NPTEL Blockchain and its Applications Assignment 4 Answers:- In this article, we have provided answers of Blockchain and its applications assignment 4
Q1. Double spending is reusing digital assets intentionally or inadvertently. True or False?
a) True
b) False
Q2. In blockchain, cryptography ensures authenticity of a transaction, and also helps prevent double-spend. Is the above statement True or False?
a) True
b) False
Answer:
Q3. Which is/are the examples of the double-spending attack?
a) Anita has a total of 80 unspent bitcoins from two different transactions with an equal amount of bitcoins each. She sends the entire amount each to Deepak and Tanmay from one of the transaction
b) Bibhu bought a car using ‘p’ bitcoins. On delivery, the bitcoins are transferred from his wallet to the shopper’s wallet. Simultaneously, he uses that bitcoins for another purchase
c) Anita and Bibhu each have 40 unspent bitcoins. Both of them transfer 20 bitcoins to each other
d) Bibhu has 40 unspent bitcoins. He sends the entire amount each to Deepak and Tanmany
Answer:
Q4. The primary difference between the permission less and permissioned blockchain is _____________?
a) Access control for the participants in the blockchain network
b) Hash Algorithms
c) Confidentiality
d) Availability
Answer:-
Q5. What is an advantage of a permission less blockchain?
a) It does not use disinterested third parties to secure blocks, as all participants have a vested interest
b) It is more resilient against fraud, because it uses federated nodes to combat fraud
c) It is open to everyone in the world without permission and licensing requirements
d) Its network are built by for-profit companies and the working of the network is guaranteed.
Answer:
Q6. After a hard fork, the emerging two chains are incompatible. True or False?
a) True
b) False
Answer:
Q7. Which transaction(s) is/are valid with the current blockchain?
a) No conflict with other transactions
b) No double spending
c) No infinite loops
d) All of the above
Answer:
Q8. Bitcoin protocol runs over
a) TCP
b) UDP
c) HTTP
d) HTTPS
Answer:
Q9. What is the correct order of adding a new block to blockchain
i. Block Mining
ii. Block propagation
iii. Block Flooding
iv. Transaction Flooding
a) iii, iv, ii, i
b) iv, iii, ii, i
c) ii, i, iii, iv
d) iv, i, iii, ii
Answer:
Q10. What are Bitcoin exchanges available in India:
a) Coinbase
b) CoinDCX
c) UNOCoin
d) CoinSwitch Kuber
Answer:–
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NPTEL Blockchain and its Applications Assignment 4 Answers:- In this article, we have provided answers of Blockchain and its applications assignment 4