Q1. What are the features of a hash function?
a. Puzzle-friendly
b. Collision-resistance
C. Deterministic
d. Post image resistance

Answer:- a, b, c

Q2.

Answer:- c

Q3.

Answer:- a

Q4. Which of the statements below is/are true for decentralized distributed systems?
a. Players may or may not trust each other
b. Players must trust each other
c. Central body should govern the communication
d. None of the above

Answer:- a

Q5. Miner nodes only execute new transactions but can not verify previous transaction hash?
a. True
b. False

Answer:- b

Q6. Which of the following is/are true for blockchains?
a. Works based on Push technique
b. Existing data can be deleted easily
c. Tamper-proof
d. None of the above

Answer:- a, c

Q7. Where are the ledger logs stored in a blockchain?
a. On a SQL Database
b. On a central immutable ledger
c. On a metadata table
d. In ledger of each peer

Answer:- d

Q8. Which of the following is an avalanche effect to a cryptographic hash function?
a given the same message the hash function would not return the same hash
b. it is not very difficult to generate the original message from the hash
c. a small change in the message, impacts large change the hash value
d. None of the above

Answer:- c

Q9. Genesis blocks may not contain the
a. First transaction
b. First transaction block
Last transaction block
d. None of the above

Answer:- c

Q10. Which of the below is/are blockchain based app examples?
a. Cross-border payments
b. Supply chain
c. Anti-money laundering tracking system
d. UTXO

Answer:- a, b, c