Ethereum Architecture and Transaction Lifecycle BBLC Practice Questions (Page 3)

Questions 11–15

1. 11expert · hard

   A developer is deploying a smart contract that has a complex constructor. The estimated gas required is 1,200,000. The developer sets `gasLimit` to 1,000,000. What will happen?

   • AThe transaction will succeed because the EVM automatically increases the gas limit.
   • BThe contract will be deployed, but only partially initialized.
   • CThe transaction will fail with an out-of-gas error, and the contract will not be deployed.
   • DThe contract will be deployed, but the sender will be charged for the unused gas.
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   In the Ethereum architecture, what is the primary role of a full node?

   • ATo provide a user interface for interacting with decentralized applications
   • BTo only store recent blocks and rely on other nodes for historical data
   • CTo mine new blocks by solving computational puzzles
   • DTo store the entire blockchain state and validate all transactions and blocks
   Reveal Solution Discussion Select an answer first
4. 13application · medium

   A user sends a transaction with a `gasLimit` of 50,000 and a `gasPrice` of 30 gwei. The EVM executes the transaction and consumes 40,000 gas. What happens to the remaining 10,000 gas?

   • AIt is added to the contract's balance.
   • BIt is paid to the block proposer as a tip.
   • CIt is burned by the protocol.
   • DIt is refunded to the sender's account.
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A developer submits a transaction to an Ethereum node using a wallet. The transaction is signed, broadcast, and included in a block. Later, a dApp queries the transaction receipt and sees a status of 0x1. What does this status indicate about the transaction?

   • AThe transaction was mined but its state changes were reverted due to an exception.
   • BThe transaction was included in a block but the block is not yet final.
   • CThe transaction is still pending and has not yet been included in a block.
   • DThe transaction was successfully executed and the state changes were applied.
   Reveal Solution Discussion Select an answer first
6. 15expert · hard

   A company is designing a multi-signature wallet contract that requires approval from two of three directors before funds are sent. Each director has an EOA. Which statement correctly describes the interaction?

   • AThe directors must sign a single transaction together, and the contract verifies the combined signature.
   • BThe directors' EOAs are converted into contract accounts to enable multi-signature functionality.
   • CThe contract itself sends a transaction to each director to request approval.
   • DEach director submits a transaction to the contract to record their approval; the contract then sends funds via a message.
   Reveal Solution Discussion Select an answer first