• Difficulty - Medium
    Total Plays - 39
    Allowed Time - 10 sec
    Best time - 1.466

    Which is a risk of using oracles?

    Tip: Click "Play" to reveal options and start playing.

    #A
    #B
    #C
    #D
    Explanation:
    Centralized oracles can be a single point of failure. If they provide false data, contracts relying on them can be exploited.
    Leaderboard
  • Difficulty - Medium
    Total Plays - 29
    Allowed Time - 10 sec
    Best time - 1.368

    What does an Eclipse attack target?

    Tip: Click "Play" to reveal options and start playing.

    #A
    #B
    #C
    #D
    Explanation:
    In an Eclipse attack, an attacker isolates a node from the network, feeding it false data. This can lead to incorrect transaction processing or vulnerability to double spending.
    Leaderboard
  • Difficulty - Medium
    Total Plays - 32
    Allowed Time - 10 sec
    Best time - 3.504

    What does the immutable keyword do in Solidity?

    Tip: Click "Play" to reveal options and start playing.

    #A
    #B
    #C
    #D
    Explanation:
    immutable variables are assigned once during deployment and can’t be changed afterward. They are more gas-efficient than regular storage variables.
    Leaderboard
  • Difficulty - Medium
    Total Plays - 30
    Allowed Time - 10 sec
    Best time - 0.977

    What is the primary purpose of a modifier in Solidity?

    Tip: Click "Play" to reveal options and start playing.

    #A
    #B
    #C
    #D
    Explanation:
    Modifiers are used to add conditional logic like access control to functions. They prevent code repetition and keep logic clean.
    Leaderboard
  • Difficulty - Medium
    Total Plays - 32
    Allowed Time - 10 sec
    Best time - 0.985

    Which blockchain introduced smart contracts?

    Tip: Click "Play" to reveal options and start playing.

    #A
    #B
    #C
    #D
    Explanation:
    Ethereum popularized smart contracts and allowed developers to build decentralized apps.
    Leaderboard
  • Difficulty - Medium
    Total Plays - 42
    Allowed Time - 10 sec
    Best time - 1.573

    Decentralized exchanges:

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    #A
    #B
    #C
    #D
    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
    Leaderboard
  • Difficulty - Medium
    Total Plays - 34
    Allowed Time - 10 sec
    Best time - 1.883

    Royalties in NFTs allow:

    Tip: Click "Play" to reveal options and start playing.

    #A
    #B
    #C
    #D
    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.
    Leaderboard
  • Difficulty - Medium
    Total Plays - 31
    Allowed Time - 10 sec
    Best time - 1.603

    Which is NOT a Web3 wallet?

    Tip: Click "Play" to reveal options and start playing.

    #A
    #B
    #C
    #D
    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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    #A
    #B
    #C
    #D
    Explanation:
    Gwei is a smaller unit of ETH used to calculate gas costs.
    Leaderboard
  • ABHI

    ABHI

    @2QFzVmG • Apr 15, 2025

    Hello ArtofBlockchain Community

    Hello Everyone!I'm excited to be a part of the ArtofBlockchain club and connect with like-minded folks who are passionate about decentralization, innovation, and the future of technology!My name is Abhiram...
    Like 5 Replies 4
  • Difficulty - Medium
    Total Plays - 28
    Allowed Time - 10 sec
    Best time - 1.897

    "Liquidity pools" in DeFi are used to:

    Tip: Click "Play" to reveal options and start playing.

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

    Gas limits prevent:

    Tip: Click "Play" to reveal options and start playing.

    #A
    #B
    #C
    #D
    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.
    Leaderboard
  • Difficulty - Medium
    Total Plays - 28
    Allowed Time - 10 sec
    Best time - 1.238

    Combines PoW and PoS?

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    #A
    #B
    #C
    #D
    Explanation:
    Hybrid mechanisms (e.g., Decred) blend PoW mining with PoS voting for balanced security.
    Leaderboard
  • Difficulty - Medium
    Total Plays - 20
    Allowed Time - 10 sec
    Best time - 2.104

    Sybil attacks target:

    Tip: Click "Play" to reveal options and start playing.

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

    Oracle "data freshness" ensures:

    Tip: Click "Play" to reveal options and start playing.

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

    DeFi relies on oracles for:

    Tip: Click "Play" to reveal options and start playing.

    #A
    #B
    #C
    #D
    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.
    Leaderboard