Question 1

In Ethereum how is the block difficulty determined in Ethereum?

Accepted Answer

A)  The Block Difficulty increases when the time between mined blocks is below 10 seconds, while it decreases when the time is above 20 seconds. 
B)  The Block Difficulty is determined by the Ethereum Committee every fortnight to reflect the average amount of transaction and it cannot be influenced by the network itself. 
C)  The Block Difficulty increases when the time between mined blocks is below 20 seconds, while it decreases when the tie is above 60 seconds. 
A)  The Block Difficulty increases when the time between mined blocks is below 10 seconds, while it decreases when the time is above 20 seconds. 
B)  The Block Difficulty is determined by the Ethereum Committee every fortnight to reflect the average amount of transaction and it cannot be influenced by the network itself. 
C)  The Block Difficulty increases when the time between mined blocks is below 20 seconds, while it decreases when the tie is above 60 seconds.

Question 2

Addresses on a blockchain are derived by a process of hashing _________.

Accepted Answer

A)  Wallet Addresses 
B)  Private Keys 
C)  IP Addresses 
D)  Mac addresses 
E)  Public Keys 
A)  Wallet Addresses 
B)  Private Keys 
C)  IP Addresses 
D)  Mac addresses 
E)  Public Keys

Question 3

You are considering writing smart contracts and there are a few different languages you can consider. (Select two.)

Accepted Answer

A)  Truffle 
B)  Serpent 
C)  Solidity 
D)  Embark 
A)  Truffle 
B)  Serpent 
C)  Solidity 
D)  Embark

Question 4

Composer Modeling Language is an object-oriented modeling language that defines the domain model for a business network definition. The modeling language is saved as a __________ file.

Accepted Answer

A)  .json 
B)  .go 
C)  .txt 
D)  .ico 
E)  .cto 
A)  .json 
B)  .go 
C)  .txt 
D)  .ico 
E)  .cto

Question 5

A Smart Contract is most like which classical programming object?

Accepted Answer

A)  Class 
B)  Variable 
C)  Method 
D)  Function 
A)  Class 
B)  Variable 
C)  Method 
D)  Function

Question 6

Which cryptocurrency is also known as "Smart Money" in the blockchain world?

Accepted Answer

A)  Ether 
B)  BTC 
C)  Monero 
D)  Litecoin 
A)  Ether 
B)  BTC 
C)  Monero 
D)  Litecoin

Question 7

Vitalik Buterin referred to this concept of trust beyond just currency as 'smart contracts' or even blockchain-based "decentralized autonomous organizations" (DAOs). Ethereum is considered Blockchain version?

Accepted Answer

A)  2.0 
B)  4.0 
C)  3.0 
D)  1.0 
A)  2.0 
B)  4.0 
C)  3.0 
D)  1.0

Question 8

In regard to blockchain, complete autonomy, transparency, and decentralization:

Accepted Answer

A)  Are the aim of all distributed banking and financial institutions 
B)  Will never be achievable due to technology limitations 
C)  Are highly valuable in some use cases and completely undesirable in other use cases 
D)  Are the foundation principles that allow blockchain to operate successfully 
A)  Are the aim of all distributed banking and financial institutions 
B)  Will never be achievable due to technology limitations 
C)  Are highly valuable in some use cases and completely undesirable in other use cases 
D)  Are the foundation principles that allow blockchain to operate successfully

Question 9

The fabric framework is implemented on ______programming language. What programming language?

Accepted Answer

A)  Go 
B)  Python 
C)  Node.js 
D)  Java 
E)  JS 
A)  Go 
B)  Python 
C)  Node.js 
D)  Java 
E)  JS

Question 10

Transactions can only be added to a blockchain.

Accepted Answer

A) True 
 B)False

Question 11

The ____________of the tree is the topmost node and hence this tree is represented upside down. The bottommost nodes are called as ________nodes. Each node is simply a cryptographic hash of a transaction.   In the above diagram, Transaction A,B, C,C from the leaves of the tree. Select one.

Accepted Answer

A)  Root, Hash 
B)  Root, Leaf Nodes 
C)  Has, Root nodes 
D)  Leaf nodes, Root 
E)  Leaf Nodes, Root 
A)  Root, Hash 
B)  Root, Leaf Nodes 
C)  Has, Root nodes 
D)  Leaf nodes, Root 
E)  Leaf Nodes, Root

Question 12

Bitcoin uses what proof of work consensus system?

Accepted Answer

A)  Cubehash512 
B)  Scrypt-Jane 
C)  Whirlpool 
D)  Scrypt-n 
E)  Hashcash 
A)  Cubehash512 
B)  Scrypt-Jane 
C)  Whirlpool 
D)  Scrypt-n 
E)  Hashcash

Question 13

Which one of the following is true regarding Smart Contracts on the Ethereum blockchain?

Accepted Answer

A)  They provide added security over off-chain transaction code on other blockchain networks 
B)  Because they are compiled into bytecode they cannot be used in an unintended manner 
C)  Any flaw discovered in their code can quickly be updated and redeployed 
D)  They are Turing complete and deterministic in nature 
A)  They provide added security over off-chain transaction code on other blockchain networks 
B)  Because they are compiled into bytecode they cannot be used in an unintended manner 
C)  Any flaw discovered in their code can quickly be updated and redeployed 
D)  They are Turing complete and deterministic in nature

Question 14

Consider the following scenario: A solo app developer wants to create their own cryptocurrency and build a blockchain based that allows users to buy and sell second-hand items with that cryptocurrency from each other. Before the transaction is considered complete, the purchaser must put the funds in an escrow service and the sender must enter the courier tracking number into that same escrow. Time is of the essence and this developer doesn't want to worry about networking of infrastructure. This app must be fully autonomous or "decentralized". Which architecture would best solve the product need?

Accepted Answer

A)  Ethereum for token creation and escrow service; User-facing features built with web technologies and deployed through IPFS 
B)  Ethereum for token creation; Traditional multitier API and database for escrow service; User-facing features built in web technologies then minified unto a String and deployed to an Ethereum Smart Contract 
C)  Hyperledger Fabric for the escrow service and token creation using chaincode; User-facing features built with Hyperledger Composer 
D)  The product cannot be built. Fully decentralized apps are not yet possible for user interface 
A)  Ethereum for token creation and escrow service; User-facing features built with web technologies and deployed through IPFS 
B)  Ethereum for token creation; Traditional multitier API and database for escrow service; User-facing features built in web technologies then minified unto a String and deployed to an Ethereum Smart Contract 
C)  Hyperledger Fabric for the escrow service and token creation using chaincode; User-facing features built with Hyperledger Composer 
D)  The product cannot be built. Fully decentralized apps are not yet possible for user interface

Question 15

What is the difference in using Go-Ethereum over Ganache?

Accepted Answer

A)  Can automate builds with Go Ethereum but you can't with Ganache 
B)  Go Ethereum is written in Java whereas Ganache is written in Golang 
C)  Go Ethereum is real blockchain whereas Ganache is a blockchain simulation 
D)  Ganache is a real blockchain whereas Go Ethereum is a blockchain simulation 
A)  Can automate builds with Go Ethereum but you can't with Ganache 
B)  Go Ethereum is written in Java whereas Ganache is written in Golang 
C)  Go Ethereum is real blockchain whereas Ganache is a blockchain simulation 
D)  Ganache is a real blockchain whereas Go Ethereum is a blockchain simulation

Question 16

What are two challenges with using a Proof of Work algorithm? (Select two.)

Accepted Answer

A)  Mining pools not allowed 
B)  Difficulty rate goes done every year. 
C)  Expensive 
D)  Power Intensive 
A)  Mining pools not allowed 
B)  Difficulty rate goes done every year. 
C)  Expensive 
D)  Power Intensive

Question 17

What are some likely repercussions that could occur as a result of a 51% attack to the Bitcoin network? (Select three.)

Accepted Answer

A)  Unplanned Fork 
B)  Double Spending 
C)  Cancelling Transactions 
D)  Planned Fork 
E)  Selfless Mining 
A)  Unplanned Fork 
B)  Double Spending 
C)  Cancelling Transactions 
D)  Planned Fork 
E)  Selfless Mining

Question 18

In Ethereum a block contains two very important parameters. (Select two.)

Accepted Answer

A)  Difficulty 
B)  Release date 
C)  Block number 
D)  Timestamp 
A)  Difficulty 
B)  Release date 
C)  Block number 
D)  Timestamp

Question 19

The "Nothing-at-Stake" problem that could be realized by Proof of Stake networks would be caused by what?

Accepted Answer

A)  If all of the validator nodes are taken offline 
B)  If validator nodes reject all transactions 
C)  Validator nodes approving all transactions on old and new software after a hard fork occurs 
D)  All of the above 
A)  If all of the validator nodes are taken offline 
B)  If validator nodes reject all transactions 
C)  Validator nodes approving all transactions on old and new software after a hard fork occurs 
D)  All of the above

Question 20

Adding more nodes to a blockchain network has which effect?

Accepted Answer

A)  Increased centralization 
B)  Increased security 
C)  Decreased costs 
D)  Increased performance 
A)  Increased centralization 
B)  Increased security 
C)  Decreased costs 
D)  Increased performance

In Ethereum how is the block difficulty determined in Ethereum?

Addresses on a blockchain are derived by a process of hashing _________.

You are considering writing smart contracts and there are a few different languages you can consider. (Select two.)

Composer Modeling Language is an object-oriented modeling language that defines the domain model for a business network definition. The modeling language is saved as a __________ file.

A Smart Contract is most like which classical programming object?

Which cryptocurrency is also known as "Smart Money" in the blockchain world?

Vitalik Buterin referred to this concept of trust beyond just currency as 'smart contracts' or even blockchain-based "decentralized autonomous organizations" (DAOs). Ethereum is considered Blockchain version?

In regard to blockchain, complete autonomy, transparency, and decentralization:

The fabric framework is implemented on ______programming language. What programming language?

Transactions can only be added to a blockchain.

The ____of the tree is the topmost node and hence this tree is represented upside down. The bottommost nodes are called as nodes. Each node is simply a cryptographic hash of a transaction. In the above diagram, Transaction A,B, C,C from the leaves of the tree. Select one.

Bitcoin uses what proof of work consensus system?

Which one of the following is true regarding Smart Contracts on the Ethereum blockchain?

What is the difference in using Go-Ethereum over Ganache?

What are two challenges with using a Proof of Work algorithm? (Select two.)

What are some likely repercussions that could occur as a result of a 51% attack to the Bitcoin network? (Select three.)

In Ethereum a block contains two very important parameters. (Select two.)

The "Nothing-at-Stake" problem that could be realized by Proof of Stake networks would be caused by what?

Adding more nodes to a blockchain network has which effect?

Certified Blockchain Business Foundations

BTA Certified Blockchain Developer - Ethereum

BTA Certified Blockchain Developer - Hyperledger

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Exam 4: BTA Certified Blockchain Solution Architect

In Ethereum how is the block difficulty determined in Ethereum?

Addresses on a blockchain are derived by a process of hashing _________.

You are considering writing smart contracts and there are a few different languages you can consider. (Select two.)

Composer Modeling Language is an object-oriented modeling language that defines the domain model for a business network definition. The modeling language is saved as a __________ file.

A Smart Contract is most like which classical programming object?

Which cryptocurrency is also known as "Smart Money" in the blockchain world?

Vitalik Buterin referred to this concept of trust beyond just currency as 'smart contracts' or even blockchain-based "decentralized autonomous organizations" (DAOs). Ethereum is considered Blockchain version?

In regard to blockchain, complete autonomy, transparency, and decentralization:

The fabric framework is implemented on ______programming language. What programming language?

Transactions can only be added to a blockchain.

The ____________of the tree is the topmost node and hence this tree is represented upside down. The bottommost nodes are called as ________nodes. Each node is simply a cryptographic hash of a transaction. In the above diagram, Transaction A,B, C,C from the leaves of the tree. Select one.

Bitcoin uses what proof of work consensus system?

Which one of the following is true regarding Smart Contracts on the Ethereum blockchain?

What is the difference in using Go-Ethereum over Ganache?

What are two challenges with using a Proof of Work algorithm? (Select two.)

What are some likely repercussions that could occur as a result of a 51% attack to the Bitcoin network? (Select three.)

In Ethereum a block contains two very important parameters. (Select two.)

The "Nothing-at-Stake" problem that could be realized by Proof of Stake networks would be caused by what?

Adding more nodes to a blockchain network has which effect?

Certified Blockchain Business Foundations

BTA Certified Blockchain Developer - Ethereum

BTA Certified Blockchain Developer - Hyperledger

Filters

The ____of the tree is the topmost node and hence this tree is represented upside down. The bottommost nodes are called as nodes. Each node is simply a cryptographic hash of a transaction. In the above diagram, Transaction A,B, C,C from the leaves of the tree. Select one.