS script that uses a Tenderly DevNet to access the blockchain and publish the compiled bytecode.
• You create a deployment script by writing a Python script that runs on a local blockchain node.
• You create a deployment script by using a SQL command to insert the contract into the blockchain database.

9. What is Tenderly DevNet used for in smart contract deployment?

• Tenderly DevNet is used to analyze gas prices in Ethereum transactions.
• Tenderly DevNet is used to access the blockchain and publish compiled bytecode for smart contract deployment.
• Tenderly DevNet is used for generating user interfaces for smart contracts.
• Tenderly DevNet is used for creating decentralized applications without smart contracts.

10. How do you deploy a smart contract using Hardhat?

• You deploy a smart contract using Hardhat by packaging all dependencies in a zip file and sending it to the Ethereum network.
• You deploy a smart contract using Hardhat by saving the file in the contracts directory and compiling it with Remix.
• You deploy a smart contract using Hardhat by creating a GUI that connects to Metamask and allowing users to input their contracts.
• You deploy a smart contract using Hardhat by writing a script that deploys the contract via ethers.js and invoking it using `$ npx hardhat run scripts/deploy.ts.`

11. What is the purpose of the private key in deploying a smart contract?

• The private key is used to sign the transaction that contains the contract bytecode.
• The private key verifies the identity of the smart contract itself.
• The private key sets the gas limit for the transaction.
• The private key encrypts the contract code before deployment.

12. What is Infura used for in Ethereum node services?

• Infura is used as an Ethereum node service to access the blockchain.
• Infura is used to develop decentralized applications.
• Infura is used to mine Ethereum blocks.
• Infura is used to create Ethereum tokens.

13. How do you connect MetaMask to Infura for deployments?

• You connect MetaMask to Infura by installing an Infura extension in the browser.
• You connect MetaMask to Infura by selecting Infura from the dropdown under “Environment” in Remix IDE.
• You connect MetaMask to Infura by entering your Infura API key in MetaMask settings.
• You connect MetaMask to Infura by running a local node and linking it to MetaMask.

14. What is Truffle Teams used for in deploying smart contracts?

• Truffle Teams is used to connect MetaMask for deployments, allowing full control over gas prices and speeding up transactions.
• Truffle Teams is used to audit smart contracts for security vulnerabilities.
• Truffle Teams is used to test smart contracts after deployment.
• Truffle Teams is used to compile smart contracts before deployment.

15. What is the Truffle-flattener used for?

• The Truffle-flattener is used to optimize gas fees for transactions.
• The Truffle-flattener is used to create user interfaces for web applications.
• The Truffle-flattener is used to get deployable contracts for Remix from Truffle.
• The Truffle-flattener is used to manage Ethereum node connections.

16. How do you deploy a smart contract using Web3?

• You deploy a smart contract using Web3 by sending Ether to the contract address before it is created.
• You deploy a smart contract using Web3 by manually editing the Ethereum blockchain ledger.
• You deploy a smart contract using Web3 by calling a function from an existing contract that handles deployment.
• You deploy a smart contract using Web3 by creating a new contract instance and calling the `deploy` method with the bytecode and constructor arguments.

17. What is the average block time in Ethereum?

• 14 seconds
• 20 seconds
• 25 seconds
• 10 seconds

18. What is the block size limit in Ethereum?

• 2 KB
• 500 KB
• 10 KB
• 1 MB

19. Can transactions be kept hidden on the public Ethereum network?

• Yes, all transactions can be made secret.
• Yes, transactions can be obscured with encryption.
• No, only some transactions are visible to the public.
• No, all transactions on the public Ethereum network are public.

20. How does gas work in Ethereum transactions?

• Gas is used as an internal pricing mechanism in Ethereum transactions, and it is required to pay for the execution of smart contracts.
• Gas is a type of cryptocurrency used in Ethereum transactions.
• Gas is a fixed fee paid to miners regardless of transaction complexity.
• Gas is only needed for transferring Ether between addresses.

21. What happens if gas runs out without the transaction being complete?

• All state changes are reversed, and the used gas is given to the miner.
• The transaction becomes permanent and cannot be undone.
• The transaction is automatically re-submitted with higher gas.
• The contract is deployed without needing any gas.

22. What is the role of MetaMask in Ethereum smart contract deployment?

• MetaMask is used to interact with the Ethereum network, connect to Infura, and manage gas prices during deployments.
• MetaMask is used to generate Ethereum addresses without transactions.
• MetaMask is used to create blockchain nodes for other developers.
• MetaMask is used to compile smart contracts into bytecode during deployments.

23. How do you speed up or cancel pending transactions using MetaMask?

• You can speed up or cancel pending transactions using MetaMask by selecting the transaction and choosing the desired action.
• You can ignore pending transactions to have them processed faster by the network.
• You can only cancel pending transactions by restarting your MetaMask wallet.
• You can speed up transactions by waiting for the next block confirmation.

24. What is the purpose of the Hardhat-deploy plugin?

• The Hardhat-deploy plugin automatically generates Solidity code for smart contracts.
• The Hardhat-deploy plugin adds the capability to store finished deployments in files.
• The Hardhat-deploy plugin helps in debugging contract code during development.
• The Hardhat-deploy plugin creates a graphical interface for contract interactions.

25. What is the difference between deploying to mainnet and deploying to a test network?

• Mainnet deployments do not require gas fees at all.
• Test network deployments are always faster than mainnet deployments.
• Deploying to mainnet requires real Ether for gas, while deploying to a test network can use free Ether.
• Both mainnet and test network deployments require real Ether.

26. How do you deploy a smart contract using Truffle Teams?

• You deploy a smart contract using a CLI tool with no connection to a wallet.
• You deploy a smart contract using Truffle Teams by connecting MetaMask and using the project dashboard to manage deployments.
• You deploy a smart contract by writing a Python script and running it on local servers.
• You deploy a smart contract by compiling it directly on the Ethereum blockchain.

27. What is the role of Tenderly in smart contract development and deployment?

• Tenderly provides debugging, observability, and infrastructure support for smart contracts.
• Tenderly compiles smart contracts into bytecode for deployment.
• Tenderly acts as a wallet for managing Ether and transactions.
• Tenderly connects directly to Infura for blockchain access.

28. What is the purpose of the `deploy` method in Web3?

• The `deploy` method in Web3 is used to deploy a smart contract by sending a transaction containing the contract bytecode.
• The `deploy` method in Web3 is used to create a new Ethereum account.
• The `deploy` method in Web3 is used to query the current state of a smart contract.
• The `deploy` method in Web3 is used to transfer Ether between accounts.

29. How do you compile a smart contract for deployment?

• You compile a smart contract by manually inserting the code into the Ethereum blockchain.
• You compile a smart contract by uploading it to a web server for processing.
• You compile a smart contract by writing JavaScript code that represents the contract.
• You compile a smart contract by using a Solidity compiler to convert the contract code into bytecode.

30. What is the difference between Remix and Hardhat in smart contract deployment?

• Remix focuses on JavaScript coding, while Hardhat deals with Python smart contracts.
• Remix is only for testing, while Hardhat supports only deployment.
• Remix is used for blockchain analysis, while Hardhat is designed for front-end development.
• Remix is a browser-based IDE for quick mainnet deployments, while Hardhat is a development environment for compiling, deploying, testing, and debugging Ethereum software.