quiz·10 min·Chapter 3 of 3

Quiz: Blockchain Basics

❓Quiz — 5 Questions

Pass: 60%

1.What is a distributed ledger?

A single centralized databaseA database shared and synchronized across multiple nodesA spreadsheet stored on one serverA file system used by blockchains only

2.What does each block in a blockchain contain?

Only transaction dataA hash of the next blockA hash of the previous block, forming an immutable chainA random number unrelated to other blocks

3.What hash function does Bitcoin use?

MD5SHA-256Keccak-256RIPEMD-160

4.What property of hash functions means a small input change causes a drastically different output?

Collision resistancePre-image resistanceAvalanche effectDeterminism

5.What is the main purpose of a consensus mechanism?

To encrypt transactionsTo allow nodes to agree on the state of the ledgerTo compress blockchain dataTo generate new tokens

Finished!

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