Computer Knowledge

Blockchain Technology Applications

2,564 Questions

Blockchain technology applications questions cover consensus mechanisms, network scalability, smart contracts, and cryptography. This subject is crucial for the computer knowledge section of banking and IBPS exams. Practice these questions to build a strong foundation in emerging technologies.

Blockchain consensus mechanismsCryptocurrency payment systemsSmart contract scalabilityBlockchain energy consumptionNetwork security concerns

Blockchain Technology Applications Questions

Multiple choice

Which of the following is a common type of blockchain attack?

  1. Sybil attack

  2. Phishing attack

  3. Man-in-the-middle attack

  4. DDoS attack
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A Sybil attack is a common type of blockchain attack where an attacker creates multiple fake identities to gain control over the network.

Multiple choice

What is the term used to describe the modification of a transaction after it has been broadcast to the network?

  1. Transaction malleability

  2. Double-spending

  3. Hash collision

  4. Blockchain fork
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transaction malleability refers to the ability of an attacker to modify a transaction after it has been broadcast to the network without changing its cryptographic hash.

Multiple choice

Which of the following is a potential vulnerability in blockchain smart contracts?

  1. Reentrancy attack

  2. Integer overflow

  3. Buffer overflow

  4. Cross-site scripting
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A reentrancy attack is a potential vulnerability in blockchain smart contracts where an attacker can exploit the fact that a function can be called multiple times before its state is updated.

Multiple choice

What is the term used to describe a situation where two or more blocks have the same block height?

  1. Blockchain fork

  2. Double-spending

  3. Hash collision

  4. Transaction malleability
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A blockchain fork occurs when two or more blocks have the same block height, resulting in a temporary split in the blockchain.

Multiple choice

What is the term used to describe the process of verifying the authenticity of a transaction on a blockchain?

  1. Mining

  2. Hashing

  3. Validation

  4. Consensus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Validation is the process of verifying the authenticity of a transaction on a blockchain by checking its cryptographic signature and ensuring that it complies with the rules of the network.

Multiple choice

Which of the following is a potential vulnerability in blockchain consensus protocols?

  1. 51% attack

  2. Sybil attack

  3. Double-spending

  4. Transaction malleability
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A 51% attack is a potential vulnerability in blockchain consensus protocols where an attacker gains control over a majority of the network's hashrate, allowing them to manipulate the blockchain.

Multiple choice

What is the term used to describe a situation where a blockchain network is temporarily split into two or more independent chains?

  1. Blockchain fork

  2. Double-spending

  3. Hash collision

  4. Transaction malleability
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A blockchain fork occurs when a blockchain network is temporarily split into two or more independent chains, resulting in two different versions of the blockchain.

Multiple choice

What is the term used to describe the process of adding a new block to a blockchain?

  1. Mining

  2. Hashing

  3. Validation

  4. Consensus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mining is the process of adding a new block to a blockchain by solving complex mathematical puzzles and verifying transactions.

Multiple choice

Which of the following is a potential vulnerability in blockchain smart contracts?

  1. Reentrancy attack

  2. Integer overflow

  3. Buffer overflow

  4. Cross-site scripting
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Integer overflow is a potential vulnerability in blockchain smart contracts where an integer variable can exceed its maximum value, leading to unexpected behavior.

Multiple choice

What is the term used to describe a situation where two or more transactions are processed in the same block?

  1. Transaction conflict

  2. Double-spending

  3. Hash collision

  4. Blockchain fork
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A transaction conflict occurs when two or more transactions are processed in the same block, resulting in a situation where only one of the transactions can be valid.

Multiple choice

Which of the following is a common mitigation strategy to prevent transaction malleability attacks?

  1. Proof-of-Work

  2. Proof-of-Stake

  3. Byzantine Fault Tolerance

  4. Sharding
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

Hash locking is a common mitigation strategy to prevent transaction malleability attacks by requiring transactions to be hashed before they are broadcast to the network.

Multiple choice

What is the term used to describe the process of reaching an agreement among participants in a blockchain network on the validity of a block?

  1. Mining

  2. Hashing

  3. Validation

  4. Consensus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Consensus is the process of reaching an agreement among participants in a blockchain network on the validity of a block, ensuring that all participants have a consistent view of the blockchain.

Multiple choice

What is the term used to describe the practice of using technology to improve the efficiency and effectiveness of supply chain management and logistics processes?

  1. Supply Chain Digitalization

  2. Logistics Automation

  3. Blockchain in Supply Chain

  4. Internet of Things (IoT) in Supply Chain
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Supply Chain Digitalization encompasses the use of technology to improve various aspects of supply chain management and logistics.

Multiple choice

Which consensus mechanism is primarily used by Bitcoin?

  1. Proof-of-Work

  2. Proof-of-Stake

  3. Delegated Proof-of-Stake

  4. Practical Byzantine Fault Tolerance
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Proof-of-Work is the consensus mechanism employed by Bitcoin, where miners compete to solve complex mathematical puzzles to validate transactions and add new blocks to the blockchain.

Multiple choice

What is the primary purpose of Proof-of-Work in a blockchain network?

  1. Securing the network

  2. Processing transactions

  3. Storing data

  4. Providing scalability
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Proof-of-Work serves as a security mechanism in blockchain networks by requiring miners to expend computational power to validate transactions, making it difficult for malicious actors to attack the network.