Q.1 When a record is on a blockchain, who can access it? - Multiple people simultaneously. - One person at a time. - Only the people involved in the transaction. Q.2 Once records are submitted on a blockchain, can they be altered? Yes – the parties can go back in and alter them at any time. Yes – but only within a certain time frame. No – they cannot be altered. Q.3 Are blockchain fully public? Yes No It depends Q.4 What does the block in the blockchain consist of? Transaction data A Hash point A Timestamp All of these Q.5 What is not a ledger type considered by users in Blockchain? Distributed Ledger Decentralized Ledger Both a and b None of these Q.6 What does a ledger in blockchain does? - Mapping between owner and object - Identification of objects owned - Identification of owners Q.7 How are the blocks linked in Blockchain? Backward to the previous block Forward to the next block Both the options None of the options Q.8 Which of the following is not a property of Permissioned Blockchain? Proof of Stake Low transaction cost Same level access to all participants Trusted environment Q.9 Which of the following characteristics does not let Bitcoin be anonymous? People who use Bitcoin cannot have their transactions traced by anyone Bitcoin addresses are derived from IP addresses All transactions are recorded on a global transparent ledger that can be traced using analytical technologies Bitcoins can be linked to a user’s social security number Q.10 Which of the following is a program that initiates a transaction? - Ordering Service - Fabric Peer - Client Application - Chaincode Q.11 Hyperledger allows which of the following to be plugged? Consensus mechanism Identity mechanism Both the options None of the options Q.12 What is a miner? A type of blockchain An algorithm that predicts the next part of the chain A person doing calculations to verify a transaction Computers that validate and process blockchain transactions Q.13 What are the different types of tokens? Platform Privacy Currency All of the above Q.14 What is a blockchain? - A distributed ledger on a peer to peer network - A type of cryptocurrency - An exchange - A centralized ledger Q.15 What is the purpose of a nonce? Follows nouns A hash function Prevents double spending Sends information to the blockchain network Q.16 What is a genesis block? The first block of a Blockchain A famous block that hardcoded a hash of the Book of Genesis onto the blockchain The first block after each block halving The 2nd transaction of a Blockchain Q.17 What is a hash function? A fork UTXO Takes an input of any length and returns a fixed-length string of numbers and letters Q.18 What is the maximum number of bitcoins that can be created? 16 million 21 million 100 million There is no maximum