UPSC 2024 Prelims Questions with Answers

Explanation

Radar (Radio Detection And Ranging) is an electromagnetic sensor used for detecting, locating, tracking, and recognising objects of various kinds at considerable distances. It operates by transmitting electromagnetic energy toward objects, commonly referred to as targets, and observing the echoes returned from them. The targets may be aircraft, ships, spacecraft, automotive vehicles, astronomical bodies, or even birds, insects, and rain. Besides determining the presence, location, and velocity of such objects, radar can sometimes obtain their size and shape as well.

Statement 1 is incorrect: Radar technology is being used in the fight against narcotics, but they are being used for interdiction of suspicious flights/aircraft in countries like Guatemala, Brazil and Bolivia and not directly in the identification of narcotics on passengers or in the aircraft.

Statement 2 is correct: Radars, especially Doppler weather radars, are widely used to track precipitation, storm patterns, and weather conditions.

Statement 3 is correct: Radars, such as avian radars, are used to monitor the movement of birds and other animals, especially for ecological studies and aviation safety.

Explanation

The Metaverse refers to an interoperable network of 3D virtual worlds where users can interact, own virtual assets, and engage in various digital activities. It allows millions of users to access and participate simultaneously, often using technologies like virtual reality (VR), augmented reality (AR), and blockchain. Prominent Applications of the Metaverse:

Gaming & Social Interaction - Immersive experiences on platforms like Horizon Worlds and Roblox. Education & Training - VR based learning, medical simulations, and corporate training. Retail & E-Commerce - Virtual stores by brands like Nike and Gucci. Healthcare - VR therapy, remote surgeries, and medical training. Real Estate & Architecture - 3D virtual property tours and design modeling. Work & Collaboration - Virtual offices and meetings (e.g., Microsoft Mesh). Entertainment & Events - Virtual concerts, movies, and live shows. Finance & Virtual Economy - NFTs, digital assets, and blockchain-based transactions. Industry & Manufacturing - Digital twins and AR for production efficiency. Tourism & Exploration - Virtual travel experiences of historical and cultural sites.

Option (c) is correct: "Metaverse" is the most appropriate because it directly encompasses all three of these key features: interconnected 3D virtual worlds, massive concurrent user access, and crucially, the ability to own and manage virtual property. Examples:

Decentraland: Users can interact, purchase virtual land, develop businesses, and trade NFTs. The Sandbox: A virtual economy where users create, own, and monetize digital assets. Options (a), (b) and (d) are incorrect:

Big Data Analytics refers to the process of analyzing large and complex datasets to uncover patterns, trends, and insights. It utilizes advanced techniques such as machine learning, artificial intelligence (AI), and statistical analysis to extract meaningful information. Examples include Netflix’s recommendation system, Google search algorithms, and customer behavior analysis in e-commerce. Overall, this explanation does not resemble the phrase used in the question statement. Cryptography involves techniques for secure communication and data protection through encryption and decryption methods. It ensures confidentiality, integrity, authentication, and non-repudiation in digital transactions. Cryptographic methods are essential in cybersecurity, digital signatures, blockchain technology, and secure online communications. They are commonly used in applications such as SSL encryption for websites, Bitcoin transactions, and end-to-end encrypted messaging apps like WhatsApp. Virtual Matrix is not a widely recognized term in the domain of 3D interconnected virtual worlds. The word "Matrix" is sometimes associated with simulated realities, as seen in science fiction, such as The Matrix movie. However, it does not specifically refer to an interoperable digital ecosystem like the Metaverse. If used in a technical sense, it might refer to a virtual computing environment or a data organization framework, but it does not describe a user-driven virtual space where individuals can exert property rights over digital assets.

Explanation

Statement 1 is correct: According to the Companies Act, 2013, CSR activities must benefit society at large and not be directed toward the company’s employees or their families. Activities that serve the company’s business interests or are part of its normal operations are also excluded from being considered CSR.

Statement 2 is incorrect: The CSR rules mandate that eligible companies spend at least 2% of their average net profits from the preceding three financial years on CSR activities. This is a clearly defined minimum spending requirement under Section 135 of the Companies Act, 2013.

Explanation

Isotherms are lines connecting places with equal temperatures. The horizontal distribution of temperature is depicted through isothermal maps, with the temperature reduced to sea level to eliminate altitude effects. Isotherms are generally parallel to the latitude. The deviation from this general trend is more pronounced in January than in July, especially in the northern hemisphere.

Statement 1 is correct: In January (winter in the Northern Hemisphere), continents lose heat quickly because land has a lower heat capacity than water. On the other hand, oceans retain heat longer due to their high heat capacity. As a result over continents (which are colder), isotherms shift southward, following the drop in temperature. While over oceans (which are warmer), isotherms shift northward, reflecting the retained warmth. This pattern is clearly visible on isothermal maps of the North Atlantic and Eurasian regions.

Statement 2 is incorrect: The Gulf Stream and the North Atlantic Drift are warm ocean currents, not cold. The Gulf Stream carries warm water from the Gulf of Mexico along the eastern coast of North America, while the North Atlantic Drift, an extension of the Gulf Stream, warms the western coasts of Europe. These warm currents increase temperatures in the North Atlantic region, making the area warmer, not colder. As a result, isotherms bend northward because the ocean is warmer than the surrounding continents, not due to cold currents. Fig.: Isotherms in January

Explanation

Statement 1 is correct: The CDS serves as the Permanent Chairman of the Chiefs of Staff Committee (CoSC), ensuring coordination and integration among the Army, Navy, and Air Force. This role is a key responsibility of the CDS.

Statement 2 is incorrect: The CDS does not have direct military command over the three service chiefs (Chief of Army Staff, Chief of Naval Staff, and Chief of Air Staff). Each Service Chief retains operational command over their respective force. Instead, the CDS acts as a coordinator and advisor to ensure jointness and integration across the services.

Statement 3 is correct: The CDS acts as the principal military advisor to the Defence Minister, specifically on tri-service (joint military) matters, while individual Service Chiefs advise on service-specific issues. This is one of the primary roles of the CDS.

Explanation

In 1998, the Northern Command of the Indian Army launched Operation Sadbhavana to address the challenges posed by terrorism and assist in rebuilding the socioeconomic fabric of Jammu & Kashmir and Ladakh. The Army acts as a facilitator for development projects, identified collaboratively with the state administration and local communities, focusing on village-level initiatives. This operation aims to uplift remote populations by improving infrastructure, education, healthcare, and community development. Through these efforts, Operation Sadbhavana seeks to foster goodwill, empower local communities, and promote their integration into the national mainstream.

Explanation

Correctly matched equivalent rank in the three services of Indian Defence force are given below:

Army Airforce Navy

1. Brigadier Air Commodore Commodore

2. Major General Air Vice Marshal Rear Admiral

3. Major Squadron Leader Lieutenant Commander

4. Lieutenant Colonel Commander Wing Commander

Explanation

Part XX of the Indian Constitution outlines the procedure for amending the Constitution. Article 368, which falls under this part, states that Parliament, in the exercise of its constituent power, may amend any provision of the Constitution through addition, variation, or repeal, following the prescribed procedure. Addition: Introducing new provisions into the Constitution (e.g., Fundamental Duties were incorporated through the 42nd Amendment). Variation: Modifying existing provisions (e.g., the voting age was lowered from 21 to 18 by the 61st Amendment). Repeal: Removing provisions from the Constitution (e.g., Right to Property ceased to be a Fundamental Right after the 44th Amendment).

Explanation

Subrahmanyam Jaishankar, India’s External Affairs Minister, is the author of the books "The India Way: Strategies for an Uncertain World" and "Why Bharat Matters". "The India Way" (2020) explores India’s foreign policy in a rapidly changing global order, emphasizing strategic autonomy and diplomacy. "Why Bharat Matters" (2024) discusses India’s evolving global role, economic progress, and strategic challenges.

Explanation

Garba is a traditional folk dance from Gujarat, per-formed during Navratri to honor Goddess Durga. It is characterized by graceful circular movements, rhythmic claps, and vibrant attire, often accompanied by live music and devotional songs. The dance symbolizes the cyclical nature of life and devotion to the divine. In December 2023, UNESCO inscribed Garba on its Representative List of the Intangible Cultural Heritage of Humanity, recognizing its cultural, spiritual, and artistic significance. Options (a), (b) and (d) are incorrect:

Chhau Dance is a semi-classical Indian dance form that blends elements of martial arts, folk traditions, and storytelling. It is primarily performed in the eastern states of India--Jharkhand, Odisha, and West Bengal--and is often associated with religious themes, mythological narratives, and heroic tales. UNESCO inscribed Chhau Dance in 2010 on its Representative List of the Intangible Cultural Heritage of Humanity. Durga Puja is a grand Hindu festival, primarily celebrated in West Bengal and eastern India, honoring Goddess Durga’s victory over Mahishasura. It is marked by elaborate rituals, artistic pandals, cultural performances, and community feasts. In 2021, UNESCO recognized Durga Puja as an Intangible Cultural Heritage, highlighting its artistic and cultural significance. The festival blends devotion, creativity, and social harmony, attracting millions of devotees and tourists each year. Kumbh Mela is one of the largest religious gatherings in the world, held at four sacred riverbanks in Haridwar, Prayagraj (Allahabad), Nashik, and Ujjain in India. It is celebrated in a 12-year cycle, with the Purna Kumbh occurring every 12 years and the Ardh Kumbh every 6 years. Devotees gather to take a holy dip in the sacred rivers, believing it cleanses them of sins and grants salvation. In 2017, UNESCO inscribed Kumbh Mela on its Representative List of the Intangible Cultural Heritage of Humanity, recognizing its deep spiritual and cultural significance.