Previous Year UPSC Questions

Explanation

Statement 1 is incorrect: The series of the International Paper Sizes is based on A0 size whose area is 1 m2. The "A" series employs a binary scaling system, where each subsequent size (A1, A2, A3, etc.) is created by folding the preceding size in half along its longer side. This halving process results in a consistent aspect ratio of 2:1, often approximated as 1.414:1. This ratio ensures that regardless of the size, the paper maintains its rectangular shape.

Statement 2 is incorrect: Each ‘A’ size in the series is half the size of the previous one. A1 is half of A0, A2 is half of A1, and so on. Since A4 is four steps down from A0 (A0, A1, A2, A3, A4), its area is (1/2) * (1/2) * (1/2) * (1/2) = 1/16th of the A0 size.

Explanation

Statement 1 is incorrect: NATO, established in 1949, is a military alliance of North American and European countries, originally focused on collective security during the Cold War. The North Atlantic Cooperation Council (NACC), created in 1991 after the Warsaw Pact’s dissolution, facilitated dialogue between NATO and former Eastern Bloc nations. In 1997, the NACC was replaced by the Euro-Atlantic Partnership Council (EAPC), which continues to promote security cooperation.

Statement 2 is correct: The United States and the United Kingdom were founding members of NATO in 1949, signing the North Atlantic Treaty in Washington, D.C. The treaty established mutual defense, meaning an attack on one member is considered an attack on all. This principle, outlined in Article 5, remains central to NATO’s mission.

Explanation

List-I (Person) List-II (Position/Organization) Nancy Pelosi An American politician who was the 52nd Speaker of the United States House of Representatives, serving from 2007 to 2011 and again from 2019 to 2023. Margaret Chan A Chinese-Canadian physician, who served as the Director-General of the World Health Organization (WHO) Pascal Lamy Born 8 April 1947 is a French political consultant and businessman. He was the Director-General of the World Trade Organization (WTO) Steve Ballmer American businessman and investor who served as chief executive officer of Microsoft from 2000 to 2014

Explanation

Option (1) is correct: The 14th NAM Summit was held in Havana, Cuba, in 2006, uniting member states committed to non-alignment during the Cold War.

Option (2) is incorrect: The 2006 APEC Leaders’ Meeting took place in Hanoi, Vietnam. APEC fosters economic cooperation among 21 Asia-Pacific economies.

Option (3) is correct: The 7th EU-India Summit occurred in Helsinki, Finland, in 2006, focusing on trade, climate change, energy, and security.

Option (4) is incorrect: COP12, the 2006 UN Climate Change Conference, was held in Nairobi, Kenya, emphasizing Kyoto Protocol implementation and global climate cooperation.

Explanation

Michelle Bachelet made history by becoming Chile’s first woman president. She served two terms, from 2006 to 2010 and again from 2014 to 2018.

Explanation

List-I (Company) List-II (Major Area/Product) Chevron Oil company AT&T Telephone and an Internet service provider AMD Drivers and Support for Processors and Graphics (Microprocessor) Enercon GmbH Global Manufacturer of Wind Turbines

Explanation

Pair (a) is correctly matched: William Kennedy Dickson, a Scottish inventor working under the guidance of Thomas Edison, played a crucial role in the development of early motion picture technology. Pair (b) is correctly matched: Charles Babbage, an English mathematician, philosopher, and mechanical engineer, is widely regarded as the "father of the computer." He conceived the idea of a programmable mechanical computer, known as the Analytical Engine, in the 19th century. Babbage’s visionary work paved the way for the development of modern computing. Pair (c) is incorrectly matched: Nicholas Stern, Baron Stern of Brentford, is a British economist renowned for his work on the economics of climate change. His influential report, the Stern Review, published in 2006, highlighted the economic costs of inaction on climate change and emphasized the need for urgent global action. Stern’s work has been instrumental in raising awareness of the economic dimensions of climate change and has influenced policy decisions around the world. He is not associated with construction technology. Pair (d) is correctly matched: Brian Greene is a theoretical physicist and a prominent popularizer of string theory, a theoretical framework in physics that seeks to unify all the fundamental forces of nature. Greene is known for his ability to explain complex scientific concepts in an accessible way to a wider audience through his books, television appearances, and public lectures.

Explanation

Mahatma Gandhi’s first Satyagraha in India was initiated in Champaran, Bihar, in 1917. The farmers were forced to grow indigo under oppressive conditions, often receiving very low prices for their crops, and were subjected to high taxes. Gandhi’s non-violent protest led to an official inquiry, resulting in relief for the farmers and marking a significant victory for the Indian freedom movement. This marked the beginning of his non-violent struggle for social and economic justice in the country.

Explanation

The Jallianwala Bagh massacre (April 13, 1919) was a tragic event where British General Reginald Dyer ordered his troops to fire on a peaceful gathering of unarmed Indians, killing hundreds, in protest associated with the repressive Rowlatt Act. The Act allowed the British government to imprison people without trial, which infringed upon basic civil liberties.

Explanation

The annual range of temperature is the difference between the highest and lowest temperatures recorded in a particular place or region over the course of a year.

Statement 1 is incorrect: The annual range of temperature (the difference between the highest and lowest average monthly temperatures) is generally smaller in the Pacific Ocean compared to the Atlantic Ocean. This is primarily due to the Pacific’s larger size and greater thermal inertia. The vastness of the Pacific allows for more heat absorption and distribution, moderating temperature extremes. Atlantic’s relatively smaller size and its greater contact with Arctic waters leads to more pronounced seasonal temperature variations. Also the Atlantic Ocean is narrower and more enclosed, allowing for greater temperature variability.

Statement 2 is correct: The Northern Hemisphere has a greater annual range of temperature than the Southern Hemisphere. This is primarily due to the larger landmasses in the Northern Hemisphere, which heat up and cool down more quickly compared to the predominantly oceanic Southern Hemisphere. In the Southern Hemisphere, the presence of vast oceans helps stabilize temperatures.