Ethereum Standards and Proposal Processes BDC Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   A token developer is implementing an ERC-20 token and wants to ensure that a specific smart contract can spend tokens on behalf of users. They have written the token contract and the spender contract. What is the correct sequence of operations for a user to allow the spender to transfer tokens?

   • ASpender calls approve() on the token contract, then user calls transferFrom()
   • BUser calls approve() on the token contract, then the spender calls transferFrom()
   • CUser calls transfer() to the spender contract, then spender calls transferFrom()
   • DSpender calls transferFrom() directly without any approval
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   Which of the following is an example of an ERC standard that defines an application-level interface?

   • AERC-20
   • BEIP-1559
   • CEIP-1014
   • DEIP-155
   Reveal Solution Discussion Select an answer first
4. 3expert · hard

   An NFT project is considering whether to implement ERC-721 or ERC-1155 for a collection of 10,000 unique digital pets. Each pet has unique traits, but the team also wants to allow breeding to create new pets. They expect high transaction volume and want to minimize gas costs for users. What should they choose?

   • AA custom standard that combines ERC-721 and ERC-20 features
   • BERC-1155, because it allows batch minting and transfers, reducing gas costs for high-volume operations
   • CERC-20, because it is the most gas-efficient standard
   • DERC-721, because it is the standard for unique assets and is required by major marketplaces
   Reveal Solution Discussion Select an answer first
5. 4expert · hard

   A developer is considering whether to propose a new EIP that would change the Ethereum Virtual Machine (EVM) opcode pricing. They are concerned about the governance process. What is the most accurate statement about how such a protocol-level EIP would be adopted?

   • AIt would be adopted if the Ethereum Foundation approves it
   • BIt would be adopted automatically once it reaches 'Final' status
   • CIt would be adopted if a majority of dApp developers vote for it
   • DIt requires implementation in Ethereum clients and coordination through a network upgrade
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   An EIP author has received feedback from the community and updated their proposal. The EIP is now in the 'Last Call' stage. What does this stage signify?

   • AThe EIP is open for final review and comments before being considered for Final status
   • BThe EIP has been implemented in all Ethereum clients
   • CThe EIP has been rejected by the editors
   • DThe EIP is finalized and cannot be changed
   Reveal Solution Discussion Select an answer first