# Social Networks | Week 5

**Course Name: Social Networks**

**Course Link: Click Here**

**These are Nptel Social Networks Week 5 Assignment 5 Answers**

**Q1. Which of the following is an invalid value for the two dimensional Schelling model grid?**

a. 1

b. 2

c. 4

d. 9

**Answer: d. 9**

**Q2. Given a triangular network with two positive relationships, When is the network stable?**

a. Never

b. Sometimes

c. Always

d. cannot be inferred

**Answer: b. Sometimes**

**These are Nptel Social Networks Week 5 Assignment 5 Answers**

**Q3. Given the two dimensional grid in Figure 1, comment on the stability of the node in the center for A and B, given threshold t=2.**

a. unstable, unstable

b. unstable, stable

c. stable, unstable

d. stable, stable

**Answer: a. unstable, unstable**

**These are Nptel Social Networks Week 5 Assignment 5 Answers**

**Q4. For a graph with five nodes, what is the maximum number of possible triangles in it?**

a. 10

b. 20

c. 30

d. 40

**Answer: a. 10**

**Q5. Which of the following triangles are unstable?**

a. a and b

b. b and c

c. c and d

d. a and d

**Answer: b. b and c**

**Q6. Can we have a complete signed graph on 4 nodes (K4) and 5 nodes (K5) respectively, each having exactly one unstable triangle respectively?**

a. No, No

b. No, Yes

c. Yes, No

d. Yes, Yes

**Answer: c. Yes, No**

**These are Nptel Social Networks Week 5 Assignment 5 Answers**

**Q7. Select all that is True for a structurally balanced network according to the Balance theorem?**

a. It can be a network with all positive relationships

b. It can be a network of two clusters with all positive relationships across and all negative relationships within cluster

c. It can be a network of two clusters with all positive relationships within and all negative relationships across cluster

d. It can be a network with all negative relationships

**Answer: a, c**

**Q8. Given an unstable triangle with edges (+, +, −), this tends to become stable by transforming to a stable state. Which one of the following is an invalid option for such a stable state?**

a. (+, +, +)

b. (+, −, −)

c. (−, −, +)

d. (−, −, −)

**Answer: a. (+, +, +)**

**These are Nptel Social Networks Week 5 Assignment 5 Answers**

**Q9. A friend’s friend tends to become a friend, and so does an enemy’s enemy. Pick out the reason(s).**

a. Triadic closure

b. Structural balance

c. Social influence

d. Selection

**Answer: a, b**

**Q10. When is a signed triangle said to be unstable?**

a. zero positive edge

b. one positive edge

c. two positive edges

d. all positive edges

**Answer: c, d**

**These are Nptel Social Networks Week 5 Assignment 5 Answers**

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**These are Nptel Social Networks Week 5 Assignment 5 Answers**

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