Blockchain MCQ Questions and Answers for Practice

1. A block in the blockchain can never have more than one parent block?

1. True Statement
2. False Statement

2. Asymmetric encryption uses:

1. Public keys only
2. Private keys only
3. Public and Private keys
4. Proof of Stake

3. Bitcoin is based on ............... blockchain?

1. Private
2. Public
3. Public Permissioned
4. Permissioned

4. Blockchain can be stored as which of the following?

1. A flat file
2. A Database
3. Both of the above
4. None of the above

5. Blockchain forks can result in which of the following?

1. Multiple parent blocks
2. Multiple children blocks

6. Each block of a Blockchain consists of which of the following?

1. A hash pointer to the previous block
2. Timestamp
3. List of transactions
4. All of the above

7. Hash identifying each block in the Blockchain is generated using which of the following cryptographic algorithm?

1. SHA128
2. SHA256

8. In blockchain, blocks are linked

1. Backward to the previous block
2. Forward to next block
3. Not linked with each other

9. The primary benefit of immutability is

1. Scalability
2. Improved Security
3. Tamper ProofIncreased Efficiency

10. What are the different types of tokens?

1. Platform
2. Privacy
3. Currency
4. All of the above

11. What does P2P stand for?

1. Password to Password
2. Peer to Peer
3. Product to Product
4. Private Key to Public Key

12. What is a blockchain?

1. A distributed ledger on a peer to peer network
2. A type of cryptocurrency
3. An exchange
4. A centralized ledger

13. What is a miner?

1. A type of blockchain
2. An algorithm that predicts the next part of the chain
3. A person doing calculations to verify a transaction
4. Computers that validate and process blockchain transactions

14. What is a node?

1. A type of cryptocurrency
2. A blockchain
3. A computer on a blockchain network
4. An exchange

15. What is a private key?

1. A key on your key chain
2. A key given to the public
3. A key NOT to be given to the public
4. A key that opens a secret door