Block Chain MCQs

#1. What is the primary purpose of a blockchain in a decentralized network?

To provide security and authentication

To record and verify transactions

To regulate cryptocurrency markets

To create a central authority

To increase transaction costs

#2. Which consensus algorithm is commonly used in blockchain networks?

Proof of Work (PoW)

Proof of Stake (PoS)

Proof of Authority (PoA)

Proof of Transaction (PoT)

Proof of Immutability (PoI)

#3. What is the main advantage of a public blockchain compared to a private one?

High scalability

Greater control over who participates

Enhanced privacy

Improved performance

Open and transparent for anyone to join

#4. Which term refers to the process of combining multiple transactions into a single block on a blockchain?

Transaction Bundling

Block Merging

Transaction Aggregation

Block Compiling

Transaction Pooling

#5. What is the purpose of a cryptographic hash function in blockchain technology?

Data encryption

Data compression

Data validation

Data obfuscation

Data authentication

#6. In a blockchain, what is the role of a node?

Validate transactions and maintain a copy of the ledger

Mine new blocks and create new coins

Create and verify smart contracts

Facilitate peer-to-peer transactions

Conduct security audits

#7. Which type of blockchain allows anyone to read, send transactions, and participate in the consensus process?

Public

Private

Consortium

Permissioned

Hybrid

#8. What is a smart contract in the context of blockchain?

A legally binding agreement written in code

A complex encryption algorithm

A secure way to store private keys

A type of consensus mechanism

A type of blockchain token

#9. Which blockchain platform is known for enabling the creation of decentralized applications (DApps)?

Ethereum

Bitcoin

Ripple

Litecoin

Cardano

#10. What is a fork in the context of blockchain technology?

A type of consensus algorithm

A software update for a blockchain

A cryptographic hash function

A form of public-private key pair

A digital signature

#11. What does the term “double-spending” refer to in the context of cryptocurrencies?

Spending the same cryptocurrency twice

Spending a large amount of cryptocurrency

Spending cryptocurrency on luxury items

Spending cryptocurrency on investments

Spending cryptocurrency on necessities

#12. What is the purpose of a private key in cryptocurrency transactions?

To verify ownership and authorize transactions

To encrypt and secure the transaction

To broadcast the transaction to the network

To generate a public address

To verify the transaction history

#13. Which consensus algorithm aims to achieve consensus through a combination of proof of work and proof of stake?

Delegated Proof of Stake (DPoS)

Practical Byzantine Fault Tolerance (PBFT)

Delegated Byzantine Fault Tolerance (dBFT)

Proof of Burn (PoB)

Proof of Activity (PoA)

#14. What is a genesis block in the context of blockchain technology?

The first block in a blockchain

A specialized mining hardware

A type of cryptographic hash function

The highest value cryptocurrency

A form of private key

#15. Which term refers to the process of distributing new cryptocurrency coins to the network?

Mining

Staking

Minting

Forging

Validating

#16. What is the primary function of a blockchain explorer?

To view and analyze blockchain transactions

To mine new blocks

To create smart contracts

To secure private keys

To validate consensus rules

#17. Which blockchain platform is specifically designed for enterprise-level applications?

Hyperledger Fabric

EOS

TRON

Stellar

NEO

#18. In blockchain technology, what is the purpose of a Merkle tree?

To efficiently verify the contents of a block

To encrypt the data in a block

To create a digital signature

To facilitate peer-to-peer transactions

To validate the consensus algorithm

#19. Which type of blockchain is controlled by a single entity or organization?