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Social Networks | Week 10

2 months ago
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4 minutes

Course Name: Social Networks

Course Link: Click Here

These are Nptel Social Networks Week 10 Assignment 10 Answers


Q1. Choose the correct option based on the given statements. Statement I – A disease’s spread depends on whether the network is sparsely connected or densely. Statement II – A disease’s spread depends on its degree of contagiousness.
a. I only is True
b. II only is True
c. Both are True
d. None is True

Answer: c. Both are True


Q2. Consider the following network D where node A if infected with a disease and the probability of spreading a disease from node A to its connected nodes is 0.6. If the disease starts spreading from node A, then the expected number of nodes with the disease is

image 15

a. 2
b. 3
c. 4
d. 5

Answer: c. 4


These are Nptel Social Networks Week 10 Assignment 10 Answers


Q3. Given the reproductive number of an epidemic is R0< 1, Comment about the disease spread in the network.
a. The disease dies out with a positive probability
b. The disease persists with a positive probability
c. The disease persists forever in the network
d. The disease dies out with probability 1

Answer: a. The disease dies out with a positive probability


These are Nptel Social Networks Week 10 Assignment 10 Answers


Q4. Consider a disease ‘X’. People who are diagnosed in the earlier stage have high chance of recovery. But the intense infection of ‘X’ will lead to death. The recovered people do not have a chance to get infected again. What kind of model does this disease ‘X’ exhibit?
a. SIS
b. SIR
c. Both
d. None

Answer: b. SIR


Q5. Suppose the basic reproductive number is estimated to be R0 = 1.5. If a vaccine giving 100% immunity is available next time and a fraction v = 0.3 of randomly selected individuals were vaccinated, an estimate of the new reproductive number would be
a. 1.05
b. 1.1
c. 1.2
d. 1.3

Answer: a. 1.05


Q6. Given that the Reproductive number of an epidemic in action is 1.1. What are valid attempts to curb the disease or reduce the reproductive number?
a. Isolate the infected person so that we reduce the number of people getting infected.
b. Create awareness among the population to follow proper hygiene thereby reducing the probability of the disease spread
c. Avoid visiting public gatherings to reduce contact probability with infected persons
d. All the above

Answer: d. All the above


These are Nptel Social Networks Week 10 Assignment 10 Answers


Q7. In the percolation model, it is possible to find if a node will be infected or not without any notion of time. When can you say that a node ‘A’ is susceptible for infection in a percolation model?
a. If there exists at least one path with all open edges from the infected node to the node ‘A’
b. If there exists at least one path with one open edge from the infected node to the node ‘A’
c. If there exists more than one path with one open edge from the infected node to the node ‘A’
d. If there exists at least one path with all closed edges from the infected node to the node ‘A’

Answer: a. If there exists at least one path with all open edges from the infected node to the node ‘A’


Q8. Which of the following model can run for infinite number of steps in a network?
a. SIR
b. SIS
c. Both
d. None

Answer: a. SIR


These are Nptel Social Networks Week 10 Assignment 10 Answers


Q9. Given the probability of spreading disease is 0.4, what is the probability that the same person does not get infected for the second time?
a. 0.4
b. 0.6
c. 0.8
d. 1

Answer: b. 0.6


These are Nptel Social Networks Week 10 Assignment 10 Answers


Q10. Suppose that a person ‘P1’ gets infected with a contagious disease and transmits it to each person he meets independently with a probability of 0.64. Further, suppose that he comes in contact with 450 people from the population while he is contagious. What is the expected number of secondary infections produced?
a. 450
b. 288
c. 29
d. 64

Answer: b. 288


These are Nptel Social Networks Week 10 Assignment 10 Answers



These are Nptel Social Networks Week 10 Assignment 10 Answers

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These are Nptel Social Networks Week 10 Assignment 10 Answers

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