Virtual Labs

Comparative Analysis of Consensus Algorithms

Why do blockchain networks need a consensus algorithm?

a: To allow only one person to control the network Explanation

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b: To randomly delete old transactions Explanation

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c: To ensure that all participants agree on the current state of the ledger Explanation

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d: To convert transactions into audio files Explanation

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Which of the following is TRUE about decentralized systems?

a: Only one central authority verifies all transactions Explanation

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b: Multiple participants work together without a central authority Explanation

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c: Transactions are kept secret and never verified Explanation

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d: They work without the need for validation Explanation

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What is the main role of miners in Proof of Work?

a: To watch and comment on transactions Explanation

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b: To create usernames for blockchain users Explanation

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c: To solve mathematical problems to validate transactions and add new blocks Explanation

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d: To transfer data from blockchain to cloud storage Explanation

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What does a validator do in Proof of Stake?

a: Deletes unnecessary blocks from the chain Explanation

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b: Validates new blocks based on the amount of cryptocurrency staked Explanation

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c: Changes the blockchain rules regularly Explanation

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d: Encrypts user passwords for security Explanation

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Which consensus algorithm is generally considered more energy-efficient?

a: Proof of Work Explanation

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b: Proof of Stake Explanation

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c: Proof of Activity Explanation

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d: Proof of Time Explanation

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In blockchain, what is a ‘block’?

a: A video file stored in the cloud Explanation

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b: A digital file that contains a group of verified transactions Explanation

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c: A piece of hardware connected to the server Explanation

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d: A program that locks user accounts Explanation

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