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  • Difficulty - Medium
    Total Plays - 82
    Allowed Time - 10 sec
    Best time - 0.822 sec

    What does OpenZeppelin provide?

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    Explanation:
    OpenZeppelin offers audited, reusable smart contract templates, like ERC-20 and ERC-721 implementations. It enhances security and saves development time.
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  • Difficulty - Medium
    Total Plays - 61
    Allowed Time - 10 sec
    Best time - 0.081

    What is Web3.js used for?

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    Explanation:
    Web3.js is a JavaScript library for interacting with Ethereum, enabling dApps to communicate with nodes. It handles tasks like sending transactions and reading blockchain data.
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  • How to Become a Blockchain Engineer: Choose Your Track, Build Proof, and Prepare for Hiring Screens

    Updated for 2026: This guide focuses on choosing the right blockchain engineering track, building a recruiter-readable proof pack, and preparing for early hiring screens where teams check GitHub, tests, README clarity, debugging maturity, and project explanation. How do you become a blockchain engineer without choosing...
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  • Difficulty - Medium
    Total Plays - 52
    Allowed Time - 10 sec
    Best time - 1.130

    What enables cross-chain communication?

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    Explanation:
    Interoperability protocols allow different blockchains to communicate and share data or assets seamlessly. Examples include Polkadot and Cosmos, which facilitate cross-chain transactions.
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  • Difficulty - Medium
    Total Plays - 63
    Allowed Time - 10 sec
    Best time - 1.128

    What does Ganache provide in blockchain?

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    Explanation:
    Ganache creates a local Ethereum blockchain for development and testing. It allows developers to deploy contracts and simulate transactions without real ETH.
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  • Difficulty - Medium
    Total Plays - 54
    Allowed Time - 10 sec
    Best time - 1.527

    What is a token standard?

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    Explanation:
    A token standard, like ERC-20, defines rules for creating tokens on a blockchain. It ensures compatibility for cross-chain transfers and DeFi applications.
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  • Difficulty - Medium
    Total Plays - 43
    Allowed Time - 10 sec
    Best time - 1.626

    What Rust feature optimizes blockchain transaction processing?

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    Explanation:
    Rust’s async programming, with crates like Tokio, enables high-throughput transaction processing in blockchain nodes. It supports concurrent handling of network requests and validations.
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  • Difficulty - Medium
    Total Plays - 47
    Allowed Time - 10 sec
    Best time - 1.379

    What is the primary purpose of a blockchain?

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    Explanation:
    A blockchain is a secure, digital ledger that records transactions in a way that is hard to change. Each block stores data and links to the one before it, making the chain tamper-proof.
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  • Difficulty - Medium
    Total Plays - 54
    Allowed Time - 10 sec
    Best time - 1.182

    Which consensus offers fastest finality?

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    Explanation:
    BFT-based (Byzantine Fault Tolerant) consensus mechanisms achieve instant or near-instant finality by requiring agreement among validators in just one round of communication, allowing transactions to be finalized in seconds—faster than PoW, PoS, or DPoS.
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  • Difficulty - Medium
    Total Plays - 41
    Allowed Time - 10 sec
    Best time - 2.038

    What’s the purpose of an NFT whitelist?

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    Explanation:
    Whitelists let selected users mint first. It rewards loyal fans and avoids gas spikes.
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  • Difficulty - Medium
    Total Plays - 41
    Allowed Time - 10 sec
    Best time - 1.375

    Why is Rust preferred for high-performance blockchain runtimes?

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    Explanation:
    Rust’s zero-cost abstractions allow developers to write high-level code without runtime performance penalties, ideal for blockchain runtimes. This ensures efficient execution of smart contracts and consensus algorithms.
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  • Difficulty - Medium
    Total Plays - 42
    Allowed Time - 10 sec
    Best time - 2.230 sec

    Stablecoins are pegged to:

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    Stablecoins are pegged to:
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    Explanation:
    Stablecoin is the Crypto with value pegged to a stable asset like the US dollar, to reduce volatility.
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  • Difficulty - Medium
    Total Plays - 42
    Allowed Time - 10 sec
    Best time - 1.735

    Immutability in blockchain means:

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    Immutability in blockchain means:
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    Explanation:
    Once data is added to a blockchain, it can’t be altered, ensuring trust.
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  • Difficulty - Medium
    Total Plays - 67
    Allowed Time - 10 sec
    Best time - 1.561 sec

    What is the EVM?

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    Explanation:
    The Ethereum Virtual Machine (EVM) is a global, decentralized computer that executes smart contracts on the Ethereum blockchain. It ensures every node produces the same results, keeping the network consistent and secure.
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  • Difficulty - Medium
    Total Plays - 385
    Allowed Time - 10 sec
    Best time - 1.017

    A smart contract is:

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    Explanation:
    Smart contracts automate actions when conditions are met.
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  • Difficulty - Medium
    Total Plays - 48
    Allowed Time - 10 sec
    Best time - 1.153

    Q. Which best describes a 51% attack in blockchain?

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    Explanation:
    A 51% attack happens when one miner/validator controls over half the network’s power or stake. This lets them rewrite history or double-spend coins, threatening security. It’s rare on large chains like Bitcoin but a risk for smaller ones.
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