# Social Networks | Week 3

**Session: JULY-DEC 2023**

**Course Name: Social Networks**

**Course Link: Click Here**

**These are Nptel Social Networks Week 3 Assignment 3 Answers**

**Q1. Given each node in the following Figure 4 represents an individual, a solid line between the nodes represents the existing friendship and the dotted line represents the formation of a new friendship, Which of the following is the reason for such a friendship?**

Triadic Closure

Membership closure

Focal closure

selection closure

**Answer: Triadic Closure**

**Q3. Choose the correct statement.**

Clustering Coefficient denotes the probability of two nodes to become friends with each other

Triadic Closure phenomenon is rare in all kinds of networks

There is no likelihood for a person to become friend in future if he is not a friend in the present

Acquaintances lead to strong ties

**Answer: Clustering Coefficient denotes the probability of two nodes to become friends with each other**

**Q3. In Girvan Newman Algorithm, Edge G-H get removed after D-E what does this imply?**

G-H has high betweenness than D-E

D-E has high betweenness than G-H

G-H has more shortest paths

Both edge are of same betweenness

**Answer: D-E has high betweenness than G-H**

**These are Nptel Social Networks Week 3 Assignment 3 Answers**

**Q4. Let us consider Node A has strong tie with B and C, Violation of strong Triadic closure takes place when there is ——– edge between two neighbours.**

One

No

One strong

One weak

**Answer: No**

**Q5. Which edge will be removed first based on Girvan Newman method?**

3-7

4-5

4-6

1-2

**Answer: 3-7**

**Q6. The measure of betweenness centrality is based on the**

longest path through node

shortest path through node

longest path between node and high degree node

shortest path between node and high degree node

**Answer: shortest path through node**

**These are Nptel Social Networks Week 3 Assignment 3 Answers**

**Q7. What role/property of social networks is at display here in network K?I. Structural holeII. V2 monopolisesIII. Brokerage**

I and II only

II and III only

I and III only

I, II and III

**Answer: I, II and III**

**Q8. Consider two nodes with P and Q set of friends each, the equation |P∩Q|/|P∪Q|describes the**

Clustering coefficient

Social Capital

Neighbourhood Overlap

Centrality Measure

**Answer: Neighbourhood Overlap**

**Q9. Given that neighbourhood overlap of an edge m is equal to 0. Then m is**

a strong tie

a local bridge

edge with high betweenness

a triad

**Answer: a local bridge**

**These are Nptel Social Networks Week 3 Assignment 3 Answers**

**Q10. What is the embeddedness between the nodes v0 and v2 in the given friendship network?**

0

1

2

3

**Answer: 3**

**These are Nptel Social Networks Week 3 Assignment 3 Answers**

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**Session: JAN-APR 2023**

**Course Name: Social Networks**

**Course Link: Click Here**

**These are Nptel Social Networks Week 3 Assignment 3 Answers**

**Q1. Which of the following algorithm is used to detect communities in a network?**

a. Girvan Newman

b. Page Rank

c. Hits

d. Both Girvan Newman and Page Rank

**Answer: a. Girvan Newman**

**Q2. Identify the mechanism that ensures if two people in a social network have a friend in common, then there is an increased likelihood that they will become friends themselves at some point in the future.**

a. Social Capital

b. Structural hole

c. Triadic closure

d. Neighborhood overlap

**Answer: c. Triadic closure**

**These are Nptel Social Networks Week 3 Assignment 3 Answers**

**Q3. Which of the following is True for the edge AB in Graph H?**

**I. It is a strong tieII. It is a local bridgeIII. It is a weak tie**

a. Only I

b. Both I and II

c. Both II and III

d. I, II and III

**Answer: c. Both II and III**

**These are Nptel Social Networks Week 3 Assignment 3 Answers**

**Q4. Compute the embeddedness of the edge AB in the graph H in Figure 1.**

a. 0

b. 1

c. 3

d. 4

**Answer: a. 0**

**Q5. Find the Neighborhood overlap of of the edge connecting V0 and V2 in the graph P. in Figure 2**

a. 3/5

b. 3/4

c. 1/4

d. 1

**Answer: b. 3/4**

**Q6. Consider a large social network where we have two communities that are connected by only through two nodes P and Q. Apart from being a weak tie, this also exhibits a property called**

a. Social Capital

b. Structural hole

c. Triadic closure

d. Neighborhood overlap

**Answer: b. Structural hole**

**These are Nptel Social Networks Week 3 Assignment 3 Answers**

**Q7. We have a community A supporting a popular hero A and another community B that supports a popular hero B in Facebook, we see that they play an important role that makes the content on Facebook all the more popular. Identify those properties.**

a. Closure

b. less diameter

c. High density

d. Brokerage

**Answer: a, d**

**Q8. Which of the following conditions is ideal for a good community?**

a. ratio of intra-community edges to inter-community edge should be high

b. ratio of intra-community edges to inter-community edge should be low

c. ratio of intra-community edges to inter-community edge should be 1

d. ratio of intra-community edges to inter-community edge should be 0

**Answer: a. ratio of intra-community edges to inter-community edge should be high**

**These are Nptel Social Networks Week 3 Assignment 3 Answers**

**Q9. Pick out the statement that best describes betweenness centrality.**

a. All the shortest paths between the given node and the highest degree node.

b. All the longest paths between the given node and the highest degree node.

c. All the shortest paths that pass through the given node.

d. All the longest paths that pass through the given node.

**Answer: c. All the shortest paths that pass through the given node.**

**Q10. While implementing the Girvan Newman algorithm on a certain graph G, you observe that edge E1 gets removed after edge E2. What can you comment about them?**

a. E1 has higher betweenness than E2

b. E2 has higher betweenness than E1

c. E2 has higher embeddedness than E1

d. E1 has higher embeddedness than E2

**Answer: b. E2 has higher betweenness than E1**

**These are Nptel Social Networks Week 3 Assignment 3 Answers**

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