Blockchain Technology Online Test

Created by

Vikash chaudhary

This 'Blockchain Technology Online Test' covers questions across all the topics related to the Blockchain from basic to advanced.

Get fresh, new questions in each attempt.

Total Questions: 30
Time Allotted: 30 minutes
Passing Score: 50%
Randomization: Yes
Certificate: Yes
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1 / 30

1. What is the main purpose of the difficulty adjustment in blockchain mining?

a) To increase the value of cryptocurrency

b) To regulate the speed at which new blocks are added

c) To change user permissions

d) To store transaction histories

2 / 30

2. Which of the following is an example of an asymmetric encryption algorithm?

a) AES

b) RSA

c) 3DES

d) Blowfish

3 / 30

3. What is Proof of Authority (PoA)?

a) A consensus algorithm where participants are rewarded based on the amount of cryptocurrency they hold or stake

b) A mechanism for selecting the next block proposer in a blockchain network

c) A consensus algorithm where network validators are identified and authorized to validate transactions based on their identity or reputation

d) A cryptographic algorithm used for digital signatures

4 / 30

4. What is a Sybil attack in the context of blockchain?

a) An attack where malicious nodes overwhelm the network with legitimate transactions

b) An attack where an attacker controls multiple nodes to manipulate network consensus

c) An attack where a majority of network participants collude to alter transaction records

d) An attack where an individual node floods the network with spam transactions

5 / 30

5. What is Elliptic Curve Cryptography (ECC)?

a) A symmetric encryption algorithm

b) A hashing algorithm

c) An asymmetric encryption algorithm

d) A digital signature algorithm

6 / 30

6. Which blockchain platform introduced the concept of smart contracts?

a) Bitcoin

b) Ethereum

c) Ripple

d) Litecoin

7 / 30

7. What is one notable use case of Hyperledger Fabric?

a) Cross-border payments

b) Decentralized finance (DeFi) applications

c) Supply chain management

d) Decentralized social media platforms

8 / 30

8. What is the potential impact of blockchain on healthcare data management?

a) Blockchain increases the risk of data breaches in healthcare

b) Blockchain improves the efficiency and integrity of healthcare data management

c) Blockchain restricts access to healthcare data for patients and providers

d) Blockchain has no impact on healthcare data management

9 / 30

9. What does the blockchain trilemma refer to?

a) The three main components of blockchain technology

b) The complexity of blockchain consensus mechanisms

c) The trade-off between decentralization, security, and scalability in blockchain networks

d) The impact of blockchain on global economies

10 / 30

10. What is one of the main uses of private blockchains?

a) Public data sharing

b) Cryptocurrencies

c) Enterprise-level applications

d) Decentralized social networks

11 / 30

11. Which feature is unique to consortium blockchains compared to public and private blockchains?

a) Centralized control by a single organization

b) Open access to any user

c) Collaborative control by multiple organizations

d) No need for consensus mechanisms

12 / 30

12. What are some potential benefits of integrating blockchain with IoT?

a) Decreased data security and integrity in IoT networks

b) Increased vulnerability to data breaches and cyber attacks

c) Enhanced data traceability and auditability in IoT ecosystems

d) Limited scalability and interoperability of IoT devices

13 / 30

13. What is a mining pool in blockchain?

a) A physical location where miners gather to mine cryptocurrencies

b) A group of miners who combine their computational resources to increase their chances of successfully mining blocks and share the rewards

c) A software tool used by miners to manage their mining operations

d) A decentralized network of mining nodes

14 / 30

14. What connects each block to the previous one in a blockchain?

a) A timestamp

b) A cryptographic hash of the previous block

c) The user's signature

d) The transaction ID

15 / 30

15. What happens when a block’s hash meets the difficulty target in a proof-of-work blockchain?

a) The block is discarded

b) The block is added to the blockchain

c) The block is encrypted

d) The block is split into smaller blocks

16 / 30

16. What is the role of miners in the Bitcoin blockchain network?

a) To verify transactions and add them to the blockchain

b) To encrypt data on the blockchain

c) To distribute rewards to network participants

d) To select the next block proposer

17 / 30

17. Which characteristic is crucial for a cryptographic hash function?

a) Deterministic

b) Slow

c) Easily reversible

d) Consumes large amounts of memory

18 / 30

18. In blockchain, what is the primary purpose of a nonce?

a) To verify user identities

b) To secure transaction data

c) To vary the input for the hash function to meet the difficulty target

d) To connect blocks

19 / 30

19. What is a key use case of blockchain technology in healthcare?

a) Securing patient data and medical records

b) Enhancing hospital infrastructure

c) Providing medical diagnosis and treatment

d) Managing supply chain logistics

20 / 30

20. What is the purpose of tokenization in DApps?

a) To create a centralized system for controlling access to the application

b) To facilitate transactions and incentivize user participation

c) To increase the speed and scalability of the application

d) To reduce the security risks associated with decentralized networks

21 / 30

21. What is the main purpose of SHA-256 in blockchain?

a) To encrypt transaction data

b) To generate digital signatures

c) To create unique identifiers for blocks and transactions

d) To decrypt encrypted data

22 / 30

22. What is a blockchain platform?

a) A physical location where blockchain transactions are conducted

b) A software system that provides the infrastructure for building and deploying blockchain applications

c) A type of cryptocurrency wallet

d) A cryptographic algorithm used for encryption

23 / 30

23. What is the main advantage of using Elliptic Curve Cryptography (ECC) in blockchain?

a) Lower computational requirements

b) Higher energy consumption

c) Slower transaction processing

d) Larger key sizes

24 / 30

24. How does blockchain enhance the security of patient data in healthcare?

a) By encrypting data with traditional encryption methods

b) By decentralizing storage and access to patient data

c) By centralizing control over patient data with healthcare providers

d) By restricting access to patient data through closed networks

25 / 30

25. How does a Merkle tree improve the efficiency of a blockchain?

a) By encrypting data

b) By storing user identities

c) By summarizing and verifying large sets of transactions efficiently

d) By reducing block size

26 / 30

26. What is the primary goal of a Sybil attack?

a) To increase network efficiency and security

b) To decrease transaction fees

c) To manipulate network consensus and gain control over the blockchain

d) To enhance decentralization of the blockchain network

27 / 30

27. In the context of mining, what is a block header?

a) The first transaction in a block

b) The last transaction in a block

c) The metadata containing information about a block

d) The nonce used to solve the cryptographic puzzle

28 / 30

28. What role does a public key play in verifying a digital signature?

a) It encrypts the signature

b) It hashes the data

c) It verifies the authenticity of the digital signature

d) It decrypts the original data

29 / 30

29. How do cryptocurrencies enable secure and transparent transactions?

a) By relying on centralized servers for transaction processing

b) By using cryptographic techniques and blockchain technology

c) By storing user data on public databases

d) By requiring users to disclose personal information for every transaction

30 / 30

30. How does a digital signature ensure the integrity of a blockchain transaction?

a) By encrypting the transaction data

b) By creating a unique hash that can be verified with the sender’s private key

c) By storing the transaction on a central server

d) By using the same key for all transactions

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Blockchain Technology Online Test

This 'Blockchain Technology Online Test' covers questions across all the topics related to the Blockchain from basic to advanced.

Please provide accurate information so we can send your Achievement Certificate by mail.

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