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Blockchain and Solidity Interview Questions

Solidity

  1. What is Solidity, and why is it important for Ethereum development?

    • Hint: Discuss Solidity as a programming language for writing smart contracts on Ethereum.

  2. What are smart contracts? How do they work?

    • Hint: Explain self-executing contracts with the terms directly written into code.

  3. Can you describe the Ethereum Virtual Machine (EVM)?

    • Hint: Discuss EVM as a decentralized computer that executes smart contracts.

  4. What are gas fees in Ethereum? How are they calculated?

    • Hint: Explain the concept of gas, its role in transactions, and how fees are determined.

  5. How do you handle exceptions in Solidity?

    • Hint: Discuss try-catch mechanisms and error handling patterns in Solidity.

  6. What are some common security vulnerabilities in Solidity smart contracts?

    • Hint: Mention reentrancy, integer overflow/underflow, and insecure randomness.

  7. What is the difference between call, delegatecall, and send in Solidity?

    • Hint: Explain each function's purpose and differences in context and security implications.

  8. How do you deploy a smart contract on the Ethereum network?

    • Hint: Discuss using tools like Remix, Truffle, or Hardhat for deployment.

  9. What is a Solidity library? How is it used?

    • Hint: Describe reusable code that can be deployed once and used by other contracts.

  10. What is the purpose of the require statement in Solidity?

    • Hint: Explain its use for validation and ensuring conditions are met.

  11. Can you explain the concept of ERC-20 tokens?

    • Hint: Describe the standard for creating fungible tokens on Ethereum.

  12. What is the difference between ERC-20 and ERC-721 tokens?

    • Hint: Compare fungible (ERC-20) vs. non-fungible (ERC-721) tokens.

  13. What is a blockchain oracle, and why is it important?

    • Hint: Discuss how oracles provide external data to smart contracts.

  14. How do you ensure the immutability of smart contracts?

    • Hint: Explain deployment principles and the challenges of upgrading contracts.

  15. What is the role of consensus mechanisms in blockchain?

    • Hint: Discuss mechanisms like Proof of Work (PoW) and Proof of Stake (PoS).

  16. How do you interact with a smart contract from a web application?

    • Hint: Mention using Web3.js or Ethers.js for interaction.

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