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

Smart contracts are programs deployed on a blockchain that automatically execute agreed-upon logic when specific conditions are satisfied without intermediaries.

Question 2

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

Accepted Answer

Solidity

Answer

Solidity is the most widely used statically-typed, contract-oriented programming language for writing Ethereum smart contracts.

Question 3

What is the Ethereum Virtual Machine (EVM)?

Accepted Answer

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

Answer

The EVM is a deterministic stack-based virtual machine that executes smart contract bytecode consistently across all Ethereum nodes.

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

Gas quantifies the computation cost of each EVM operation, and users pay gas fees in Ether to compensate validators for executing their transactions.

Question 5

What is a DApp (Decentralized Application)?

Accepted Answer

An application whose backend logic runs on a decentralized blockchain network

Answer

A DApp combines a user-facing frontend with smart contract backend logic on a blockchain, removing reliance on centralized servers.

Blockchain 101 Certification Practice Test

Blockchain 101 Certification Practice Test

Blockchain 101 Certification Blockchain 101 Certification Smart Contracts & DApps