Ethereum Ecosystem, EVM, and Role in Financial Markets BFC Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A company wants to create a token that can be used both as a currency and to represent ownership of a specific asset. The token should be able to handle both fungible and non-fungible types in a single contract. Which Ethereum standard is most appropriate?

   • AERC-20
   • BERC-1400
   • CERC-1155
   • DERC-721
   Reveal Solution Discussion Select an answer first
2. 17expert · hard

   A bank is evaluating Ethereum as a settlement layer for cross-border payments. The bank's compliance team requires finality within seconds and low energy consumption. The bank also wants to avoid the cost of running its own infrastructure. Which approach best satisfies these requirements?

   • AUse Ethereum mainnet with a Layer 2 rollup
   • BUse Ethereum mainnet with Proof of Stake
   • CUse a permissioned Ethereum-based consortium chain with a small set of validators
   • DUse a private Ethereum chain with a single validator
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A developer is writing a smart contract that will be executed by the EVM. The contract must handle a large array of user balances. The developer is concerned about high gas costs. Which approach would most effectively reduce the gas cost of updating a single balance?

   • AStore the balances in a mapping instead of an array
   • BStore balances in memory instead of storage
   • CUse a smaller integer type, such as uint8, for all balances
   • DIncrease the gas limit for the transaction
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   An asset management firm is building a platform that allows investors to trade tokenized real estate properties. Each property is represented as a unique token, and investors can also hold a fungible token that represents a share in a property fund. The firm wants to use a single smart contract to manage both types of tokens. Which Ethereum standard should they implement?

   • ADeploy two separate contracts, one for each token type, and link them with a registry.
   • BERC-721 only, because it supports unique tokens.
   • CERC-1155, because it supports both fungible and non-fungible tokens in a single contract.
   • DERC-20 only, because it is the most common standard for tokens.
   Reveal Solution Discussion Select an answer first
6. 20application · medium

   A developer is writing a smart contract that needs to call another smart contract on Ethereum. The developer is concerned about the gas cost of the external call. Which EVM feature is most relevant to this concern?

   • AThe TIMESTAMP opcode, which provides block time
   • BThe BLOCKHASH opcode, which retrieves block hashes
   • CThe CALL opcode, which forwards a specified amount of gas
   • DThe SSTORE opcode, which stores data
   Reveal Solution Discussion Select an answer first