Ethereum Module Assessment

Welcome to your Ethereum Module Assessment

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What does the Hardhat Network provide for developers?

A cloud-based Ethereum node

A tool for mining Ethereum

A blockchain explorer

A local Ethereum network for testing and development

Which function in Solidity is used to handle incoming ether transfers?

payable

transfer

fallback

receive

Which of the following is an Ethereum Layer 2 solution that uses Optimistic Rollups?

Optimism

Plasma

ZK-Rollups

Lightning Network

Which of the following best describes a decentralized autonomous organization (DAO)?

A cryptocurrency exchange platform

A central governing body for blockchains

A smart contract-based organization without centralized control

A type of consensus algorithm

When a smart contract is deployed to the Ethereum blockchain, what gets created?

A contract address

A new blockchain

A unique transaction ID

A user account

What does the 'memory' keyword in Solidity indicate?

The location for storing event logs

Data location that is only available during function execution

A function that stores data permanently on the blockchain

A variable that can be accessed by any contract

How does Proof of Stake (PoS) differ from Proof of Work (PoW)?

PoW relies on computational power while PoS relies on ownership of tokens

PoS relies on computational power while PoW relies on ownership of tokens

PoS is used only for private blockchains

PoS and PoW are identical

What is the purpose of an ABI (Application Binary Interface) in Ethereum?

To define the bytecode of a smart contract

To provide a user interface for interacting with the Ethereum network

To define how functions in the smart contract can be called and data can be sent between contracts and external applications

To handle the storage of smart contracts on the blockchain

How can you access the current block's timestamp in Solidity?

msg.timestamp

current.timestam

now

block.timestamp

10.

What is a 'multisig wallet' in Ethereum?

A wallet that supports multiple cryptocurrencies

A wallet that stores smart contracts

A wallet that requires multiple signatures to authorize transactions

A wallet with enhanced security features

11.

What is the Ethereum Contract ABI?

A data structure that facilitates interaction between the EVM and the outside world

A protocol for secure communication between Ethereum nodes

A library for writing smart contracts in Solidity

A tool for compiling smart contracts

12.

What is the '51% attack' in blockchain?

An attack targeting 51% of the transactions

An attack where a single node controls 51% of the network traffic

An attack where miners control 51% of the network's mining power

An attack on the network's consensus algorithm

13.

Which statement is true about Solidity?

Solidity is a low-level assembly language for writing blockchain applications.

Solidity is a purely functional programming language.

Solidity is used for developing smart contracts on the Bitcoin blockchain.

Solidity is an object-oriented, high-level language for implementing smart contracts.

14.

What is the role of the Solc-compiler in Ethereum smart contract development?

To deploy the smart contract on the Ethereum network

To compile the Solidity code into bytecode that can be run on the Ethereum Virtual Machine (EVM)

To execute the smart contract

To provide an interface for interacting with the smart contract

15.

In Hardhat, what is the hardhat-ethers plugin used for?

To deploy smart contracts

To integrate with the Ethers.js library

To run a local Ethereum network

To compile Solidity contracts

16.

Which platform is commonly used to deploy Ethereum-based DApps?

Docker

Heroku

AWS Lambda

IPFS

17.

In Solidity, what is the purpose of the require function?

To check for conditions and throw an error if the condition is not met, reverting the transaction

To specify external libraries required by the smart contract

To import necessary modules for the smart contract

To initiate the smart contract deployment process

18.

Which command is used to compile a Solidity contract using the Solc-compiler?

solc --bin .sol

solc --compile .sol

solc .sol

solc compile .sol

19.

In blockchain terminology, what is 'sharding'?

A method to mine multiple blocks simultaneously

A way to encrypt blockchain data

A method to store data off-chain

A technique to split the blockchain into smaller, more manageable pieces

20.

Which configuration file does Hardhat use for project settings?

hardhat-settings.js

hardhat.config.js

config.hardhat.js

hardhat.config.json

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