In which of the following areas are smart contracts commonly applied?

Traditional banking for processing credit card payments.

Decentralized finance (DeFi) for lending, borrowing, and trading.

Social media platforms for storing user profiles.

Operating systems for managing hardware resources.

A developer is building a contract that needs to call another contract's function. The called contract might not exist or might throw an exception. The developer wants to handle failures gracefully without reverting the entire transaction. Which approach should they use?

Use a try/catch block around the external call.

Use a delegatecall to the other contract to preserve the caller's storage.

Use a low-level call and check the boolean return value to handle failure.

Use a high-level interface call and let the exception propagate.

A team is deploying a smart contract that will hold a large amount of Ether. They want to ensure that if a vulnerability is discovered, they can recover the funds. Which design pattern should they implement?

Use a time-lock that delays all withdrawals by a month, giving the team time to react.

Store the funds in a separate contract that has no functions to withdraw, making them inaccessible.

Use a selfdestruct function that can be called by anyone to destroy the contract and send funds to the owner.

Implement a pause mechanism that allows the owner to halt critical functions, and a migration function to move funds to a new contract.

A DeFi platform wants to create a token that can be traded on decentralized exchanges. They need to follow a standard interface so that wallets and exchanges can interact with it. Which approach should they use?

Implement the ERC-20 standard, including functions like transfer, approve, and transferFrom.

Create a custom token with unique function names that only their platform can use.

Use a non-fungible token standard like ERC-721 for the token.

Deploy the token as a smart contract with no standard interface, relying on off-chain APIs.

EC-CouncilBlockchain Business Leader Certification

Domain 4Objective 2

Ethereum Smart Contracts BBLC Practice Questions (Page 8)

Part of the Ethereum, Smart Contracts, and dApps domain, which makes up ~14% of our current practice bank.

44questions here

9free pages

8concepts

Questions 36–40

36foundation · easy
In which of the following areas are smart contracts commonly applied?
Select an answer first
37expert · hard
A developer is building a contract that needs to call another contract's function. The called contract might not exist or might throw an exception. The developer wants to handle failures gracefully without reverting the entire transaction. Which approach should they use?
Select an answer first
38expert · hard
A team is deploying a smart contract that will hold a large amount of Ether. They want to ensure that if a vulnerability is discovered, they can recover the funds. Which design pattern should they implement?
Select an answer first
39foundation · easy
Which of the following is the most widely used programming language for writing Ethereum smart contracts?
Select an answer first
40application · medium
A DeFi platform wants to create a token that can be traded on decentralized exchanges. They need to follow a standard interface so that wallets and exchanges can interact with it. Which approach should they use?
Select an answer first

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