
Blockchain Basics & Security
Quiz
•
Computers
•
University
•
Practice Problem
•
Medium
DHARANI J
Used 1+ times
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13 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain the concept of decentralization in blockchain technology.
Decentralization in blockchain technology refers to the distribution of control and data across a network of computers, rather than relying on a central authority.
Decentralization in blockchain technology allows for easy manipulation of data by a single entity.
Decentralization in blockchain technology involves a hierarchical structure with one central node.
Decentralization in blockchain technology means all data is stored on a single server.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the key components of a block in a blockchain?
Proof of work, Proof of stake, Consensus algorithm
Block number or height, Nonce, Previous block hash, Timestamp, Merkle root, Data, Block hash
Public key, Private key, Signature
Transaction ID, Block size, Miner reward
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a cryptographic hash function and how is it used in blockchain?
A cryptographic hash function is a tool in blockchain used to compress large amounts of data.
A cryptographic hash function is a method in blockchain that allows for easy retrieval of lost data.
A cryptographic hash function is a mathematical algorithm used in blockchain to secure data by converting it into a unique hash value.
A cryptographic hash function is a type of encryption used in blockchain to hide data from unauthorized users.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Discuss the role of consensus algorithms in blockchain security.
Consensus algorithms slow down transaction processing, making blockchain less secure
Consensus algorithms have no impact on blockchain security
Consensus algorithms are only used for data storage and retrieval, not security
Consensus algorithms ensure agreement among nodes on transaction validity and order, enhancing blockchain security.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a 51% attack and how does it affect blockchain networks?
A 51% attack is a feature designed to improve the efficiency of blockchain networks.
A 51% attack enhances the security of blockchain networks by distributing control evenly among participants.
A 51% attack has no impact on blockchain networks and is purely theoretical.
A 51% attack can compromise the security and integrity of blockchain networks by enabling malicious actors to control the majority of the network's mining power.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which one is not the property of hash functions?
Efficient
Easy to invert
Collision resistant
Avalanche Effect
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In SHA-256, preprocessing phase the message is padded to make its length be a multiple of
256
512
1024
128
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