Blockchain Technology Solved MCQs 1–10: Basics of Blockchain What is Blockchain? A) A type of database B) A cryptocurrenc...
Blockchain Technology Solved MCQs
1–10: Basics of Blockchain
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What is Blockchain?
A) A type of database
B) A cryptocurrency
C) A programming language
D) A web browser
✔️ Answer: A
Explanation: Blockchain is a distributed, immutable ledger or database that stores information in blocks. -
Who is credited with the invention of blockchain technology?
A) Vitalik Buterin
B) Elon Musk
C) Satoshi Nakamoto
D) Charles Babbage
✔️ Answer: C
Explanation: Satoshi Nakamoto introduced blockchain as part of Bitcoin in 2008. -
What is a block in the blockchain?
A) A physical chain
B) A type of currency
C) A digital record containing transactions
D) A password
✔️ Answer: C -
Which of the following is true about blockchain?
A) Centralized
B) Only one copy of data
C) Decentralized and distributed
D) Temporary
✔️ Answer: C -
What links one block to the next in a blockchain?
A) Password
B) Signature
C) Hash of the previous block
D) Timestamp
✔️ Answer: C -
Which cryptographic technique secures blockchain data?
A) Caesar cipher
B) Public-private key encryption
C) Base64
D) SHA-1
✔️ Answer: B -
The consensus algorithm in Bitcoin is:
A) PoS
B) PoW
C) DPoS
D) PoA
✔️ Answer: B
Explanation: Bitcoin uses Proof of Work (PoW) to validate transactions. -
Which programming language is often used for smart contracts in Ethereum?
A) Python
B) Java
C) Solidity
D) PHP
✔️ Answer: C -
What is mining in blockchain?
A) Generating new coins
B) Validating transactions and adding blocks
C) Sending emails
D) Blocking users
✔️ Answer: B -
Which is the first blockchain-based cryptocurrency?
A) Ethereum
B) Dogecoin
C) Litecoin
D) Bitcoin
✔️ Answer: D
11–20: Blockchain Components and Features
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A blockchain ledger is:
A) Centralized
B) Private
C) Immutable
D) Editable
✔️ Answer: C -
A decentralized network ensures:
A) One point of failure
B) Greater control
C) No central authority
D) Less privacy
✔️ Answer: C -
What is a hash function?
A) A sorting algorithm
B) A mathematical function used to encrypt data
C) A server
D) A virus
✔️ Answer: B -
Which property of blockchain makes it tamper-proof?
A) Decentralization
B) Hashing and consensus
C) Rebooting
D) Central storage
✔️ Answer: B -
The full copy of blockchain is stored by:
A) Node
B) Wallet
C) User
D) Admin
✔️ Answer: A -
Which block contains the first transaction in a blockchain?
A) Genesis block
B) Root block
C) Main block
D) Super block
✔️ Answer: A -
What does a node do in a blockchain?
A) Only store data
B) Only mine blocks
C) Maintain and validate blockchain
D) Generate images
✔️ Answer: C -
Which of the following is NOT a feature of blockchain?
A) Transparency
B) Immutability
C) Central control
D) Security
✔️ Answer: C -
Which term refers to breaking up blockchain into smaller parts?
A) Partitioning
B) Forking
C) Sharding
D) Chunking
✔️ Answer: C -
Which ledger type does blockchain represent?
A) Private
B) Public
C) Distributed
D) Linear
✔️ Answer: C
21–30: Blockchain Types and Use Cases
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Public blockchains are:
A) Permissioned
B) Private
C) Open to anyone
D) Government restricted
✔️ Answer: C -
Which blockchain is primarily used for smart contracts?
A) Bitcoin
B) Ethereum
C) Ripple
D) Litecoin
✔️ Answer: B -
A private blockchain is typically used by:
A) Open source developers
B) Crypto traders
C) Enterprises and organizations
D) Miners
✔️ Answer: C -
Which of the following is a use case of blockchain in healthcare?
A) Video conferencing
B) Secure patient data
C) Treating diseases
D) Medical exams
✔️ Answer: B -
Blockchain in supply chain improves:
A) Manual entry
B) Product traceability
C) Cost of goods
D) Advertising
✔️ Answer: B -
NFTs are based on which technology?
A) AI
B) IoT
C) Blockchain
D) 3D Printing
✔️ Answer: C -
Which industry uses blockchain for anti-counterfeiting?
A) Gaming
B) Textile
C) Pharmaceuticals
D) Tourism
✔️ Answer: C -
What is DeFi?
A) Data Firewall
B) Decentralized Finance
C) Default Internet
D) Digital File
✔️ Answer: B -
Which cryptocurrency platform is focused on DeFi?
A) Dogecoin
B) Ethereum
C) Bitcoin Cash
D) Litecoin
✔️ Answer: B -
Which tech giant is involved in enterprise blockchain (Hyperledger)?
A) Microsoft
B) IBM
C) Google
D) Oracle
✔️ Answer: B
31–40: Security, Consensus & Protocols
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Which algorithm is energy-intensive?
A) PoS
B) PoA
C) PoW
D) DPoS
✔️ Answer: C -
Which consensus algorithm is faster and less energy-consuming?
A) Proof of Work
B) Proof of Stake
C) Hashing
D) Mining
✔️ Answer: B -
A fork in blockchain means:
A) Connection break
B) Two competing versions of the chain
C) Server crash
D) Speed up
✔️ Answer: B -
Double-spending means:
A) Paying twice accidentally
B) Using the same cryptocurrency for two transactions
C) Price doubling
D) Mining rewards
✔️ Answer: B -
51% attack refers to:
A) DDoS
B) Virus
C) Control of majority of the network’s power
D) Software update
✔️ Answer: C -
Which of these prevents fraud in blockchain?
A) Central admin
B) Firewalls
C) Consensus mechanism
D) Smart TVs
✔️ Answer: C -
Zero-knowledge proof provides:
A) Verification without revealing information
B) Data loss
C) Node shutdown
D) Faster mining
✔️ Answer: A -
Byzantine Fault Tolerance refers to:
A) A hacking method
B) A power grid system
C) Tolerance to dishonest nodes
D) Computer failure
✔️ Answer: C -
Which blockchain platform is known for fast transactions?
A) Bitcoin
B) Solana
C) Litecoin
D) Monero
✔️ Answer: B -
Smart contracts are:
A) Written contracts
B) Contracts stored and executed on blockchain
C) Lawyer agreements
D) PDF documents
✔️ Answer: B
41–50: Current Trends and Blockchain in Pakistan
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Which Pakistani bank launched blockchain for cross-border payments?
A) Meezan Bank
B) Habib Bank
C) Bank Alfalah
D) Allied Bank
✔️ Answer: C -
Which city hosts Pakistan’s first blockchain institute?
A) Lahore
B) Islamabad
C) Karachi
D) Peshawar
✔️ Answer: C -
Which country banned cryptocurrency but explores blockchain?
A) China
B) USA
C) India
D) UK
✔️ Answer: A -
Which sector in Pakistan can benefit from blockchain in land records?
A) Education
B) Health
C) Real estate
D) Sports
✔️ Answer: C -
Which Pakistani government body showed interest in blockchain?
A) PTA
B) NADRA
C) SECP
D) FBR
✔️ Answer: C -
Pakistan’s SBP stance on crypto trading (as of 2025):
A) Legal
B) Illegal
C) Fully regulated
D) Encouraged
✔️ Answer: B -
Which university offers blockchain courses in Pakistan?
A) NUST
B) Punjab University
C) FAST-NU
D) All of the above
✔️ Answer: D -
Which layer is Ethereum’s scaling solution?
A) Layer 0
B) Layer 1
C) Layer 2
D) Layer 3
✔️ Answer: C -
Which of the following is a blockchain-based voting system?
A) DigiVote
B) E-Vote
C) FollowMyVote
D) iVote
✔️ Answer: C -
Future of blockchain is focused on:
A) Decentralization
B) Centralized finance
C) Power banks
D) Manual accounting
✔️ Answer: A
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