All questions
of 30What is Ethereum and how does it differ from Bitcoin?
Answer it yourself first - out loud, or typed below.
How should your speech become text?
Listening… your words appear above as you speak - tap Stop when you're done.
Recording · cr - tap Stop & transcribe when you're done.
Transcribing with AI…
Voice:
Last attempt -
Ethereum is a decentralized blockchain platform that enables the creation of smart contracts and decentralized applications (DApps). While Bitcoin is primarily a digital currency focused on peer-to-peer transactions, Ethereum is a programmable blockchain that acts as a "world computer."
Key differences:
- Purpose: Bitcoin is digital money; Ethereum is a platform for decentralized applications
- Programming: Ethereum is Turing-complete with its own programming language (Solidity)
- Virtual Machine: Ethereum has the Ethereum Virtual Machine (EVM) for executing smart contracts
- Gas System: Ethereum uses gas to measure computational work
- Block Time: Ethereum has faster block times (~12 seconds vs Bitcoin's ~10 minutes)
This answer doesn't lend itself to a diagram - it reads best . No credits were charged.
The model's verdict: “”
The interactive diagram is below the answer - jump to diagram ↓
This answer is explained by a shared concept diagram - open →
What is a smart contract?
Answer it yourself first - out loud, or typed below.
How should your speech become text?
Listening… your words appear above as you speak - tap Stop when you're done.
Recording · cr - tap Stop & transcribe when you're done.
Transcribing with AI…
Voice:
Last attempt -
A smart contract is a self-executing contract with terms directly written into code. It automatically executes when predetermined conditions are met, without requiring intermediaries.
Key characteristics:
- Immutable: Once deployed, code cannot be changed (unless designed with upgradability)
- Deterministic: Same input always produces same output
- Autonomous: Executes automatically when conditions are met
- Transparent: Code is publicly visible on the blockchain
Example use case: An escrow contract that automatically releases funds when both parties confirm completion of a service.
This answer doesn't lend itself to a diagram - it reads best . No credits were charged.
The model's verdict: “”
The interactive diagram is below the answer - jump to diagram ↓
This answer is explained by a shared concept diagram - open →
Explain the concept of decentralization in Ethereum.
Answer it yourself first - out loud, or typed below.
How should your speech become text?
Listening… your words appear above as you speak - tap Stop when you're done.
Recording · cr - tap Stop & transcribe when you're done.
Transcribing with AI…
Voice:
Last attempt -
Decentralization in Ethereum means that no single entity controls the network. Instead, it's maintained by thousands of nodes worldwide.
Three types of decentralization:
- Architectural: No single point of failure (distributed nodes)
- Political: No single person/organization controls the system
- Logical: Shared state and protocols across all participants
Benefits include censorship resistance, reduced single points of failure, and increased security through distributed consensus.
This answer doesn't lend itself to a diagram - it reads best . No credits were charged.
The model's verdict: “”
The interactive diagram is below the answer - jump to diagram ↓
This answer is explained by a shared concept diagram - open →
What is Ether (ETH) and what are its primary uses?
Answer it yourself first - out loud, or typed below.
How should your speech become text?
Listening… your words appear above as you speak - tap Stop when you're done.
Recording · cr - tap Stop & transcribe when you're done.
Transcribing with AI…
Voice:
Last attempt -
Ether (ETH) is Ethereum's native cryptocurrency. It serves multiple purposes:
- Gas fees: Pay for transaction execution and smart contract operations
- Staking: Validators stake ETH to secure the network (Proof of Stake)
- Store of value: Digital asset for investment and savings
- Medium of exchange: Payment method in DApps and DeFi protocols
- Unit of account: Pricing mechanism for tokens and services
ETH is divisible to 18 decimal places, with the smallest unit called "wei" (1 ETH = 10^18 wei).
This answer doesn't lend itself to a diagram - it reads best . No credits were charged.
The model's verdict: “”
The interactive diagram is below the answer - jump to diagram ↓
This answer is explained by a shared concept diagram - open →
What is Solidity and why is it used for Ethereum development?
What is a constructor in Solidity and when is it executed?
What is gas in Ethereum and why is it necessary?
What is the difference between mainnet, testnet, and private networks?
What are the main tools used in Ethereum development?
What is the Ethereum Virtual Machine (EVM)?
Explain the difference between `view`, `pure`, and `payable` function modifiers.
What are events in Solidity and why are they important?
Explain the difference between `storage`, `memory`, and `calldata` in Solidity.
Explain the difference between gas limit and gas price.
What happens when a transaction runs out of gas?
How do you optimize gas usage in smart contracts?
What is the difference between Ethereum 1.0 and Ethereum 2.0?
Explain Proof of Stake vs Proof of Work in the context of Ethereum.
What are Ethereum nodes and what types exist?
What is DeFi (Decentralized Finance) and how does it work on Ethereum?
Explain what an ERC-20 token is and its standard functions.
What is the difference between ERC-20, ERC-721, and ERC-1155 tokens?
Explain the concept of slippage in DeFi and why it matters.
How do you test smart contracts effectively?
What is a reentrancy attack and how can it be prevented?
What are some common smart contract vulnerabilities?
What are Layer 2 scaling solutions and how do they work?
What is sharding and how will it improve Ethereum scalability?
What is Maximum Extractable Value (MEV) and how does it affect Ethereum?
Explain the concept of composability in DeFi (often called "Money Legos").
This answer is part of Pro.
The full written answer, with the trade-offs and follow-ups an interviewer will probe.
No matches
Try a different filter or search term.
26 of 30 Ethereum answers are gated.
Full answers, code samples, AI explanations - simpler, deeper, or as an interactive diagram. Cancel anytime.
- Full answers + code
- AI explain - simpler, deeper, or visualized
- 1,000 AI credits / month
- Cancel anytime
Change topic
Pick a different technology or stack. Your current topic stays put until you choose a new one.
MEAN
MongoDB, Express, Angular, Node.jsMERN
MongoDB, Express, React, Node.jsLAMP
Linux, Apache, MySQL, PHPRuby on Rails
Convention over ConfigurationJAM
JavaScript, APIs, and MarkupServerless on AWS
Serverless Architecture on AWSInterviewers also test these - they're common to every stack, whichever one you picked above.
Flutter Mobile
Flutter Cross-Platform Mobile DevelopmentInterviewers also test these - they're common to every stack, whichever one you picked above.
Spring Boot
Enterprise Java Development.NET
Microsoft EcosystemVue
Vue.js, Vite, TypeScript, Tailwind, Node.jsGo Backend
Golang, gRPC, PostgreSQL, Redis, RabbitMQFastAPI
Python, FastAPI, SQLAlchemy, PostgreSQLReact Native
React, TypeScript, Redux, FirebaseiOS Native
Swift, SwiftUI, UIKit, FirebaseAndroid Native
Java, Jetpack Compose, FirebaseWeb3 / Ethereum
Solidity, Ethereum, Hardhat, FoundryDevOps / Platform
Docker, Kubernetes, Terraform, CI/CDCore SWE Interview Prep
Data structures, algorithms, OS, concurrency, networking, gitInterviewers also test these - they're common to every stack, whichever one you picked above.
Interviewers also test these - they're common to every stack, whichever one you picked above.