This set of MCQ(multiple choice questions) focuses on the Blockchain and its application NPTEL week 1 solutions 2025. The focus on Blockchain and its application NPTEL week 1 solutions helps in understanding the core concepts introduced in this course.
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Week 1: Introduction to Blockchain Technology and its Importance
Week 2: Basic Crypto Primitives I – Cryptographic Hash
Week 3: Basic Crypto Primitives II – Digital Signature
Week 4: Evolution of the Blockchain Technology
Week 5: Elements of a Blockchain
Week 6: Blockchain Consensus I – Permissionless Models
Week 7: Blockchain Consensus II – Permissioned Models
Week 8: Smart Contract Hands On I – Ethereum Smart Contracts (Permissionless Model)
Week 9: Smart Contract Hand On II – Hyperledger Fabric (Permissioned Model)
Week 10: Decentralized Identity Management
Week 11: Blockchain Interoperability
Week 12: Blockchain Applications
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Blockchain and its application NPTEL week 1 solutions NPTEL 2025 Week 1 Solutions
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1) b) SHA-256 is a cryptographic hash function widely used in blockchain due to its fixed output size and collision resistance.
2) a) 1 x 2128
3) 1025 years
4) c) Participants may or may not trust each other, as the system ensures integrity using cryptographic protocols and agreement through consensus protocols.
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5) a) 120
6) d) In the distributed ledger of each peer across the network.
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7) c) A small change in the input causes a drastic change in the hash, flipping nearly all the bits.
8) b) A distributed ledger where data is stored across multiple nodes and is immutable.
9) a), b)
10) a) 256 bits
Blockchain and its Applications NPTEL 2023 Week 1 Assignment Solutions
Q1. Which one is true for an ideal decentralized solution for business management?
a) a centralized authority should decide the overall trust
b) Everyone should trust and cooperate with each other
c) No one should trust and cooperate with each other
d) no one should teach other, however they should cooperate
Answer: d)
Q2. Which of the statements below is/are true for successful run of decentralized distributed systems?
a) Network of different players
b) Players must trust each other
c) If they cooperate, the society gets benefitted
d) None of the above
Answer: a, c
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Q3. Where are the transaction logs recorded in a blockchain?
a) Centralized editable database
b) Editable log file
c) On centralized immutable database
d) On append only distributed immutable ledger
Answer: d)
Q4. What are the properties of cryptographic hash function?
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a) It should be deterministic
b) It should be collision free
c) Ability to hide the input message
d) Puzzle friendly
Answer: a), b), c), d)
Q5. For a 512 bit hash function, the attacker needs to compute how many hash operations in order to find two matching outputs in the initial round?
a) 2512
b) 2128
c) 2256
d) 260
Answer: c)
Q6. Which of the following is a correct statement about 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 the hash value
d) one can easily find two different messages with same hash
Answer: c)
Q7. What are the security features of a hash function?
a) Non-deterministic
b) Puzzle-friendly
c) Collision-resistance
d) Preimage-resistance
Answer: b), c), d)
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Q8. SHA-512 hashing algorithm used by bitcoin blockchain to determine the hash of a block. This above statement is true or false.
a) True
b) False
Answer: b)
Q9. For hash computation in SHA-512 what is the size of the block that the message is divided into?
a) 1024
b) 512
c) 256
d) 1248
Answer: a)
Q10.
a) a
b) b
c) c
d) d
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Answer: a)
Previous Year – Blockchain and its Applications NPTEL 2022 Week 1 Assignment Solutions
Q1. What is expected by a decentralized solution for a successful Supply Chain management?
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a) No one should trust each other, however they should cooperate
b) Everyone should trust and cooperate with each other
c) No one should trust and cooperate with each other
d) Trust and cooperation does not matter here
Answer: a) No one should trust each other, however they should cooperate
By completing the Blockchain and its application NPTEL week 1 solutions, you will gain a solid foundation in blockchain technology.
Q2. What does trust mean, in a decentralized blockchain?
a) To secure the chain using specific protocols
b) To validate the transactions and blocks for tamper proofing
c) To execute and confirm the transactions
d) None of the above
Answer: a), b), c)
Q3. Where are the transactions recorded in a blockchain?
a) On a SQL Database
b) On a distributed immutable ledger
c) On a distributed opaque immutable ledger
d) On a centralized immutable ledger
Answer: b) On a distributed immutable ledger
Q4. What is one of the requirements of a secure hashing function?
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a) It is an ECC function
b) It is a one way function
c) It is log function
d) It is a secret function
Answer: b) It is a one way function
Q5. For a 512 bit hash function, the attacker needs to compute how many hash operations in order to find two matching outputs?
a) 1.158 x 1077
b) 1.340 x 10154
c) 3.403 x 1038
d) 2.895 x 1076
Answer: a) 1.158 x 1077
Q6. Which of the following is a correct statement about 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 the hash value
d) one can easily find two different messages with same hash
Answer: c) a small change in the message, impacts the hash value
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Q7. What are the security features of a hash function?
a) Deterministic
b) Puzzle-friendly
c) Collision-resistance
d) Preimage resistance
Incorporating the Blockchain and its application NPTEL week 1 solutions into your studies will prepare you for upcoming challenges.
Answer: a), b), c), d)
Q8. SHA-512 hashing algorithm used by Bitcoin blockchain to determine the hash of a block. This above statement is Ture or False.
a) True
b) False
Answer: b) False
Q9. If a participant node tampers with a block, it results in which action(s).
a) Modification of hash
b) Mismatching of hash values
c) The local chain of node rendered in an invalid state
d) Only the previous block will be in an invalid state
Answer: a), b), c)
Q10. What is the hash value of “swayam” if SHA-256 is used? (case sensitive)
a) 3bb8668bb7a3f9e127d4429d24ca0de0c3247843ccc528d9612d46d6ad699a63
b) 4bb8668bb7a3f9e127d4429d24ca0de0c3247843ccc528d9612d46d6ad699a63
c) 4bb8668bb7a3f9e127d4429d24ca0de0c3247843ccc528d9612d46d6ad699a56
d) 3bb8668bb7a3f9e127d4429d24ca0de0c3247843ccc528d9612d46d6ad699a92
Answer: a)
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