All Weeks Blockchain Basics Coursera Quiz Answers
Table of Contents
Self Check 01: Blockchain Basics Module 01 Quiz Answers
Q1. Did Bitcoin enable a centralized or a decentralized system for the exchange of value?
- Centralized
- Decentralized
Q2. Validation, Verification, Immutable Recording, and _ lead to Trust and Security.
- Coins
- Algorithms
- Tokens
- Consensus
Q3. Who introduced the digital online cryptocurrency known as Bitcoin?
- Satoshi Nakamoto
- Wei Dai
- Nick Szabo
- Hal Finney
Q4. A blockchain enables peer-to-peer transfer of digital currency without any intermediaries such as banks. True or False?
- True
- False
Self Check 02: Blockchain Basics Module 01 Quiz Answers
Q1. A block in a Blockchain has a header and ___.
- Digital Ledger
- Transactions
- Inputs
- Bitcoins
Q2. What does UTXO stand for?
- Unique Transaction Offer
- Unspent Trade Offer
- Unspent Transaction Xeroxed Output
- Unspent Transaction Output
Q3. A transaction generates new UTXOs for transferring the amount specified in the input UTXOs. True or False?
- False
- True
Q4. Miners are computers that execute __.
- operations defined by users
- operations defined by the blockchain protocol
- operations defined by transactions
Self Check 03: Blockchain Basics Module 01 Quiz Answers
Q1. The algorithm for consensus in the Bitcoin blockchain is called ____protocol.
- Proof of Elapsed Time
- Proof of Work
- Proof of Worth
- Proof of Stake
Q2. Transaction confirmation is independently performed by all miner nodes. True or False?
- False
- True
Q3. Transaction 0 in every block in the bitcoin blockchain .
- is for paying the miner fees.
- does not have any input UTXO.
- is called the coinbase transaction
- All of the above.
Q4. In a public blockchain, a participant can join and leave the blockchain as
and when they wish. True or False?
- True
- False
Module 01: Blockchain Defined – Week 1 Quiz Answers
Q1. What is the genesis block?
Answer: The first block of a Blockchain
Explanation: The genesis block is the very first block in a blockchain, forming the foundation upon which all subsequent blocks are built.
Q2. How many transactions are there in the Genesis block in Bitcoin?
Answer: 1
Explanation: The Bitcoin genesis block contains exactly one transaction, which is the coinbase transaction that rewards the miner with newly minted bitcoins.
Q3. How many transactions are there in the Genesis block in Ethereum (other than the transaction for Miner fee)?
Answer: 0
Explanation: The Ethereum genesis block does not contain regular transactions. It only sets up the initial state of the blockchain.
Q4. What is the hash of the previous block for Bitcoin block #490624?
Answer: (Provide the actual hash copied from the block explorer)
Explanation: The “previous block hash” field links block #490624 to its preceding block, maintaining the integrity of the blockchain structure.
Q5. Which of these fields is present in a Bitcoin block summary?
Answer: Difficulty
Explanation: The difficulty field indicates how challenging it was to mine the block, reflecting the effort required to solve the cryptographic puzzle.
Q6. Where are the transactions recorded in a blockchain?
Answer: On a distributed immutable ledger
Explanation: Blockchain transactions are stored on a distributed ledger that is immutable, ensuring data integrity and decentralization.
Q7. What are UTXOs in a Bitcoin Blockchain?
Answer: These form the inputs and outputs for transactions
Explanation: UTXOs (Unspent Transaction Outputs) represent the balance remaining from a transaction that can be used as inputs in future transactions.
Q8. Blockchain was created to support security and trust in a ___________ environment of the cryptocurrency Bitcoin.
Answer: decentralized trustless
Explanation: Bitcoin’s blockchain operates in a decentralized trustless environment, where trust is established through consensus and cryptographic proof.
Q9. What/Who are miners in a blockchain?
Answer: Computers that validate and process blockchain transactions and solve the cryptographic puzzle to add new blocks
Explanation: Miners perform the critical task of validating transactions and solving cryptographic puzzles to add new blocks to the blockchain, ensuring its security and integrity.
Week 02: Ethereum Blockchain
Quiz 01 Answers
Q1. What allows for the execution of code in the Ethereum Blockchain, enhancing the basic value transfer capability of the Bitcoin Blockchain?
- Ethereum Virtual Machine Proof-of-Work
- Smart Contracts
- Solidity
- Byte-code
Q2. Solidity has data, functions or methods with modifiers, along with getter and setter functions. True or False?
- True
- False
Quiz 02 Answers
Q1. How many types of accounts are on Ethereum?
- 1
- 3
- 2
- 4
Q2. The _ can send transactions for ether transfer or they can send transactions to invoke a smart contract code.
- block headers
- algorithms
- accounts (address)
- blocks
Q3. What is the smallest denomination of cryptocurrency on Ethereum?
- Ether
- Bitcoins
- Wei
- Gas Point
Quiz 03 Answers
Q1. ___ hosts the software needed for transaction initiation, validation, mining, block creation, and smart contract execution.
- EVM
- Ethereum full node
- External Account
- Smart Contract
Q2. _ receive, verify, gather and execute transactions.
- Smart Contracts
- Ethereum Virtual Machine
- Miner nodes
- Light wallets
Q3. Any changes to the value of a state variable in a smart contract are stored on the blockchain. True or False?
- True
- False
Quiz 04 Answers
Q1. GASLIMIT is the actual amount of gas spent at the completion of the Block creation. True or False?
- True
- False
Q2. What are miners who solved the puzzle but didn’t win the block creation called?
- Sisters
- Cousins
- Brothers
- Ommers
Q3. __ is paid fees for the creation of a block.
- Receiver of transactions in the block
- Miner of a block
- All full nodes
- Sender of transactions in the block
Week 03: Algorithms & Techniques
Quiz 01 Answers
Q1. A popular public-private key implementation known as Rivest-Shamir Adelman (RSA) algorithm is used for the Bitcoin and Ethereum Blockchain. True or False?
- True
- False
Q2. For the simple symmetric key example discussed in the lecture, it is easy to derive the “secret” key from the encrypted data. True or False?
- False
- True
Q3. 256 bit ECC key-pair is equivalent in strength to approximately 3072-bit RSA key-pair. Thus ECC is much stronger encryption than RSA method. True or False?
- True
- False
Quiz 02 Answers
Q1. What is one of the requirements of secure hashing function?
- It is an ECC function
- It is a one way function
- It is log function
- It is a secret function
Q2. What type of hash is used when there is a fixed number of items to be hashed, such as the items in a block header, and we are verifying the composite block integrity?
- Complex hash
- Either
- Tree-structured Hash
- Simple Hash
Q3. What type of hash function is used, when there is variable number of items to be hashed, such as the many state changes in a block?
- Simple Hash
- Tree-structured Hash
- Either
- Complex hash
Q4. Keccak 256 is a commonly used algorithm for hash generation in the Ethereum blockchain. True or False?
- False
- True
Quiz 03 Answers
Q1. Digital signing of a transaction/document involves, hashing the content of the document and then __.
- encrypting it with nonce
- rehashing it
- encrypting it with public key
- encrypting it with private key
Q2. In Ethereum, the block hash is the hash of all the elements in the?
- Transaction hash tree
- Block header
- State tree
- Receipt tree
Q3. Merkle tree hash is used for computing hash.
- state root
- transaction root
- receipt root
- all of the above
Q4. Block hash allows for the formation of the chain link by embedding the previous block hash in the current block header. True or False?
- False
- True
Q5. If a participant node tampers with a block, it results in __.
- hash changing
- mismatch of hash values
- the local chain of node rendered in an invalid state
- All of the above
Week 04: Trust Essentials
Quiz 01 Answers
Q1. Trust in a decentralized blockchain is about __.
- validating the transactions and blocks for tamper proofing.
- All of the above
- securing the chain using specific protocols.
- executing and confirming the transactions.
Q2. Miners execute the transactions for Ether transfers but are not responsible for the execution of smart contracts. True or False?
- False
- True
Q3. Proof of work is the __ used by Bitcoin blockchain and Ethereum Byzantium Metropolis blockchain.
- Transaction confirmation
- Consensus Protocol
- Incentive function
- Trust function
Q4. An approach for consensus protocol that is hotly debated among developers of blockchain is
- Proof of Stake
- Proof of Incentive
- Round Robin
- Proof of Age
Quiz 02 Answers
Q1. What happens if more than one miner solves the consensus puzzle very close in time to each other in Ethereum?
- The new block is added to the main chain and not the runner-up chain
- Runner-up miners leave the network.
- Small incentives are given to runner-up blocks
- Small incentives are given to the runner up blocks and the new block is added to the main chain
Q2. Double spending is reusing digital assets intentionally or inadvertently. True or False?
- True
- False
Q3. In Ethereum, a combination of account number and the global nonce is used to address issues regarding double-spending. True or False?
- False
- True
Quiz 03 Answers
Q1. Bootstrapping the new software to the already running processes is known as.
- Scripting
- Soft Forks
- Hashing
- Hard Forks
Q2. After a hard fork, the emerging two chains are incompatible. True or False?
- False
- True
Q3. Bitcoin blockchain implemented a soft fork to realize a __.
- Split into Bitcoin core and Bitcoin cash
- P2SH Peer-to-Shell feature
- P2SH conditional payment script feature
- P2SH payer gossip feature
Next Course Quiz Answers >>
Smart Contracts Course Quiz Answers
All Course Quiz Answers of Blockchain Specialization
Course 03: Decentralized Applications (Dapps)
Course 04: Blockchain Platforms
