Basics of Blockchain: Quiz-1

What is the primary purpose of blockchain technology?

• To centralize data storage

• To ensure transparency and immutability

• To replace the internet

• To create digital currencies only

Which of the following is not a key feature of blockchain?

• Decentralization

• Immutability

• Central governance

• Transparency

How does blockchain differ from traditional databases?

• It stores data in rows and columns

• It allows editing of past entries

• It uses a centralized server

• It stores data in blocks linked cryptographically

Which of the following best describes a public blockchain?

• Only known participants have access

• Controlled by a single organization

• Accessible to anyone with an internet connection

• • Used only for private business transactions

What is a consortium blockchain?

• Fully open to the public

• Owned by one entity

• Controlled by a group of pre-selected participants

• Used for social media platforms only

Which type of blockchain combines features of both public and private blockchains?

• Hybrid

• Consortium

• Centralized

• 1. Open source

What does each block in a blockchain typically contain?

• Only personal data

• Randomly generated numbers

• A list of transactions, a timestamp, and a hash of the previous block

• A list of users in the network

What is a ‘hash’ in blockchain terminology?

• A unique identifier for users

• A function that converts data into a fixed-length string

• A permission system

• A transaction fee

What ensures the integrity of the blockchain data structure?

• Email verification

• Centralized servers

• Linking blocks using hashes

• • Regular backups

Which consensus mechanism is associated with solving complex mathematical puzzles?

• Proof of Stake (PoS)

• Proof of Work (PoW)

• Byzantine Fault Tolerance (BFT)

• Raft