FREE Cryptocurrency Smart Contracts and dApps Questions and Answers

Question 1

A decentralized application (dApp) for agricultural insurance is designed to automatically pay out claims to farmers if a drought is officially declared in their region.
The smart contract needs access to reliable, real-world weather data to trigger these payments.
What component is essential for the smart contract to securely receive this external information?

Accepted Answer

A decentralized oracle network to feed external data to the blockchain.

Answer

A state channel to accelerate data processing.

Answer

A sidechain to store historical weather patterns.

Answer

An application binary interface (ABI) to connect directly to a government weather API.

Question 2

What is the primary function of 'gas' in the context of the Ethereum network?

Accepted Answer

To measure the computational effort required to execute operations and to compensate validators.

Answer

To serve as a long-term store of value for network participants.

Answer

To encrypt the data within a transaction before it is added to a block.

Answer

To determine the voting power of a token holder in a DAO.

Question 3

A developer is creating a platform for digital art, where each piece is unique and can be individually owned and traded. Which Ethereum token standard is most appropriate for representing these one-of-a-kind digital assets?

Accepted Answer

ERC-721

Answer

ERC-20

Answer

ERC-1155

Answer

ERC-777

Question 4

Which of the following is a key characteristic that distinguishes a decentralized application (dApp) from a traditional, centralized web application?

Accepted Answer

The backend logic of a dApp is executed via smart contracts on a peer-to-peer network.

Answer

dApps are typically hosted on a single, high-performance server for maximum speed.

Answer

User data in a dApp is controlled and owned exclusively by the development company.

Answer

dApps cannot have a front-end user interface and must be operated via command line.

Question 5

A new online collective wants to manage a shared treasury and make decisions about funding projects based on member votes. They want the rules for governance and fund allocation to be transparent and automatically enforced by code. Which type of organization would best suit their needs?

Accepted Answer

A Decentralized Autonomous Organization (DAO).

Answer

A multi-signature wallet controlled by a board of directors.

Answer

A traditional non-profit organization with a legal charter.

Answer

A centralized application with a user polling feature.

Question 6

A user sends a transaction to interact with a complex DeFi smart contract on Ethereum. They set a 'gas limit' that is too low for the required computations. What is the most likely outcome?

Accepted Answer

The transaction will fail, any state changes will be reverted, and the entire gas fee will be consumed.

Answer

The transaction will be partially executed up to the gas limit, and the remaining gas will be refunded.

Answer

The transaction will be put in a pending state indefinitely until the user adds more gas.

Answer

The transaction will be completed successfully, but the network will automatically charge the user's wallet for the extra gas needed.