NPTEL Social Networks Week 4 Assignment Answers 2025
1. Granovetter’s theory of tie strength suggests that:
- Strong ties contribute to the spread of new information across a network.
- Weak ties act as bridges connecting different social clusters.
- Passive engagement is the primary driver of tie formation.
- Weak ties are more emotionally intense than strong ties.
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2. In analyzing passive engagement on social media, which metric best captures a user’s interaction level?
- Frequency of likes and comments
- Time spent scrolling without explicit interaction
- Number of posts shared per day
- Ratio of followers to following
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3. The betweenness centrality of a node v in a graph G is calculated by:
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4. In graph partitioning, the modularity measure is used to evaluate:
- The density of a node’s local neighborhood.
- The quality of a partition based on the ratio of intra-cluster and inter-cluster edges.
- The average degree of nodes in a graph.
- The overall size of the graph.
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5. In a social network graph, strong relationships can be identified using:
- Nodes with the highest degree centrality.
- Nodes connected by edges with high weights representing frequent interactions.
- Nodes with low clustering coefficients.
- Nodes that are part of disjoint communities.
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6. Weak relationships are considered essential in network analysis because:
- They reduce the clustering coefficient of the network.
- They enable diffusion of novel information between clusters.
- They increase the density of the graph.
- They are more stable than strong ties.
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7. The homophily index measures the tendency of individuals to associate with similar others. It is mathematically represented as:
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8. How can social influence be empirically tested in a longitudinal study of social networks?
- By measuring changes in individuals’ behaviors after new connections are formed.
- By calculating clustering coefficients of influential nodes.
- By evaluating the modularity of the network before and after interventions.
- By comparing the degree centrality of nodes over time.
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9. Foci closure in social networks is strongly tied to:
- Shared affiliation to activities or spaces that increase the likelihood of interaction
- Strong ties that persist despite geographic separation.
- Nodes with high betweenness centrality influencing smaller clusters.
- The probability of network rewiring events.
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10. The Fatman Evolutionary Model suggests preferential attachment in networks is driven by:
- The degree of existing nodes and the relative fitness of new nodes.
- Randomized connections that optimize modularity.
- Shortest path distribution across clusters.
- Edge weights that decay exponentially over time.
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