Which of the following is a limitation of blockchain technology?

Scalability issues due to slow transaction processing speed

What is a major challenge faced by blockchain regarding energy consumption?

High electricity usage due to mining processes

What does "immutability" mean in blockchain technology?

Data cannot be altered or deleted once recorded

What is the key feature of a decentralized application (dApp)?

It relies on blockchain technology for operation and data storage

What is a "token" in blockchain terminology?

A type of cryptocurrency or asset represented on the blockchain

Which of the following describes a cryptocurrency "blockchain" architecture?

series of linked blocks contain transaction data , cryptographic proofs

How does Stellar’s consensus mechanism differ from traditional proof-of-work blockchains?

It uses a federated Byzantine agreement protocol

In a cryptocurrency network, what does the "peer-to-peer" (P2P) model refer to?

Nodes interact directly with each other to validate transaction

Which type of organizations does Stellar target for partnerships?

Traditional financial institutions and banks

What is a "wallet" in the context of blockchain?

A digital place to store cryptocurrency

What does a dApp usually rely on for its backend infrastructure?

Blockchain networks and decentralized protocols

How does Stellar facilitate interoperability between different currencies?

By providing a decentralized exchange on the blockchain

What is a key feature of Stellar’s architecture for cross-border payments?

It allows for fast and low-cost transfers between different currencies

What is a "block" in a blockchain?

A set of transactions stored on the blockchain

What does "forking" mean in blockchain?

a) The process of splitting a cryptocurrency into two separate chains

What is a "hash" function in blockchain?

A mathematical function that converts input data into a fixed-size output

What is Ripple primarily designed for?

To facilitate cross-border payments and remittances

What does "mining" in blockchain refer to?

The process of validating transactions and adding them to the blockchain

What is the "constructor" function in Solidity?

A function to initialize contract variables when the contract is deployed

What happens if there is insufficient gas for an Ethereum transaction?

The transaction fails, and the gas used is still consumed

How is the amount of gas required for a transaction determined?

Based on the complexity of the transaction or smart contract execution

Which of the following is a limitation of public blockchains?

Transaction speeds can be slow due to network congestion

Which of the following is a scalability solution for blockchain?

Layer 2 solutions like Lightning Network for Bitcoin

Which of the following is a feature of "Proof of Stake" (PoS)?

Validators are chosen based on the amount of cryptocurrency they hold

What is Solidity primarily used for?

Writing smart contracts on the Ethereum blockchain

What does "permissioned blockchain" mean?

Only authorized participants can validate transactions

What is the purpose of a "smart contract" in blockchain technology?

To create legal agreements that automatically execute

What is "decentralization" in blockchain?

Multiple participants validate transactions and maintain the blockchain

What is the role of "modifier" in Solidity?

To add additional behavior or conditions to functions

What is a "public key" in blockchain terms?

A secret code used to encrypt transactions

What is a cryptocurrency wallet?

A software tool that stores public ,private keys , enables transactions

What is the main purpose of blockchain technology?

To provide a decentralized and secure ledger

What is the primary purpose of the Stellar network?

To facilitate cross-border payments and financial inclusion

What does XRP’s "consensus ledger" mean for Ripple transactions?

It’s a ledger where transactions are validated by trusted nodes in network

What is a cryptocurrency token?

A type of cryptocurrency that represents an asset or utility

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Block chain Concepts and Solidity Programming

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Answers

1
Which of the following is a limitation of blockchain technology?
Centralized control
Limited security
Scalability issues due to slow transaction processing speed
Lack of transparency
2
What is a major challenge faced by blockchain regarding energy consumption?
Blockchain consumes no energy during transaction validation
Blockchain use very little energy compared to traditional financial systems
Blockchain uses only renewable energy sources
High electricity usage due to mining processes
3
What does "immutability" mean in blockchain technology?
Transactions can be reversed easily
Data can be deleted at any time
Only administrators can modify the blockchain
Data cannot be altered or deleted once recorded
4
What is the key feature of a decentralized application (dApp)?
It runs entirely on a centralized server
It relies on blockchain technology for operation and data storage
It requires a third-party intermediary
It can only run on Ethereum
5
Which of the following is NOT a characteristic of a "hot wallet"?
Connected to the internet
Examples include mobile and web wallets
Easy to use for frequent transactions
More secure than cold wallets
6
What is a "token" in blockchain terminology?
A contract that governs blockchain operations
A type of cryptocurrency or asset represented on the blockchain
A special type of wallet used for security
A transaction fee paid to miners
7
Which of the following describes a cryptocurrency "blockchain" architecture?
A centralized server storing financial data
series of linked blocks contain transaction data , cryptographic proofs
A storage system for private keys
A single data structure storing all transaction data
8
Which blockchain is known for implementing smart contracts?
Ripple
Litecoin
Bitcoin
Ethereum
9
How does Stellar’s consensus mechanism differ from traditional proof-of-work blockchains?
It relies on proof-of-stake
It uses mining to validate transactions
It has no consensus mechanism
It uses a federated Byzantine agreement protocol
10
In a cryptocurrency network, what does the "peer-to-peer" (P2P) model refer to?
Transactions are validated by a central server
Users send ,receive payments via central authority
Miners are located in a single location
Nodes interact directly with each other to validate transaction
11
Which type of organizations does Stellar target for partnerships?
Governments and central banks
Traditional financial institutions and banks
Only cryptocurrency exchanges
Only tech startups
12
What is a "wallet" in the context of blockchain?
A digital place to store cryptocurrency
A blockchain miner
A smart contract
A blockchain explorer
13
What does a dApp usually rely on for its backend infrastructure?
Centralized data storage
Blockchain networks and decentralized protocols
Traditional cloud servers
Corporate-controlled databases
14
How does Stellar facilitate interoperability between different currencies?
By requiring all users to adopt a single currency
By using a network of trusted intermediaries
By providing a decentralized exchange on the blockchain
By using a smart contract system for currency exchange
15
What is a key feature of Stellar’s architecture for cross-border payments?
It allows for fast and low-cost transfers between different currencies
It uses a central clearinghouse
It relies on proof-of-work for transaction verification
It requires all participants to own XLM tokens
16
Which blockchain-based platform is primarily used for developing decentralized applications (dApps)?
Ripple
Ethereum
Bitcoin
Cardano
17
What is a "block" in a blockchain?
A program that mines cryptocurrency
A digital contract
A set of transactions stored on the blockchain
A unit of cryptocurrency
18
What does "forking" mean in blockchain?
A mechanism for increasing blockchain security
a) The process of splitting a cryptocurrency into two separate chains
A method of transferring cryptocurrency between wallets
A method for verifying transactions
19
Which of the following is an example of a private blockchain?
Hyperledger
Bitcoin
Ethereum
Litecoin
20
Which cryptocurrency operates on the Bitcoin blockchain?
Bitcoin Cash
Ripple
Litecoin
Ethereum
21
What does "dApp" stand for?
Decentralized Application
Distributed Application Platform
Digital Application Protocol
Decentralized Algorithmic Protocol
22
Which of the following is NOT a benefit of blockchain technology?
Decomputerization
Immutability
Centralized control
Decentralization
23
What is a "hash" function in blockchain?
A type of encryption used to protect data
A method of creating new blocks
A program for creating cryptocurrencies
A mathematical function that converts input data into a fixed-size output
24
What is Ripple primarily designed for?
To facilitate cross-border payments and remittances
To mine cryptocurrency
To provide a decentralized storage solution
To create smart contracts
25
What does "mining" in blockchain refer to?
The process of validating transactions and adding them to the blockchain
The process of creating new cryptocurrencies
The act of storing cryptocurrency in a wallet
The development of new blockchain protocols
26
What is the "constructor" function in Solidity?
A function to transfer gas to users
A function to destroy the contract
A function to initialize contract variables when the contract is deployed
A function to interact with other contracts
27
What happens if there is insufficient gas for an Ethereum transaction?
The transaction is successfully executed but delayed
The transaction fails, and the gas used is still consumed
The transaction will automatically be refunded
The transaction is postponed until enough gas is available
28
What is the purpose of "gas" in the Ethereum blockchain?
To mine cryptocurrency
To pay for transaction fees
To store transactions on the blockchain
To provide security to the blockchain
29
How is the amount of gas required for a transaction determined?
Based on the number of participants in the network
Based on the location of the sender and receiver
Based on the complexity of the transaction or smart contract execution
Based on the value of Ether being sent
30
Which of the following is a limitation of public blockchains?
They provide limited access to participants
They are fully anonymous
Transaction speeds can be slow due to network congestion
They have no transparency
31
Which of the following is a scalability solution for blockchain?
Layer 2 solutions like Lightning Network for Bitcoin
Mining
Storing more blocks on a single node
Proof of Work
32
What type of network is blockchain based on?
Peer-to-peer
Decentralized
Centralized
Hybrid
33
What type of wallet is best for security when storing large amounts of cryptocurrency?
Hardware wallet
Paper wallet
Web wallet
Mobile wallet
34
Which of the following is the native cryptocurrency of the Stellar network?
XLM (Lumens)
Ether
XRP
Bitcoin
35
Which of the following is a core component of a cryptocurrency's architecture?
Centralized ledger
Internet connection
Single point of control
Distributed ledger
36
Which of the following is a feature of "Proof of Stake" (PoS)?
It requires high computational power
Miners must solve complex puzzles
Validators are chosen based on the amount of cryptocurrency they hold
All validators must be geographically near each other
37
What is Solidity primarily used for?
Creating decentralized applications (dApps)
Implementing cryptocurrency mining algorithms
Storing blockchain data
Writing smart contracts on the Ethereum blockchain
38
What does "permissioned blockchain" mean?
a) Anyone can participate in the network without restrictions
Blockchain transactions are completely hidden
The blockchain is open but transactions require special keys
Only authorized participants can validate transactions
39
What is the purpose of a "smart contract" in blockchain technology?
To create legal agreements that automatically execute
To encrypt messages
To store cryptocurrency securely
To verify transactions before they are added to the blockchain
40
What is "decentralization" in blockchain?
A central authority controls all transactions
Only one participant controls the network
Transactions are stored in a central server
Multiple participants validate transactions and maintain the blockchain
41
Which blockchain platform is most commonly used for creating tokens through smart contracts?
Bitcoin
Litecoin
Ethereum
Ripple
42
What is the role of "modifier" in Solidity?
To add additional behavior or conditions to functions
To create new contracts
To store variables
To change the state of a smart contract
43
What is a "public key" in blockchain terms?
A cryptographic key used to verify the authenticity of a transaction
A unique identifier used to access the blockchain
A secret code used to encrypt transactions
A key used to unlock a cryptocurrency wallet
44
What is a cryptocurrency wallet?
A software tool that stores public ,private keys , enables transactions
A physical device for storing coins
A digital account with a cryptocurrency exchange
A centralized server storing all blockchain transactions
45
Which of the following is a common consensus mechanism used in blockchain?
Proof of Work
Proof of Authority
All of the above
Proof of Stake
46
What is the main purpose of blockchain technology?
To create a digital currency
To speed up internet connections
To provide a decentralized and secure ledger
To store cryptocurrency in wallets
47
What is the native cryptocurrency of the Ripple network?
Bitcoin
Litecoin
Ether
XRP
48
What is the primary purpose of the Stellar network?
To mine cryptocurrency at low energy costs
To provide a blockchain for smart contracts
To create decentralized applications
To facilitate cross-border payments and financial inclusion
49
What does XRP’s "consensus ledger" mean for Ripple transactions?
It’s a ledger that requires mining to validate transactions
It’s a ledger that stores transaction data permanently
It’s a ledger where transactions are validated by trusted nodes in network
It’s a ledger that is not open to the public
50
What is a cryptocurrency token?
A type of cryptocurrency that represents an asset or utility
A specific blockchain consensus mechanism
A transaction fee paid to miners
A coin issued by a central bank
51
Which of the following is a common data type in Solidity?
All of the above
Integer
Boolean
String
52
What type of user interface do dApps typically provide?
A centralized interface controlled by administrators
A graphical user interface (GUI) for interacting with blockchain
A simple text-based interface
A command-line interface (CLI) for developers only
53
What is a "51% attack" in blockchain?
attack with majority of nodes in network agree fraud transactn
An attack that results in data corruption
An attack on the cryptocurrency wallet
An attack on the private keys of blockchain participants
54
How is gas used in Ethereum transactions?
It is the primary method of mining
It acts as a reward for miners
It is used to execute smart contracts and validate transactions
It is the cryptocurrency of Ethereum
55
What is the primary function of a private key in a cryptocurrency wallet?
enable transactions by proving ownership of publickey
To store transaction histories
To allow the creation of new cryptocurrencies
To generate new public keys for each transaction
56
What is the main difference between a cryptocurrency coin and a crypto token?
Tokens mined on public blockchains, while coins stored in wallets
Coins used as a medium of exchange, tokens represent assets
Coins created via smart contracts, while tokens are mined
There is no difference
57
Which of the following is NOT a function type in Solidity?
View
Pure
Payable
Change
58
Why do many blockchain systems have limitations in terms of transaction speed and throughput?
Blockchain transactions are too small
Because all transactions must be verified manually
Because blockchain does not use gas
Due to the high security need and consensus rule like POW
59
How does Ripple differ from traditional cryptocurrencies like Bitcoin?
Ripple operates only within one country
Ripple uses a proof-of-stake mechanism
Ripple is completely decentralized
Ripple's transactions are validated by a consensus algorithm, not miners
60
Which of the following is a common framework for building dApps on the Ethereum blockchain?
Truffle
Solidity
Angular
React

Block chain Concepts and Solidity Programming Flashcards | StudBud