Ethereum Ecosystem, EVM, and Role in Financial Markets BFC Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   Which consensus mechanism does Ethereum currently use after 'The Merge'?

   • AProof of Work (PoW)
   • BDelegated Proof of Stake (DPoS)
   • CProof of Stake (PoS)
   • DProof of Authority (PoA)
   Reveal Solution Discussion Select an answer first
2. 27application · medium

   A trader is using a decentralized exchange (DEX) on Ethereum to swap tokens. The transaction has been pending for a long time because the gas price was set too low. The trader wants the transaction to be processed quickly. What should the trader do?

   • AWait for the network to become less congested, as the transaction will eventually be mined.
   • BIncrease the gas limit of the pending transaction.
   • CSubmit a new transaction with a higher gas price and the same nonce, replacing the pending one.
   • DCancel the transaction by sending a zero-value transaction with the same nonce and a higher gas price.
   Reveal Solution Discussion Select an answer first
4. 28application · medium

   A developer is debugging a smart contract that is behaving unexpectedly. The contract's state changes are not what the developer expected. Which tool would be most useful to trace the execution of the contract and inspect the state changes at each step?

   • AA debugger like Remix Debugger or Hardhat's console.log, which allows step-by-step execution and state inspection.
   • BA wallet like MetaMask, which shows transaction history.
   • CA blockchain explorer like Etherscan, which shows transaction receipts and logs.
   • DA node like Geth, which can be used to query the blockchain but not to trace contract execution.
   Reveal Solution Discussion Select an answer first
5. 29foundation · easy

   In the context of financial markets, what is tokenization on Ethereum?

   • AThe process of mining new Ether coins
   • BThe process of validating blocks in the network
   • CThe process of encrypting transaction data
   • DThe process of converting physical assets into digital tokens on a blockchain
   Reveal Solution Discussion Select an answer first
6. 30application · medium

   A digital asset exchange wants to list a new token that represents ownership of tokenized real estate. The token must be transferable only to verified investors and must support fractional ownership. Which Ethereum standard should the exchange require the token issuer to implement?

   • AERC-721
   • BERC-1400
   • CERC-1155
   • DERC-20
   Reveal Solution Discussion Select an answer first