• Difficulty - Medium
    Total Plays - 30
    Allowed Time - 10 sec
    Best time - 1.796

    What is a blockchain QA analyst’s task?

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    Explanation:
    A Blockchain QA Analyst is responsible for testing smart contracts, dApps, and blockchain networks to ensure they work as intended. They identify bugs, check performance, and validate security, which is critical for building trust in decentralized applications. This role is increasingly important in blockchain careers, as companies rely on QA analysts to deliver reliable and secure Web3 products.
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  • Difficulty - Medium
    Total Plays - 35
    Allowed Time - 10 sec
    Best time - 0.734

    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 - 32
    Allowed Time - 10 sec
    Best time - 3.504

    What does the immutable keyword do in Solidity?

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    Explanation:
    immutable variables are assigned once during deployment and can’t be changed afterward. They are more gas-efficient than regular storage variables.
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  • Difficulty - Medium
    Total Plays - 32
    Allowed Time - 10 sec
    Best time - 0.985

    Which blockchain introduced smart contracts?

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    Explanation:
    Ethereum popularized smart contracts and allowed developers to build decentralized apps.
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  • Difficulty - Medium
    Total Plays - 34
    Allowed Time - 10 sec
    Best time - 1.883

    Royalties in NFTs allow:

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    Explanation:
    Royalties in NFTs ensure that artists receive a percentage of sales every time their work is resold on secondary markets. This feature provides creators with ongoing income and supports long-term value for their digital art.
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  • Difficulty - Medium
    Total Plays - 28
    Allowed Time - 10 sec
    Best time - 1.238

    Combines PoW and PoS?

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    #B
    #C
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    Explanation:
    Hybrid mechanisms (e.g., Decred) blend PoW mining with PoS voting for balanced security.
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  • Difficulty - Medium
    Total Plays - 23
    Allowed Time - 10 sec
    Best time - 1.725

    "Decentralized oracles" use:

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    #C
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    Explanation:
    Decentralized oracles (e.g., Chainlink) source data from many nodes for trust.
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  • Difficulty - Medium
    Total Plays - 22
    Allowed Time - 10 sec
    Best time - 1.118

    What is Hash?

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    Explanation:
    A hash function is a algorithm that converts data into a fixed-size string (hash value), used for data integrity, security, or quick lookup.
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  • Difficulty - Medium
    Total Plays - 23
    Allowed Time - 10 sec
    Best time - 0.899

    NFT "minting" means:

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    Explanation:
    Minting converts digital files (art, music) into blockchain-based NFTs.
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  • Difficulty - Medium
    Total Plays - 27
    Allowed Time - 10 sec
    Best time - 0.590

    The first block is called:

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    #A
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    Explanation:
    The genesis block is the first block in a blockchain, initiating the chain.
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