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Blockchain (Computer Science) Solved Questions & Notes (2026) - Apex Rankers

General Competitive Exams > Computer Science > Blockchain

15 Total Solved Questions
~23 mins Estimated Reading Time
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15 Questions in this set
Select the best option for the following modern Computer Aptitude Test questions (covering AI, Cloud, Cybersecurity, and Modern Hardware):
Q. 1 Computer Aptitude Test
Difficulty: Medium (1 Mark)
In blockchain technology, what is a 'ledger'?
A
A physical book
B
A distributed database
✓ Correct
C
A mining tool
D
A crypto wallet
💡 Step-by-Step Explanation & Concept Rationale
A ledger is a decentralized record of all transactions across a network.
Q. 2 Computer Aptitude Test
Difficulty: Medium (1 Mark)
Which of these is a 'stablecoin'?
A
Bitcoin
B
Ethereum
C
USDT
✓ Correct
D
Dogecoin
💡 Step-by-Step Explanation & Concept Rationale
Stablecoins like USDT are pegged to a stable asset like the US Dollar.
Q. 3 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is a 'Smart Contract'?
A
A legal paper
B
Self-executing code
✓ Correct
C
A fast computer
D
An AI lawyer
💡 Step-by-Step Explanation & Concept Rationale
Smart contracts automate agreements without the need for an intermediary.
Q. 4 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Cryptocurrency' mining?
A
Digging for coins
B
Validating transactions
✓ Correct
C
Printing money
D
Hacking wallets
💡 Step-by-Step Explanation & Concept Rationale
Mining involves using computer power to verify and record blockchain transactions.
Q. 5 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is a 'Cold Wallet' in crypto?
A
An icy computer
B
Offline storage for crypto
✓ Correct
C
A hacked wallet
D
A bank account
💡 Step-by-Step Explanation & Concept Rationale
Cold wallets are not connected to the internet, making them safer from hacks.
Q. 6 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'NFT'?
A
New File Type
B
Non-Fungible Token
✓ Correct
C
Network File Transfer
D
Near Field Tech
💡 Step-by-Step Explanation & Concept Rationale
NFTs are unique digital assets verified using blockchain technology.
Q. 7 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Blockchain'?
A
A heavy chain
B
Distributed ledger
✓ Correct
C
A fast hard drive
D
A web browser
💡 Step-by-Step Explanation & Concept Rationale
A decentralized system of recording information that is hard to change.
Q. 8 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What does 'PoS' stand for in modern Blockchain?
A
Point of Sale
B
Proof of Stake
✓ Correct
C
Piece of Software
D
Path of Security
💡 Step-by-Step Explanation & Concept Rationale
PoS is an energy-efficient way for blockchains to reach consensus on transactions.
Q. 9 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is a 'Cold Wallet' in cryptocurrency?
A
A broken wallet
B
Offline storage not connected to internet
✓ Correct
C
A plastic card
D
A bank app
💡 Step-by-Step Explanation & Concept Rationale
Cold wallets are much more secure against hacking compared to "hot" online wallets.
Q. 10 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Blockchain'?
A
A heavy box
B
Distributed, decentralized ledger
C
A secure, transparent system for recording transactions across a network
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Blockchain is the underlying technology for cryptocurrencies like Bitcoin.
Q. 11 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is an 'NFT' (Non-Fungible Token)?
A
New file
B
Unique digital asset verified on blockchain
C
A unique digital identifier that cannot be copied or substituted
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
NFTs are used to represent ownership of digital art, music, and collectibles.
Q. 12 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is a 'Smart Contract'?
A
Legal paper
B
Self-executing code on a blockchain
C
A program that automatically executes an agreement when conditions are met
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Smart contracts remove the need for middlemen in many transactions.
Q. 13 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Stablecoin'?
A
Fast coin
B
Cryptocurrency pegged to a stable asset (like USD)
C
A chain
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
They are used to avoid the high volatility of coins like Bitcoin.
Q. 14 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'DeFi'?
A
Default Link
B
Decentralized Finance
C
Financial services provided on a blockchain without intermediaries
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
DeFi allows for lending and trading without traditional banks.
Q. 15 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is a 'DAO'?
A
Data Array
B
Decentralized Autonomous Organization
C
An organization managed by smart contracts on a blockchain
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
DAOs allow for community-governed projects without centralized leaders.
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