Smart Contracts and Solidity Programming

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What is the primary purpose of a smart contract?

To establish initial states in a blockchain

To make digital promises related to blockchain transactions (correct)

To store and refund gas in a blockchain

To execute computations unrelated to blockchain transactions

Which programming language is designed for Ethereum smart contracts?

Rust

JavaScript

Solidity (correct)

C++

What type of tokens does ERC20 represent?

Immutable tokens

Non-fungible tokens

Blockchain security tokens

Fungible tokens (correct)

Which type of variables are stored in the blockchain permanently?

State variables Signup and view all the answers

What is the size of an Ethereum address?

20 bytes Signup and view all the answers

Which type of memory is stored during function execution and is cheaper?

Memory Signup and view all the answers

What type of tokens does ERC721 represent?

Non-fungible tokens Signup and view all the answers

Which type of variables are cheapest and manipulated by inline assembly?

Stack variables Signup and view all the answers

What type of value does the 'address' variable represent?

20-byte value (size of an Ethereum address) Signup and view all the answers

What was the first proposed year of smart contracts?

1990s Signup and view all the answers

What is the visibility of a state variable that can be accessed by the defined / derived contract?

Internal Signup and view all the answers

Which function visibility allows other contracts to read their values?

Public Signup and view all the answers

What type of function can not modify states or call other non-view functions?

View functions Signup and view all the answers

Which special function must be external and payable with no function keyword, arguments, or return values?

Fallback function Signup and view all the answers

What is the ERC standard for Fungible token?

ERC-20 Signup and view all the answers

What does ERC-721 represent?

An extension of ERC-721 interface Signup and view all the answers

How is 0.5 ETH sent using decimals?

Use decimals = 1, transfer(to, 5) Signup and view all the answers

What does ABI stand for in Ethereum?

Application Binary Interface Signup and view all the answers

"mint" and "transferFrom" are part of the implementation of which standard?

ERC-20 Signup and view all the answers

"Point to a JSON file describing the token attributes (name, description, image…)" is related to which standard?

"ERC-721" Signup and view all the answers