DAILY CURRENT AFFAIRS IAS | UPSC Prelims and Mains Exam – 1st November 2023
Archives (PRELIMS & MAINS Focus) Cloud seeding Syllabus UPSC Prelims – GEOGRAPHY UPSC Prelims – Science & Technology Context: Recently, IITM Pune demonstrated that cloud seeding can produce rainfall. Background:- A cloud seeding experiment was carried out in Solapur city, which falls on the leeward side of the Western Ghats. About Cloud seeding:- IMAGE SOURCE: IASBABA Cloud seeding is a kind of weather modification technology to create artificial rainfall. The goal of this work is to change the amount of precipitation that falls from the sky or to alter the type that would reach the ground. Mechanism:- It is a way of changing the amount or type of precipitation that falls from clouds, by dispersing substances into the air that serve as cloud condensation. Drones are charged into the clouds and cause an electric shock due to which they clump together and cause rainfall. Silver iodide, dry ice, and potassium iodide are the most common items used to initiate the cloud-seeding process. Types:- There are three cloud seeding methods: static, dynamic and hygroscopic. Static cloud seeding: involves spreading a chemical like silver iodide into clouds. Dynamic cloud seeding: aims to boost vertical air currents, which encourages more water to pass through the clouds, translating into more rain. Hygroscopic cloud seeding: disperses salts through flares or explosives in the lower portions of clouds. Advantages of Cloud Seeding:- Cloud seeding can help to produce more precipitation. (Cloudbursts) It can make the land more suitable for living. It helps to regulate weather patterns in specific locations. Disadvantages of Cloud Seeding:- Specific atmospheric conditions must exist for cloud seeding to work: It works only when there are enough pre-existing clouds in the atmosphere. The effectiveness of cloud seeding is still under review. It is an expensive venture. MUST READ: Cloud Wars SOURCE: THE HINDU PREVIOUS YEAR QUESTIONS Q.1) In the northern hemisphere, the longest day of the year normally occurs on the: (2022) The first half of the month of June The second half of the month of June The first half of the month of July The second half of the month of July Q.2) On 21st June, the Sun (2019) does not set below the horizon at the Arctic Circle does not set below the horizon at the Antarctic Circle shines vertically overhead at noon on the Equator shines vertically overhead at the Tropic of Capricorn Carbon nano florets Syllabus UPSC Prelims –SCIENCE AND TECHNOLOGY Context: Recently, IIT Bombay researchers discovered that Carbon nanoflorets can convert incident sunlight to heat . Background:- Carbon nanoflorets made by IIT Bombay researchers can convert incident sunlight to heat with 87% efficiency. About Carbon nanoflorets:- Carbon nanoflorets are like tiny marigold flowers made only of carbon. They have an unprecedented ability to absorb sunlight at multiple frequencies and convert it into heat with exceptional efficiency. The carbon nanoflorets’ high efficiency comes from three properties:- They can absorb infrared, visible, and ultraviolet light, unlike traditional solar-thermal conversion materials that only absorb visible and ultraviolet light. As light falls on the material, the carbon cones ensure that very little is reflected back. Parts of the structure at some distance from each other possess different physical properties. As a result, heat waves in the material aren’t carried over long distances, reducing the amount of heat dissipated away. Making:- To create the carbon nanoflorets, the DFNS powder was heated in a furnace and introduced acetylene gas into the chamber. The white powder turned black, indicating that carbon had been deposited on the DFNS. After dissolving the DFNS with a strong chemical, what remained were spherical nanostructures made of carbon cones. The nanoflorets resemble tiny marigold flowers. Advantages:- Carbon is inexpensive and the nanoflorets can generate heat sustainably, without having to burn fossil fuels. (Carbon Trading) They can offer a sustainable solution for heating homes. They offer sterilizing surfaces in hospitals without relying on fossil fuels. (Climate Change) MUST READ: Mitigating Climate Change SOURCE: THE HINDU PREVIOUS YEAR QUESTIONS Q.1) Which of the following are the reasons/factors for exposure to benzene pollution? (2020) Automobile exhaust Tobacco smoke Woodburning Using varnished wooden furniture Using products made of polyurethane Select the correct answer using the code given below: 1, 2 and 3 only 2 and 4 only 1, 3 and 4 only 1, 2, 3, 4 and 5 Q.2) With reference to ‘fuel cells’ in which hydrogen-rich fuel and oxygen are used to generate electricity, consider the following statements : (2015) If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products. Fuel cells can be used for powering buildings and not for small devices like laptop computers. Fuel cells produce electricity in the form of Alternating Current (AC). Which of the statements given above is/are correct? 1 only 2 and 3 only 1 and 3 only 1, 2 and 3 Rashtriya Vigyan Puraskar Syllabus UPSC Prelims –IMPORTANT AWARDS UPSC Prelims – Polity Context: Recently, the Union government instituted the Rashtriya Vigyan Puraskar. About Rashtriya Vigyan Puraskar:- Rashtriya Vigyan Puraskar includes 56 prizes to felicitate scientists, technologists and innovators. The 56 proposed awards are a stark reduction from the almost 300 science prizes that used to be given by Union Ministries. The awards will commence in 2024. The awards will be announced annually on May 11, which is National Technology Day. They will be awarded on National Space Day, August 23. They will be given by the President or the Vice President. Eligibility:- Scientists/ technologists/innovators working in government, private sector organizations or any individual working outside any organization, who have made distinguished contributions in terms of path-breaking research or innovation or discovery in any field of science, technology, or technology-led- led innovation shall be eligible for the awards. People of Indian Origin staying abroad with exceptional contributions benefiting the Indian communities or society shall also be eligible for the awards. Categories:- Categories: 3 Vigyan Ratna, 25 Vigyan Shri, 25 Vigyan Yuva–Shanti Swarup Bhatnagar, and 3 Vigyan Team. Vigyan Ratna: will recognize the lifetime achievement of scientists.
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