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  • Difficulty - Medium
    Total Plays - 30
    Allowed Time - 10 sec
    Best time - 0.977

    What is the primary purpose of a modifier in Solidity?

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    Explanation:
    Modifiers are used to add conditional logic like access control to functions. They prevent code repetition and keep logic clean.
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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 - 42
    Allowed Time - 10 sec
    Best time - 1.573

    Decentralized exchanges:

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    Explanation:
    Decentralized exchanges (DEXs) operate using smart contracts, which automatically execute trades without the need for intermediaries. This allows users to trade crypto directly from their wallets while maintaining control of their assets
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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 - 31
    Allowed Time - 10 sec
    Best time - 1.603

    Which is NOT a Web3 wallet?

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    Explanation:
    Google Drive is a cloud-based storage service that lets you store, access, and share files online. It offers seamless integration with Google Workspace apps like Docs, Sheets, and Slides.
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  • Difficulty - Medium
    Total Plays - 28
    Allowed Time - 10 sec
    Best time - 1.030

    Gas in Ethereum is measured in:

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    Explanation:
    Gwei is a smaller unit of ETH used to calculate gas costs.
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  • Difficulty - Medium
    Total Plays - 28
    Allowed Time - 10 sec
    Best time - 1.897

    "Liquidity pools" in DeFi are used to:

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    Explanation:
    Pools lock tokens for trading on platforms like Uniswap, replacing traditional order books.
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  • Difficulty - Medium
    Total Plays - 28
    Allowed Time - 10 sec
    Best time - 1.643

    Gas limits prevent:

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    Explanation:
    Gas limits set a maximum amount of computation a transaction can use, preventing infinite loops or excessively long operations from running indefinitely. This protects the network and user funds by halting transactions that exceed the limit.
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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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    Explanation:
    Hybrid mechanisms (e.g., Decred) blend PoW mining with PoS voting for balanced security.
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  • Difficulty - Medium
    Total Plays - 20
    Allowed Time - 10 sec
    Best time - 2.104

    Sybil attacks target:

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    Explanation:
    Sybil attacks create fake nodes to disrupt consensus or censor transactions.
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  • Difficulty - Medium
    Total Plays - 19
    Allowed Time - 10 sec
    Best time - 0.954

    Oracle "data freshness" ensures:

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    Explanation:
    Fresh data prevents outdated inputs (e.g., stale prices) from breaking contracts.
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  • Difficulty - Medium
    Total Plays - 27
    Allowed Time - 10 sec
    Best time - 1.325

    DeFi relies on oracles for:

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    Explanation:
    DeFi protocols need real-world price data (e.g., ETH/USD) to execute core functions like determining loan collateral ratios, triggering liquidations, or enabling decentralized trades — all of which require oracles to securely fetch and verify external market prices.
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  • Difficulty - Medium
    Total Plays - 23
    Allowed Time - 10 sec
    Best time - 1.725

    "Decentralized oracles" use:

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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 - 25
    Allowed Time - 10 sec
    Best time - 1.584

    ERC-20 tokens are

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    Explanation:
    ERC-20 is a standard for creating interchangeable tokens like cryptocurrencies or rewards.
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  • Difficulty - Medium
    Total Plays - 20
    Allowed Time - 10 sec
    Best time - 0.789

    Faster transactions than PoW?

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    Explanation:
    PoS processes transactions faster by skipping energy-intensive mining. Chains like Ethereum 2.0 use it.
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  • Difficulty - Medium
    Total Plays - 28
    Allowed Time - 10 sec
    Best time - 1.139

    Tokenomics" refers to

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    Explanation:
    Tokenomics refers to the economic design and structure of a cryptocurrency or token, including how it is created, distributed, and managed. It encompasses factors like total supply, allocation, inflation, utility, and incentives that influence the token's value and usage within a blockchain ecosystem.
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