Blockchain 101 Certification Blockchain 101 Certification Smart Contracts & DApps

Question 1

What is a smart contract?

Accepted Answer

Self-executing code stored on a blockchain that runs when predefined conditions are met

Answer

A legal PDF stored on a blockchain

Answer

An encrypted email agreement

Answer

A multi-signature wallet

Question 2

Which programming language is primarily used to write Ethereum smart contracts?

Accepted Answer

Solidity

Answer

JavaScript

Answer

Python

Answer

Rust

Question 3

What is the Ethereum Virtual Machine (EVM)?

Accepted Answer

A sandboxed runtime that executes smart contract bytecode on every Ethereum node

Answer

A cloud server hosting Ethereum nodes

Answer

A hardware wallet for Ether

Answer

An off-chain computation engine

Question 4

What is 'gas' in the context of Ethereum smart contracts?

Accepted Answer

A measure of computational effort required to execute operations, paid in Ether

Answer

A native token separate from Ether

Answer

A smart contract language feature

Answer

A consensus reward mechanism

Question 5

What is a DApp (Decentralized Application)?

Accepted Answer

An application whose backend logic runs on a decentralized blockchain network

Answer

An app with no user interface

Answer

A mobile app that mines cryptocurrency

Answer

A database distributed across servers

Question 6

What is an ABI (Application Binary Interface) in Ethereum development?

Accepted Answer

A JSON specification describing how to interact with a deployed smart contract

Answer

A wallet encryption standard

Answer

A block serialization format

Answer

An identity protocol