Blockchain Quiz

Which of the following best defines a distributed system?

• A system where all nodes are controlled by a single authority

• A system where two or more nodes collaborate to achieve a unified goal

• A centralized system that distributes tasks to multiple users

• A system that operates independently without any communication between nodes

What is the primary challenge highlighted by the Byzantine Generals Problem?

• Efficient data storage in blockchain networks

• Ensuring consensus in a distributed system despite malicious nodes

• Improving transaction speed in peer-to-peer networks

• Managing high-energy consumption in blockchain mining

In blockchain, what is the purpose of the Merkle root in a block?

• It acts as a timestamp for when the block was created

• It stores the digital signature of the miner who created the block

• It provides a hashed representation of all transactions in the block for efficient verification

• It determines the next block to be added to the chain

What is the primary function of the consensus layer in blockchain architecture?

• It provides communication between nodes over the internet

• It ensures agreement among nodes regarding the state of the blockchain

• It encrypts transactions using public-key cryptography

• It allows decentralized applications (DApps) to execute transactions

Which of the following is NOT an advantage of blockchain technology?

• High availability

• Immutability

• Decentralization

• Unlimited scalability

What differentiates a private blockchain from a public blockchain?

• Private blockchains are accessible to anyone, while public blockchains require permission

• Private blockchains restrict access to selected participants, while public blockchains are open to all

• Private blockchains do not use consensus mechanisms, while public blockchains do

• Public blockchains are primarily used for enterprise applications, while private blockchains are not

Which hash function is used in Bitcoin’s Proof of Work (PoW) mechanism?

• MD5

• SHA-1

• SHA-256

• SHA-3

Which encryption mode is NOT recommended due to its security vulnerabilities?

• Cipher Block Chaining

• Counter (CTR) mode

• Electronic Code Book (ECB

• Galois/Counter Mode (GCM)

Which property of a hash function ensures that it is computationally infeasible to find two different inputs producing the same hash output?

• Pre-image resistance

• Avalanche effect

• Collision resistance

• Hack Proof

How often does Bitcoin adjust its mining difficulty?

• Every 210,000 blocks

• Every 10 blocks

• Every time a block is mined

• Every 2,016 blocks