Security and Compliance in Smart Contracts BBLC Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which of the following is a common smart contract vulnerability that occurs when a contract sends Ether to an external address and the receiving contract's fallback function re-enters the calling contract before the first execution completes?

   • AFront-running
   • BReentrancy
   • CDenial of service
   • DInteger overflow
   Reveal Solution Discussion Select an answer first
2. 17expert · hard

   A DAO's smart contract has a governance function that allows token holders to vote on proposals. The contract is immutable and has no emergency pause. A malicious proposal is passed that drains the treasury. The DAO is considering a hard fork to reverse the transaction. Which consideration is most critical?

   • AThe hard fork will automatically restore all lost funds.
   • BThe hard fork may split the community and create two competing chains.
   • CThe hard fork is the only way to maintain the immutability principle.
   • DThe hard fork will be accepted by all exchanges and wallets.
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   Which process involves mathematically proving that a smart contract's code satisfies its specification for all possible inputs?

   • ADynamic testing
   • BTest coverage analysis
   • CFormal verification
   • DStatic analysis
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   What is the primary purpose of measuring test coverage in smart contract testing?

   • ATo automatically fix bugs in the contract
   • BTo prove that the contract is free of all vulnerabilities
   • CTo replace the need for manual code review
   • DTo identify which parts of the code have been executed by the test suite
   Reveal Solution Discussion Select an answer first
6. 20application · medium

   A developer is writing a Solidity function that transfers tokens to a user. The function uses a loop to iterate over an array of recipients. Which security concern is most directly associated with this pattern?

   • AReentrancy attack during the transfer.
   • BInteger overflow in the loop counter.
   • CAccess control bypass in the loop.
   • DDenial of service (DoS) via excessive gas consumption.
   Reveal Solution Discussion Select an answer first