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WorksheetsWeb3 and Blockchain Challenge
Total questions: 15
Worksheet time: 5mins
What is a smart contract?
A smart contract is a type of cryptocurrency used for trading.
A smart contract is a self-executing contract with the terms written into code on a blockchain.
A smart contract is a traditional legal agreement signed on paper.
A smart contract is a physical document that requires notarization.
How do decentralized finance (DeFi) platforms operate?
Rely on banks for transactions.
Use physical currency.
Use blockchain and smart contracts without intermediaries.
Need a central authority.
What distinguishes a non-fungible token (NFT) from a fungible token?
NFTs can be divided into smaller units.
NFTs are interchangeable, fungible tokens are unique.
NFTs are unique and not interchangeable; fungible tokens are identical and interchangeable.
Both NFTs and fungible tokens are identical and freely exchanged.
What is the purpose of blockchain consensus mechanisms?
To store data centrally.
To remove security in transactions.
To speed up transactions without checks.
To agree on transaction validity and ensure data integrity.
What is crypto mining and how does it work?
Validating transactions and adding them to a blockchain by solving math problems.
Storing cryptocurrencies in a digital wallet.
Creating new cryptocurrencies by buying them.
Trading cryptocurrencies to earn profits.
What are gas fees in the context of blockchain transactions?
Penalties for failed transactions.
Costs paid to miners for processing.
Rewards for holding cryptocurrency.
Amount needed to create a new blockchain.
What is the main difference between proof of work and proof of stake?
Proof of Work is more energy-efficient than Proof of Stake.
Proof of Work is faster than Proof of Stake.
Proof of Stake requires more hardware than Proof of Work.
Proof of Work relies on computational power, while Proof of Stake relies on the amount of cryptocurrency held.
How does a smart contract execute automatically?
A smart contract requires approval from a central authority to execute.
A smart contract runs only during specific times of the day.
A smart contract executes automatically when predefined conditions are met, triggering its code on the blockchain.
A smart contract executes when a user manually triggers it.
What role do liquidity pools play in DeFi?
For staking rewards only.
Provide liquidity for trading and support price stability.
Only for centralized exchanges.
Primarily for lending and borrowing.
What are some common use cases for NFTs?
Digital art, collectibles, virtual real estate, gaming items, and music.
Physical paintings
Printed books
Traditional currency
How does the proof of stake mechanism enhance energy efficiency?
Proof of Stake reduces energy consumption by eliminating energy-intensive mining.
Proof of Stake has no impact on energy efficiency.
Proof of Stake relies on energy-intensive mining processes.
Proof of Stake increases energy consumption by requiring more hardware.
What is the significance of block confirmation in blockchain?
Ensures transaction integrity and security.
Eliminates the need for miners.
Only necessary for large transactions.
Speeds up transaction processing.
How do miners validate transactions in a proof of work system?
By creating digital signatures.
By selecting transactions randomly.
By verifying user identities.
By solving math problems for a valid hash.
What are the risks associated with DeFi platforms?
Centralization
Smart contract flaws, market swings, no regulation, liquidity issues, hacks, governance problems.
Guaranteed profits
High fees
How can gas fees affect transaction speed on a blockchain?
Higher gas fees always result in slower transactions.
Gas fees are only relevant for smart contracts.
Gas fees can speed up transactions by incentivizing miners to prioritize them.
Gas fees have no impact on transaction speed.
