Blockchain and its Applications Week 4 Assignment Answers

a. Anwesha has a total of 60 unspent bitcoins from two different transactions with an equal amount of bitcoins each. She sends the entire amount each to Arpita and Ankur from one of the transaction
b. Bobby bought a bike using ‘t’ bitcoins. On delivery, the bitcoins are transferred from his wallet to the shopper’s wallet. Simultaneously, he uses that bitcoins for another purchase
c. Bibhu has 140 unspent bitcoins. He sends the entire amount each to Deepak and Tanmany
d. Deepak and Bibhu each have 70 unspent bitcoins. Both of them transfer 20 bitcoins to each other

Answer: a, b, c

Q3. 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: d. iv, i, iii, ii

Q4. Double spending is reusing digital assets intentionally or inadvertently. True or False?

a. True
b. False

Answer: a. True

Q5. 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: b. False

Q6. What are Bitcoin exchanges available in India:

i. BuyUCoin
ii. ZebPay
iii. WazirX

a. i and ii

b. ii and iii

c. i and iii

d. i, ii and iii
Answer: a, b, c, d

Q7. 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: a. Access control for the participants in the blockchain network

Q8. 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: c. It is open to everyone in the world without permission and licensing requirements

Q9. After a hard fork, the emerging two chains are incompatible. True or False?

a. True
b. False

Answer: a. True

Q10. Bitcoin protocol runs over

i. TCP
ii. UDP
iii. HTTP
iv. HTTPS

a. i, ii, iii

b. i, iv

c. Only i

d. Only ii

Answer: c. Only i

Disclaimer: Chandras EDU does not guarantee the correctness of the answers. These answers are based on the data provided by the NPTEL video lectures, are just for reference, and request students to complete the assignments independently.

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