Washington Blockchain Technology
Certification Questions And Correct Answer
with Rational (100% verified answer) Q & A
2026 /Instant download PDF
1. What is blockchain technology primarily designed to provide?
A. Centralized storage
B. Distributed and secure record keeping
C. Faster gaming performance
D. Offline networking
Correct Answer: B. Distributed and secure record keeping
Rationale: Blockchain creates a decentralized ledger where records are securely
stored across multiple nodes.
2. Which feature makes blockchain records difficult to alter?
A. Compression
B. Encryption and hashing
C. Email verification
D. Cloud syncing
Correct Answer: B. Encryption and hashing
Rationale: Cryptographic hashing links blocks together, making unauthorized
changes easily detectable.
3. What is a block in blockchain?
A. A gaming file
B. A storage device
,C. A container of transaction data
D. A network cable
Correct Answer: C. A container of transaction data
Rationale: Each block stores transaction details and connects to previous blocks
using hashes.
4. Which consensus mechanism is used by Bitcoin?
A. Proof of Stake
B. Delegated Proof of Stake
C. Proof of Work
D. Proof of Authority
Correct Answer: C. Proof of Work
Rationale: Bitcoin relies on Proof of Work where miners solve complex
mathematical problems.
5. What is mining in blockchain?
A. Data deletion
B. Verifying and adding transactions to the blockchain
C. Network hacking
D. Password encryption
Correct Answer: B. Verifying and adding transactions to the blockchain
Rationale: Mining validates transactions and adds new blocks to the blockchain
ledger.
6. Which cryptocurrency introduced blockchain technology?
A. Ethereum
B. Ripple
,C. Bitcoin
D. Solana
Correct Answer: C. Bitcoin
Rationale: Bitcoin was the first successful implementation of blockchain
technology.
7. What is a smart contract?
A. A legal document
B. A self-executing program on a blockchain
C. A network switch
D. A digital wallet
Correct Answer: B. A self-executing program on a blockchain
Rationale: Smart contracts automatically execute predefined conditions without
intermediaries.
8. Which blockchain platform is widely known for smart contracts?
A. Ethereum
B. PayPal
C. Dropbox
D. Oracle
Correct Answer: A. Ethereum
Rationale: Ethereum popularized smart contracts and decentralized applications.
9. What does decentralization mean in blockchain?
A. One organization controls data
B. Data is stored on a single server
C. Control is distributed among participants
D. No internet connection is required
, Correct Answer: C. Control is distributed among participants
Rationale: Blockchain distributes authority and data across many nodes.
10. What is the primary role of cryptography in blockchain?
A. Increase file size
B. Secure transactions and data
C. Improve monitor display
D. Speed up typing
Correct Answer: B. Secure transactions and data
Rationale: Cryptography protects blockchain transactions from tampering and
unauthorized access.
11. What is a node in blockchain?
A. A printer
B. A participant device connected to the blockchain network
C. A USB device
D. A firewall rule
Correct Answer: B. A participant device connected to the blockchain network
Rationale: Nodes maintain and validate blockchain data across the network.
12. Which term refers to digital money operating on blockchain?
A. Cryptocurrency
B. Database
C. Spreadsheet
D. Hyperlink
Correct Answer: A. Cryptocurrency
Rationale: Cryptocurrencies use blockchain for secure digital transactions.
Certification Questions And Correct Answer
with Rational (100% verified answer) Q & A
2026 /Instant download PDF
1. What is blockchain technology primarily designed to provide?
A. Centralized storage
B. Distributed and secure record keeping
C. Faster gaming performance
D. Offline networking
Correct Answer: B. Distributed and secure record keeping
Rationale: Blockchain creates a decentralized ledger where records are securely
stored across multiple nodes.
2. Which feature makes blockchain records difficult to alter?
A. Compression
B. Encryption and hashing
C. Email verification
D. Cloud syncing
Correct Answer: B. Encryption and hashing
Rationale: Cryptographic hashing links blocks together, making unauthorized
changes easily detectable.
3. What is a block in blockchain?
A. A gaming file
B. A storage device
,C. A container of transaction data
D. A network cable
Correct Answer: C. A container of transaction data
Rationale: Each block stores transaction details and connects to previous blocks
using hashes.
4. Which consensus mechanism is used by Bitcoin?
A. Proof of Stake
B. Delegated Proof of Stake
C. Proof of Work
D. Proof of Authority
Correct Answer: C. Proof of Work
Rationale: Bitcoin relies on Proof of Work where miners solve complex
mathematical problems.
5. What is mining in blockchain?
A. Data deletion
B. Verifying and adding transactions to the blockchain
C. Network hacking
D. Password encryption
Correct Answer: B. Verifying and adding transactions to the blockchain
Rationale: Mining validates transactions and adds new blocks to the blockchain
ledger.
6. Which cryptocurrency introduced blockchain technology?
A. Ethereum
B. Ripple
,C. Bitcoin
D. Solana
Correct Answer: C. Bitcoin
Rationale: Bitcoin was the first successful implementation of blockchain
technology.
7. What is a smart contract?
A. A legal document
B. A self-executing program on a blockchain
C. A network switch
D. A digital wallet
Correct Answer: B. A self-executing program on a blockchain
Rationale: Smart contracts automatically execute predefined conditions without
intermediaries.
8. Which blockchain platform is widely known for smart contracts?
A. Ethereum
B. PayPal
C. Dropbox
D. Oracle
Correct Answer: A. Ethereum
Rationale: Ethereum popularized smart contracts and decentralized applications.
9. What does decentralization mean in blockchain?
A. One organization controls data
B. Data is stored on a single server
C. Control is distributed among participants
D. No internet connection is required
, Correct Answer: C. Control is distributed among participants
Rationale: Blockchain distributes authority and data across many nodes.
10. What is the primary role of cryptography in blockchain?
A. Increase file size
B. Secure transactions and data
C. Improve monitor display
D. Speed up typing
Correct Answer: B. Secure transactions and data
Rationale: Cryptography protects blockchain transactions from tampering and
unauthorized access.
11. What is a node in blockchain?
A. A printer
B. A participant device connected to the blockchain network
C. A USB device
D. A firewall rule
Correct Answer: B. A participant device connected to the blockchain network
Rationale: Nodes maintain and validate blockchain data across the network.
12. Which term refers to digital money operating on blockchain?
A. Cryptocurrency
B. Database
C. Spreadsheet
D. Hyperlink
Correct Answer: A. Cryptocurrency
Rationale: Cryptocurrencies use blockchain for secure digital transactions.
