Ethereum's Transactions, Validation, and Upgrades BDC Practice Questions (Page 7)

Questions 31–35

1. 31foundation · easy

   What happens if a transaction's gas limit is set below the intrinsic gas required for the transaction?

   • AThe transaction is queued until the gas price drops
   • BThe transaction is rejected as invalid
   • CThe transaction is executed partially and then reverted
   • DThe transaction is executed but with a warning
   Reveal Solution Discussion Select an answer first
2. 32application · medium

   A developer is reading about the London upgrade and wants to understand its impact on transaction fees. Which statement accurately describes the change introduced by EIP-1559?

   • AThe base fee is set by the miner and can vary per transaction.
   • BTransactions now include a base fee and a priority fee; the base fee is burned, and the priority fee goes to the validator.
   • CTransactions now specify a gas price that is entirely paid to the miner, with no burning.
   • DThe gas limit is now determined by the protocol and cannot be changed by users.
   Reveal Solution Discussion Select an answer first
4. 33foundation · easy

   How does transaction validation change after The Merge?

   • ATransactions are still validated by executing them and checking state transitions, but block production is now done by validators
   • BTransactions are validated by a central authority
   • CTransactions are no longer validated; they are accepted blindly
   • DTransactions are validated using a different cryptographic algorithm
   Reveal Solution Discussion Select an answer first
5. 34foundation · easy

   Which of the following is an example of an internal transaction (message call)?

   • AA user sends ether to another user's address
   • BA user signs a transaction with their private key
   • CA contract calls another contract's function
   • DA miner includes a transaction in a block
   Reveal Solution Discussion Select an answer first
6. 35application · medium

   A user signs and broadcasts a transaction, but it is not included in the next block. The transaction remains in the mempool. Which of the following is the most likely reason?

   • AThe transaction's nonce is lower than the sender's current nonce, so it is considered a replacement.
   • BThe transaction's data field is too large, so it is waiting for a block with more space.
   • CThe transaction's signature is invalid, so it is queued for later validation.
   • DThe transaction's gas price is too low relative to the current base fee, so miners are not incentivized to include it.
   Reveal Solution Discussion Select an answer first