Answer: Option B - The role of self-interest in promoting public good

Explanation:

• In The Wealth of Nations, Adam Smith introduced the idea of the "invisible hand," which suggests that individuals pursuing their self-interest unintentionally contribute to the overall economic welfare of society.
• By seeking profit, producers and consumers make decisions that lead to efficient resource allocation, benefiting the public good without deliberate intention.
• This concept underpins the foundation of a free-market economy, where government intervention is minimal.

Answer: Option D - Policies that benefit a country’s economy at the expense of others

Explanation:

• "Beggar-thy-neighbour" economic policies refer to protectionist measures that aim to improve a country's economic conditions by disadvantaging other countries.
• Examples include imposing tariffs, strict import quotas, and engaging in currency devaluation.
• These policies are typically used to protect domestic industries or to make exports cheaper, but they often result in harm to other nations' economies.

Answer: Option C - To create a 3D model of the Milky Way

Explanation:

• The Gaia Telescope mission, launched by the European Space Agency in 2013, aims to create a 3D map of the Milky Way galaxy with exceptional precision.
• Positioned at Lagrange Point 2, it has cataloged over 1.8 billion stars, measuring their positions, distances, motions, and compositions.
• This mission plays a crucial role in advancing our understanding of stellar evolution, dark matter, exoplanets, and the history of our galaxy.

Answer: Option B - Known black holes helping study in astronomy

Explanation:

• Cygnus X-1, Gaia BH1, Gaia BH2, and Gaia BH3 are all known black holes identified in recent astronomical studies.
• Cygnus X-1, one of the most studied black holes, is in the Cygnus constellation.
• Gaia BH1, BH2, and BH3 were identified by the European Space Agency's Gaia mission, providing significant insights into the existence and characteristics of black holes in our galaxy.
• These discoveries help deepen our understanding of black holes and their role in the universe.

Answer: Option C - Create inclusive infrastructure for Divyangjans

Explanation:

• The primary aim of the Sugamya Bharat Abhiyan is to promote inclusive infrastructure by creating accessible built environments for persons with disabilities (Divyangjans).
• It focuses on empaneling accessibility auditors who assess public spaces and infrastructure to ensure they meet the required standards for accessibility.
• The initiative aligns with the government's goal to make India more inclusive by ensuring equal opportunities and better access for Divyangjans across the country.