MCQ for Ch-I (Page 13 to 23 from One Note Ch-I)

What is a key characteristic of a blockchain's data?

• Maintained by a central entity.
• Owned and managed by the customer.
• Only added through group consensus.
• Controlled by a single provider.

Which of these are benefits of decentralization?

• Improved data reconciliation.
• Increased weak points.
• Trustless environment.
• Reduced weak points.
• Centralized resource distribution.

Which type of blockchain is open-source and allows anyone to participate?

• Private blockchain.
• Hybrid blockchain.
• Consortium blockchain.
• Public blockchain.

What are characteristics of public blockchains?

• Transactions are private.
• Highly resistant to censorship.
• Designed to be fully decentralized.
• All transactions are fully transparent.
• Participants need consent to join.

What is a key feature of private blockchains?

• Anyone can examine transaction details.
• They are more centralized than public blockchains.
• They are open-source for all.
• They always have a token linked to them.

Which blockchain is an example of a hybrid type?

• Bitcoin.
• Hyperledger.
• Dragonchain.
• R3 Corda.

What do consensus mechanisms help prevent?

• Economic attacks.
• 51% attacks.
• Centralized control.
• Data reconciliation issues.

Which cryptocurrency uses the Proof-of-Work (PoW) mechanism?

• Dash.
• NEO.
• Bitcoin.
• EOS.

What describes the Proof of Stake (PoS) mechanism?

• Requires a lot of energy.
• Uses a random algorithm for consensus building.
• Mining power is based on tokens held.
• Aims to ensure miners support the project long-term.
• Delegates perform transaction validation.

What is an advantage of Delegated Proof of Stake (DPoS)?

• Lower speed of verification.
• Higher scalability.
• Centralized control by a single entity.
• Requires more computing power.