This set of MCQ(multiple choice questions) focuses on the **Social Networks NPTEL Week 1 Assignment Solutions**.

### Course layout

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**Week 0: ****Assignment answers**

Week 1: Introduction

Week 2: **Handling Real-world Network Datasets**

Week 3: **Strength of Weak Ties**

Week 4: **Strong and Weak Relationships (Continued) & Homophily **

Week 5: **Homophily Continued and +Ve / -Ve Relationships**

Week 6: **Link Analysis**

Week 7: **Cascading Behaviour in Networks**

Week 8: **Link Analysis (Continued)**

Week 9: **Power Laws and Rich-Get-Richer Phenomena**

Week 10: **Power law (contd..) and Epidemics**

Week 11: **Small World Phenomenon**

Week 12: Pseudocore (How to go viral on web)

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**Social Networks** NPTEL 2022 Week 1 Assignment Solutions

**Q1.** Let L = [“one”, “two”, [“three”, “four”, “five”, “six”], “seven”, [“eight”], []] be the list. What will be the output of len(L) (written in Python3)?

a) 5

b) 6

c) 8

d) 9

Answer: b) 6

**Q2.** Which of the following functions is used to create a directed graphs with self loops and parallel edges in NetworkX?

a) networkx.MultiDirectedGraph()

b) networkx.Multi_Di_Graph()

c) networkx.MultiDiGraph()

d) networkx.Graph(create_using = ‘Multi Directed’)

Answer: c) networkx.MultiDiGraph()

**Q3.** If string = ‘Mississippi’, what will be the output of string[0:6] (written in Python3)?

a) ‘Missis’

b) ‘Mississ’

c) ‘Mississi’

d) TypeError

Answer: a) ‘Missis’

**Q4.** Total number of possible edges on a graph (undirected and without loops) on n vertices is not:

a) n(n−1)/2

b) n/2

c) 1+2+3+⋅⋅⋅+(n−1)+n

d) 1+2+3+⋅⋅⋅+(n−1)

Answer: c) 1+2+3+⋅⋅⋅+(n−1)+n

**Q5.** If d = {0:’a’, 1:’b’, 2:’c’, 3:’d’} is the dictionary then which among the following codes (written in Python3) would reverse keys and values of d?

a) {v:k for k,v in d.items()}

b) {d[i]:i for i in range(4)}

c) {d[i]:i for i in d}

d) All of the above

Answer: d) All of the above

**Q6.** Let the number of atoms in the explored universe be 10801080. Pick the smallest number of nodes from the below given options such that the number of possible graphs on that many nodes is greater or equal to the number of atoms in the explored universe. (Assume log2log210 = 3.3)

a) 23

b) 24

c) 25

d) 26

Answer: b) 24

**Q7.** What is the output of the following code snippet (written in Python3):

```
import networkx
G = networkx.Graph()
G.add_edges_from([(1, 2), (1, 3), (4, 1), (1, 5)])
G.remove_node(1)
print(len(G.edges()))
```

a) 0

b) 1

c) 2

d) 3

Answer: a) 0

**Q8.** Let t be a tuple (“social”, “networks”, “IIT”). What will be the output of t.append((“Ropar”)), written in Python3?

a) (“social”, “networks”, “IIT”, “Ropar”)

b) (“social”, “networks”, “IIT”, (“Ropar”))

c) (“social”, “networks”, (“IIT”, “Ropar”))

d) Attribute Error

Answer: d) Attribute Error

**Q9.** Which of the following is correct?

(A) A variable name must start with a letter or the underscore character

(B) A variable name can start with a number

(C) A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _)

(D) Variable names are case-sensitive (ropar, Ropar and ROPAR are three different variables)

a) Only A and B

b) Only A, B and C

c) Only B and D

d) Only A, C and D

Answer: d) Only A, C and D

**Q10.** For integers n>1, let Gn be a complete graph on n vertices such that each vertex is labeled by a distinct number 1,2,3,⋅⋅⋅,n, and each edge is labeled by the sum of its endpoint labels. The sum of all the edge labels is:

a) n(n−1)^{2}/2

b) n(n−1)(n+1)/2

c) n(n−1)(n+1)

d) n(n+1)/2

Answer: b) n(n−1)(n+1)/2

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