Blockchain Interview Questions and Answer
Categories: BLOCKCHAIN
Ques 1) Name some popular platforms for developing blockchain applications. Ans. Some of the popular platforms for developing blockchain are: a. Ethereum b. Hyperledger Sawtooth c. Quorum d. Ripple e. R3 Corda Ques 2) What do you mean by blocks in the blockchain technology? Ans. A Blockchain consists of a list of records(some or all of the recent transaction). Such records are stored in blocks. Each time a block gets completed, a new block is generated. The block linked with other blocks constitutes a chain of blocks called Blockchain. Each block, after added into the blockchain, will be stored as a permanent database. We cannot delete or reverse any block from the blockchain. Ques 3) Every block of Blockchain consist of what elements? Ans. Every block must include these three things: a. A hash pointer to the previous block b. Timestamp c. List of transactions Ques 4) How can blocks be identified? Ans. Blocks can be identified by their block height and block header hash. Ques 5) Can you modify the data in a block? Ans. No, it's not possible to modify the data in a block. In case any modification is required, you would have to erase the information from all other associated blocks too. Ques 6) Can you remove a complete block from a network? Ans. Yes, it is possible to remove a complete block from a network. There are times when only a specific portion of this online ledger is to be considered. There are default options and filters that can help us do this without making a lot of efforts. Ques 7) What type of records can be kept in the Blockchain? Is there any restriction on the same? Ans. No, it is not possible to give restriction for keeping records in the blockchain approach. We can put any type of data on a blockchain such as Bank records, health records, images, Facebook messages, etc. Some of the common types of records which can be kept in the blockchain are: a. Records of medical transactions b. Transaction processing c. Identity management d. Events related to organizations, e. Management activities Ques 8) Which cryptographic algorithm is used in Blockchain? Ans. Blockchain uses SHA-256 Hashing algorithm. The National Security Agency (NSA) in the USA develop SHA-256 Hashing algorithm.