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UPSC 2018 Prelims paper 1
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Ashish Singh
IB ACIO II- 2017(Mains Qualified), Verified Exam cleared- SSC CPO (2014), SSC CGL Tier (2016 - Qualified for Mains), DSSSB (Mains)

U
Unacademy user
He is the best educator not only in the world but in the universe .... His ability and determination of getting best or nothing motivated me to a large extent.... Live long forever and always try to spread quality education among your learners...... RITVIK SHUKLA.. WANT TO BE A CEO OF GOOGLE...... This is my hope😊😊😊😊👌👌👌
Sachin Rana
a year ago
Thank you so much ;)
it is Good Sir.. will we continue to discuss all questions of 2018. Further pls advise if you would be uploading mcqs which you used to do everyday weekend. thank you Sir lots for these lessons
  1. UPSC Prelims Solved Paper-1 2018 By - Ashish Singh


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  3. Why is a plant called Prosopis juliflora often mentioned in news? 1. a. Its extract is widely used in cosmetics b. It tends to reduce the biodiversity in the area in which it grows Its extract is used in the synthesis of pesticides None of the above c. d.


  4. his plant is a native of Mexico, and spread throughout India It's an aggressive colonizer common weed of wastelands, scrublands and dearaded forests. What is biodiversity? Plants Animals ler Shede Food Feod Food & Cash Crops Farm Animals Intercropping . Since it's mention under the . So it's reduce biodiversity in the e Hence option (B) Fruite Medicine head of invasive alien species Binds area Trees Kitchen Crops Insects



  5. 2. Consider the following statements 1. Most of the world's coral reefs are in tropical waters 2. More than one-third of the world's coral reefs are located in the territories of Australia, Indonesia and Philippines 3. Coral reefs host far more number of animal phyla than those hosted by tropical rainforests Which of the statements given above is/are correct? a. 1 and 2 only b. 3 only c. 1 and 3 only d. 1, 2 and 3


  6. Coral reefs are found in tropical and subtropical regions Most of them are located between Tropics of Capricorn and Cancer So yes #1 is indeed right. According to UNEP, % of world area covered by each region: Indonesia 18%, Australia: 17% and Philippines 9% so collectively that'll be more than 33% Hence #2 is right Coral reefs include a wide range of diversity with 32 of the 34 animal phyla present, in contrast to only 9 phyla represented in tropical rainforest So, #3 is also right. T hus answer IS D:



  7. 3. With reference to solar power production in India, consider the following 1. 2. The solar power tariffs are determined by the solar Energy Corporation statements India is the third largest in the world in the manufacture of silicon wafers used in photovoltaic units of India Which of the statements given above is/are correct? a. 1 only b. 2 only c. Both 1 and 2 d. Neither 1 and 2


  8. There is no significant production of silicon wafers in India So unlikely that it became 3rd largest by 2017-18 So, #1 is wrong. Tariffs are determined under the Electricity Act. The Ministry of New and Renewable Energy (MNRE) has issued a clarification that calls for procuring power fronm small solar and wind projects through feed-in tariffs determined by their respective State Electricity Regulatory Commissions (SERCs) So, #2 wrong . . . How Value Additlon Works out Cost of one sillcon wafer What's So Special? 1con saverygoodmaterial tofor transistorsworkingatless than400volts Galllum nitride transistors workwell between 400 and 900 volts Many modern products such as converters workat 400-900 voits Galllum nitride transistors are faster than sllicon and occupy less space Gallium nltride Isalso useful in wireless devices llke radar Cost of one sillcon wafer after gallium nitride deposition 2-3 lakh Cost of thewafer with the power devices embedded . 50 lakh or above


  9. 4. Which of the following statements best describes "carbon fertilization"? a. Increased plant growth due to increased concentration of carbon b. Increased temperature of Earth due to increased concentration of c. Increased acidity of oceans as a result of increased concentration d. Adaptation of all living beings on Earth to the climate change dioxide in the atmosphere carbon dioxide in the atmosphere of carbon dioxide in the atmosphere brought about by the increased concentration of carbon dioxide in the atmosphere


  10. The CO2 fertilization effect or carbon fertilization effect is the increased the (a rate of photosynthesis in plants that results from increased levels of carbon dioxide in the atmosphere. The CO2 and the absorbant are piped to a regenerator, which removes the absorbant and returns it to the system .The effect varies depending on the plant species, the temperature, and the availability of water and nutrients. Studies have shown that increased concentration of carbon dioxide increase photosynthesis, spurring plant growth 500m Impermeable cap-rock 1,000m .Results showed that carbon Played-out oil field dioxide fertilization explains 70% of the greening effect. (NASA 2016) 1,500m Oil field


  11. . Scientists are suggesting that | We in the Mid Of a Sixth Mass Extinction? sixth mass extinction is underway as there is a A Tally of Life Under Threat The Intemational Union for Conservation of Nature has evaluated 52 205 species, depicted here, for their ability to survive. Related Artice species loss of 100-1000 | X425,-Drup Each symbol represents 100 species assessed THREATENE NOT THREATENE every year. MAMMALS 86% of known soeces assessed 3448 not threatened 99% of known species assessed 8,401 not threatened . The normal backaround extinction rate is about 10-25 species per year. Habitat loss, over-harvesting4 253 threstened ,138 tireatened 13% 25% Stark Indicators Of Extinction Risks and invasive species invasion 70% assessed 2.767 not threatened Because most known species of birds mammals and amphibians have been evaluated, scientists are conident about the percentage of each group that is threatened 117 threatened


  12. Mammalia Timeline of Life on Earth Aves 14 Repilia29 Amphibia 1 Actinopterygii 21 )@28" Scleractinia 0 Gastropoda | ?<p118p 1 Oldest bacteria Bacterialreducing fossils Ecosystems bactoria Single- cellalan Cambrian Flowers period Ear Sulphate Multi- Fich Ediacaran reptiles celled eukarytes Higher fauna Methoongenicc Arahaebacteria cukaryote 27 mmals 56* Bivalvia | ? 10 Cycadopsida1 Coniferopsida Chondrichthyes 17 47* 45 4.0 3.5 Oldest 1.0 05 3.0 2.5 2.0 15 0 Earth formedkTime (4.65 bya) Majer extinctions 70% to -90% A29 Oxygen levele incrcos0 Big Five mass extinctions 25 50 Extinction magnitude (percentage of species) 75 100


  13. 7. Which of the following has/have shrunk immensely/dried up in the recent past due to human activities? Select the correct answer using the code below: a. 1 only b. 2 and3 c. 2 only d. 1 and 3


  14. The Aral Sea, in Central Asia, used to be the fourth largest lake in the world, after the Caspian Sea, and Lakes Superior and Victoria Now barely 10% of it is left Lake Baikal's has been crippled by a series of detrimental phenomena They include the disappearance of the omul fish, rapid growth of putrid algae and the death of endemic species of sponges across its vast 3.2 million-hectare area (The Hindu Oct 2017), . . . But there is no mention of immensely drying up Hence answer is a


  15. 8. How is the National Green Tribunal (NGT) different from the Central Pollution Control Board 1. The NGT has been established by an Act whereas the CPCB has been created by an executive order of the Government The NGT provides environmental justice and helps reduce the burden of litigation in the higher courts whereas the CPCB promotes cleanliness of streams and wells, and aims to improve the quality of air in the country. 2. Which of the statements given is/are correct a. 1 only b. 2 only c. Both d. None


  16. .Baigas are considered as a particular vulnerable tribal group (PVTG) in the Indian Constitution and rely mostly on shifting cultivation, forest produce and fishing for cultivation, forest produce and fishing for sustenance, spread produce and fishing for sustenance, spread over forested areas of Madhya Pradhesh and Chhattisgarh .In 2016, they became India's first community to get habitat rights. (Downt Earth-2016. So, #2 is right) Under FRA Act, district level Committees have to adjudicate the rights, whereas Tribal ministry only issues guidelines That makes #3 wrong /irrelevant. By elimination, we are left with A Only 1 and 2 .


  17. . "Pakhui/Pakke Tiger reserve" is in Arunachal Pradesh, so if there is a wildlife sanctuary in Pakhui, it should be in "A" for Arunachal Pradhesh