UPSC Prelims 2020 Question Paper — GS & CSAT with Answers

UPSC held the 2020 Preliminary examination on 4 October 2020 — GS Paper I from 9:30 to 11:30 am and CSAT from 2:30 to 4:30 pm. 179 questions from that day are below, each with the Commission's official answer and our explanation of why the other three options fail.

General Studies Paper I

99 questions

Economy 28 · History 19 · Polity & Governance 17 · Environment & Ecology 16 · General Science 11 · Geography 5 · Current Events 3

  1. Q1 Consider the following statements : 1. Aadhaar metadata cannot be stored for more than three months. 2. State cannot enter into any contract with private corporations for sharing…
  2. Q2 Rajya Sabha has equal powers with Lok Sabha in
  3. Q3 With reference to the funds under Members of Parliament Local Area Development Scheme (MPLADS), which of the following statements are correct ? 1. MPLADS funds must be used to…
  4. Q4 Which one of the following categories of Fundamental Rights incorporates protection against untouchability as a form of discrimination ?
  5. Q5 In India, separation of judiciary from the executive is enjoined by
  6. Q6 Along with the Budget, the Finance Minister also places other documents before the Parliament which include 'The Macro Economic Framework Statement'. The aforesaid document is…
  7. Q7 A constitutional government by definition is a
  8. Q8 Other than the Fundamental Rights, which of the following parts of the Constitution of India reflect/reflects the principles and provisions of the Universal Declaration of Human…
  9. Q9 In India, Legal Services Authorities provide free legal services to which of the following type of citizens ? 1. Person with an annual income of less than ₹ 1,00,000 2…
  10. Q10 Consider the following pairs : International agreement / set-up — Subject 1. Alma-Ata Declaration — Healthcare of the people 2. Hague Convention — Biological and chemical weapons…
  11. Q11 A Parliamentary System of Government is one in which
  12. Q12 Which part of the Constitution of India declares the ideal of Welfare State ?
  13. Q13 Consider the following statements : 1. The Constitution of India defines its 'basic structure' in terms of federalism, secularism, fundamental rights and democracy. 2. The…
  14. Q14 One common agreement between Gandhism and Marxism is
  15. Q15 In the context of India, which one of the following is the characteristic appropriate for bureaucracy ?
  16. Q16 The Preamble to the Constitution of India is
  17. Q17 "Gold Tranche" (Reserve Tranche) refers to
  18. Q18 With reference to the provisions contained in Part IV of the Constitution of India, which of the following statements is/are correct ? 1. They shall be enforceable by courts. 2…
  19. Q19 Consider the following statements : 1. According to the Constitution of India, a person who is eligible to vote can be made a minister in a State for six months even if he/she is…
  20. Q20 Consider the following statements : 1. The President of India can summon a session of the Parliament at such place as he/she thinks fit. 2. The Constitution of India provides for…
  21. Q21 With reference to the history of India, consider the following pairs : 1. Aurang — In-charge of treasury of the State 2. Banian — Indian agent of the East India Company 3…
  22. Q22 With reference to the religious history of India, consider the following statements : 1. Sthaviravadins belong to Mahayana Buddhism. 2. Lokottaravadin sect was an offshoot of…
  23. Q23 Which of the following statements correctly explains the impact of Industrial Revolution on India during the first half of the nineteenth century ?
  24. Q24 Consider the following events in the history of India : 1. Rise of Pratiharas under King Bhoja 2. Establishment of Pallava power under Mahendravarman – I 3. Establishment of Chola…
  25. Q25 Which of the following phrases defines the nature of the 'Hundi' generally referred to in the sources of the post-Harsha period ?
  26. Q26 With reference to the book “Desher Katha” written by Sakharam Ganesh Deuskar during the freedom struggle, consider the following statements : 1. It warned against the Colonial…
  27. Q27 The Gandhi-Irwin Pact included which of the following ? 1. Invitation to Congress to participate in the Round Table Conference 2. Withdrawal of Ordinances promulgated in…
  28. Q28 The Vital-Vidhvansak, the first monthly journal to have the untouchable people as its target audience was published by
  29. Q29 With reference to the history of India, the terms “kulyavapa” and “dronavapa” denote
  30. Q30 Who among the following rulers advised his subjects through this inscription ? “Whosoever praises his religious sect or blames other sects out of excessive devotion to his own…
  31. Q31 With reference to the cultural history of India, which one of the following is the correct description of the term 'paramitas'?
  32. Q32 In the context of Indian history, the Rakhmabai case of 1884 revolved around 1. women's right to gain education 2. age of consent 3. restitution of conjugal rights Select the…
  33. Q33 Indigo cultivation in India declined by the beginning of the 20th century because of
  34. Q34 Wellesley established the Fort William College at Calcutta because
  35. Q35 With reference to the history of India, "Ulgulan" or the Great Tumult is the description of which of the following events?
  36. Q36 With reference to the scholars/litterateurs of ancient India, consider the following statements : 1. Panini is associated with Pushyamitra Shunga. 2. Amarasimha is associated with…
  37. Q37 In the context of recent advances in human reproductive technology, "Pronuclear Transfer" is used for
  38. Q38 With the present state of development, Artificial Intelligence can effectively do which of the following ? 1. Bring down electricity consumption in industrial units 2. Create…
  39. Q39 With reference to Visible Light Communication (VLC) technology, which of the following statements are correct ? 1. VLC uses electromagnetic spectrum wavelengths 375 to 780 nm. 2…
  40. Q40 With reference to "Blockchain Technology", consider the following statements : 1. It is a public ledger that everyone can inspect, but which no single user controls. 2. The…
  41. Q41 With reference to carbon nanotubes, consider the following statements : 1. They can be used as carriers of drugs and antigens in the human body. 2. They can be made into…
  42. Q42 Consider the following activities : 1. Spraying pesticides on a crop field 2. Inspecting the craters of active volcanoes 3. Collecting breath samples from spouting whales for DNA…
  43. Q43 "The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long, with lasers shining…
  44. Q44 Consider the following statements : 1. Genetic changes can be introduced in the cells that produce eggs or sperms of a prospective parent. 2. A person's genome can be edited…
  45. Q45 What is the importance of using Pneumococcal Conjugate Vaccines in India ? 1. These vaccines are effective against pneumonia as well as meningitis and sepsis. 2. Dependence on…
  46. Q46 In India, the term "Public Key Infrastructure" is used in the context of
  47. Q47 Which of the following statements are correct regarding the general difference between plant and animal cells ? 1. Plant cells have cellulose cell walls whilst animal cells do…
  48. Q48 Which of the following are the reasons/factors for exposure to benzene pollution ? 1. Automobile exhaust 2. Tobacco smoke 3. Wood burning 4. Using varnished wooden furniture 5…
  49. Q49 If another global financial crisis happens in the near future, which of the following actions/policies are most likely to give some immunity to India ? 1. Not depending on…
  50. Q50 If you withdraw ₹ 1,00,000 in cash from your Demand Deposit Account at your bank, the immediate effect on aggregate money supply in the economy will be
  51. Q51 With reference to Foreign Direct Investment in India, which one of the following is considered its major characteristic ?
  52. Q52 With reference to the international trade of India at present, which of the following statements is/are correct ? 1. India's merchandise exports are less than its merchandise…
  53. Q53 The term 'West Texas Intermediate', sometimes found in news, refers to a grade of
  54. Q54 In the context of the Indian economy, non-financial debt includes which of the following ? 1. Housing loans owed by households 2. Amounts outstanding on credit cards 3. Treasury…
  55. Q55 In India, why are some nuclear reactors kept under "IAEA Safeguards" while others are not ?
  56. Q56 With reference to Trade-Related Investment Measures (TRIMS), which of the following statements is/are correct ? 1. Quantitative restrictions on imports by foreign investors are…
  57. Q57 If the RBI decides to adopt an expansionist monetary policy, which of the following would it not do ? 1. Cut and optimize the Statutory Liquidity Ratio 2. Increase the Marginal…
  58. Q58 With reference to the Indian economy after the 1991 economic liberalization, consider the following statements : 1. Worker productivity (₹ per worker at 2004-05 prices) increased…
  59. Q59 Consider the following statements : 1. In terms of short-term credit delivery to the agriculture sector, District Central Cooperative Banks (DCCBs) deliver more credit in…
  60. Q60 In India, under cyber insurance for individuals, which of the following benefits are generally covered, in addition to payment for the loss of funds and other benefits ? 1. Cost…
  61. Q61 In India, which of the following can be considered as public investment in agriculture ? 1. Fixing Minimum Support Price for agricultural produce of all crops 2. Computerization…
  62. Q62 What is the importance of the term "Interest Coverage Ratio" of a firm in India ? 1. It helps in understanding the present risk of a firm that a bank is going to give loan to. 2…
  63. Q63 Which of the following factors/policies were affecting the price of rice in India in the recent past ? 1. Minimum Support Price 2. Government's trading 3. Government's stockpiling…
  64. Q64 Consider the following statements : 1. The value of Indo-Sri Lanka trade has consistently increased in the last decade. 2. "Textile and textile articles" constitute an important…
  65. Q65 In which one of the following groups are all the four countries members of G20 ?
  66. Q66 Under the Kisan Credit Card scheme, short-term credit support is given to farmers for which of the following purposes ? 1. Working capital for maintenance of farm assets 2…
  67. Q67 Consider the following statements : 1. The weightage of food in Consumer Price Index (CPI) is higher than that in Wholesale Price Index (WPI). 2. The WPI does not capture changes…
  68. Q68 Consider the following pairs : River — Flows into 1. Mekong — Andaman Sea 2. Thames — Irish Sea 3. Volga — Caspian Sea 4. Zambezi — Indian Ocean Which of the pairs given above…
  69. Q69 Consider the following statements : 1. In the case of all cereals, pulses and oil-seeds, the procurement at Minimum Support Price (MSP) is unlimited in any State/UT of India. 2…
  70. Q70 With reference to the Indian economy, consider the following statements : 1. 'Commercial Paper' is a short-term unsecured promissory note. 2. 'Certificate of Deposit' is a…
  71. Q71 With reference to the cultural history of India, consider the following pairs : 1. Parivrajaka — Renunciant and Wanderer 2. Shramana — Priest with a high status 3. Upasaka — Lay…
  72. Q72 With reference to Indian elephants, consider the following statements : 1. The leader of an elephant group is a female. 2. The maximum gestation period can be 22 months. 3. An…
  73. Q73 Which of the following Protected Areas are located in Cauvery basin ? 1. Nagarhole National Park 2. Papikonda National Park 3. Sathyamangalam Tiger Reserve 4. Wayanad Wildlife…
  74. Q74 With reference to India's biodiversity, Ceylon frogmouth, Coppersmith barbet, Gray-chinned minivet and White-throated redstart are
  75. Q75 Which one of the following protected areas is well-known for the conservation of a sub-species of the Indian swamp deer (Barasingha) that thrives well on hard ground and is…
  76. Q76 Steel slag can be the material for which of the following ? 1. Construction of base road 2. Improvement of agricultural soil 3. Production of cement Select the correct answer…
  77. Q77 Which of the following are the most likely places to find the musk deer in its natural habitat ? 1. Askot Wildlife Sanctuary 2. Gangotri National Park 3. Kishanpur Wildlife…
  78. Q78 In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint ? 1. Copper slag 2. Cold mix…
  79. Q79 Consider the following statements : 1. Coal ash contains arsenic, lead and mercury. 2. Coal-fired power plants release sulphur dioxide and oxides of nitrogen into the environment…
  80. Q80 What is the use of biochar in farming ? 1. Biochar can be used as a part of the growing medium in vertical farming. 2. When biochar is a part of the growing medium, it promotes…
  81. Q81 If a particular plant species is placed under Schedule VI of The Wildlife Protection Act, 1972, what is the implication ?
  82. Q82 With reference to the period of Gupta dynasty in ancient India, the towns Ghantasala, Kadura and Chaul were well known as
  83. Q83 What is/are the advantage/advantages of zero tillage in agriculture ? 1. Sowing of wheat is possible without burning the residue of previous crop. 2. Without the need for nursery…
  84. Q84 According to India’s National Policy on Biofuels, which of the following can be used as raw materials for the production of biofuels ? 1. Cassava 2. Damaged wheat grains 3…
  85. Q85 Which one of the following statements best describes the term ‘Social Cost of Carbon’ ? It is a measure, in monetary value, of the
  86. Q86 With reference to pulse production in India, consider the following statements : 1. Black gram can be cultivated as both kharif and rabi crop. 2. Green-gram alone accounts for…
  87. Q87 “The crop is subtropical in nature. A hard frost is injurious to it. It requires at least 210 frost-free days and 50 to 100 centimeters of rainfall for its growth. A light…
  88. Q88 With reference to solar water pumps, consider the following statements : 1. Solar power can be used for running surface pumps and not for submersible pumps. 2. Solar power can be…
  89. Q89 With reference to the current trends in the cultivation of sugarcane in India, consider the following statements : 1. A substantial saving in seed material is made when 'bud chip…
  90. Q90 In the context of India, which of the following is/are considered to be practice(s) of eco-friendly agriculture ? 1. Crop diversification 2. Legume intensification 3. Tensiometer…
  91. Q91 What are the advantages of fertigation in agriculture ? 1. Controlling the alkalinity of irrigation water is possible. 2. Efficient application of Rock Phosphate and all other…
  92. Q92 Consider the following minerals : 1. Bentonite 2. Chromite 3. Kyanite 4. Sillimanite In India, which of the above is/are officially designated as major minerals ?
  93. Q94 With reference to chemical fertilizers in India, consider the following statements : 1. At present, the retail price of chemical fertilizers is market-driven and not administered…
  94. Q95 With reference to India's Desert National Park, which of the following statements are correct ? 1. It is spread over two districts. 2. There is no human habitation inside the…
  95. Q96 Siachen Glacier is situated to the
  96. Q97 With reference to the history of India, consider the following pairs : Famous Place Present State 1. Bhilsa — Madhya Pradesh 2. Dwarasamudra — Maharashtra 3. Girinagar — Gujarat…
  97. Q98 Consider the following statements : 1. 36% of India's districts are classified as "overexploited" or "critical" by the Central Ground Water Authority (CGWA). 2. CGWA was formed…
  98. Q99 Consider the following statements : 1. Jet streams occur in the Northern Hemisphere only. 2. Only some cyclones develop an eye. 3. The temperature inside the eye of a cyclone is…
  99. Q100 Among the following Tiger Reserves, which one has the largest area under "Critical Tiger Habitat" ?

CSAT Paper II

80 questions

Basic Numeracy 31 · Comprehension 25 · Mental Ability 11 · Data Interpretation 7 · Logical Reasoning 6

  1. Q1 Which one of the following is best implied in the passage?
  2. Q2 On the basis of the above passage, the following assumptions have been made : 1. State should have some institutions to ensure its appropriate role in a digital society. 2. State…
  3. Q3 Which one of the following is the most logical and rational inference that can be made from the above passage?
  4. Q4 Which one of the following statements best implies the suggestion given by the author of the passage?
  5. Q5 With reference to the above passage, the following assumptions have been made : 1. Biotechnology regulation is an evolving process. 2. Participation of people is needed in policy…
  6. Q6 Which one of the following statements best implies the crux of the passage?
  7. Q7 How many zeroes are there at the end of the following product? 1 × 5 × 10 × 15 × 20 × 25 × 30 × 35 × 40 × 45 × 50 × 55 × 60
  8. Q8 Let XYZ be a three-digit number, where (X + Y + Z) is not a multiple of 3. Then (XYZ + YZX + ZXY) is not divisible by
  9. Q9 Let p, q, r and s be natural numbers such that p - 2016 = q + 2017 = r - 2018 = s + 2019 Which one of the following is the largest natural number?
  10. Q10 How many five-digit prime numbers can be obtained by using all the digits 1, 2, 3, 4 and 5 without repetition of digits?
  11. Q11 In the sum ⊗ + 1⊗ + 5⊗ + ⊗⊗ + ⊗1 = 1⊗⊗ for which digit does the symbol ⊗ stand?
  12. Q12 If you have two straight sticks of length 7·5 feet and 3·25 feet, what is the minimum length can you measure?
  13. Q13 A simple mathematical operation in each number of the sequence 14, 18, 20, 24, 30, 32, ... results in a sequence with respect to prime numbers. Which one of the following is the…
  14. Q14 One page is torn from a booklet whose pages are numbered in the usual manner starting from the first page as 1. The sum of the numbers on the remaining pages is 195. The torn page…
  15. Q15 Consider the following arrangement that has some missing letters : abab_b_bcb_dcdcded_d The missing letters which complete the arrangement are
  16. Q16 Let A3BC and DE2F be four-digit numbers where each letter represents a different digit greater than 3. If the sum of the numbers is 15902, then what is the difference between the…
  17. Q17 Two Statements S1 and S2 are given below followed by a Question : S1 : There are not more than two figures on any page of a 51-page book. S2 : There is at least one figure on…
  18. Q18 Consider the following data : | | Average marks in English | Average marks in Hindi | | :--- | :---: | :---: | | Girls | 9 | 8 | | Boys | 8 | 7 | | Overall average marks | 8·8 | x…
  19. Q19 A family of two generations consisting of six members P, Q, R, S, T and U has three males and three females. There are two married couples and two unmarried siblings. U is P's…
  20. Q20 If in a particular year 12th January is a Sunday, then which one of the following is correct?
  21. Q21 With reference to the above passage, the following assumptions have been made : 1. Relying on foreign investment in the long run is not an economically sound policy. 2. Policies…
  22. Q22 With reference to the above passage, which of the following could be the most rational and practical implications for India? 1. Inter-linking of rivers should be undertaken. 2. A…
  23. Q23 With reference to the above passage, the following assumptions have been made : 1. Lower tax rates in a country invariably translate into greater investments in higher education…
  24. Q24 What is the most logical and crucial message conveyed by the passage?
  25. Q25 With reference to the above passage, the following assumptions have been made : 1. Rich cities only can ensure sustainable delivery of water. 2. Sustainable delivery of water in…
  26. Q26 With reference to the above passage, the following assumptions have been made : 1. Structural and rural transformation is impossible when farms are mainly small and marginal. 2. A…
  27. Q27 Which one of the following statements best reflects the critical message of the passage?
  28. Q28 Two Statements S1 and S2 are given below with regard to four numbers P, Q, R and S followed by a Question : S1 : R is greater than P as well as Q. S2 : S is not the largest one…
  29. Q29 Two Statements S1 and S2 are given below followed by a Question : S1 : n is a prime number. S2 : n leaves a remainder of 1 when divided by 4. Question : If n is a unique natural…
  30. Q30 Two Statements S1 and S2 are given below with regard to two numbers followed by a Question : S1 : Their product is 21. S2 : Their sum is 10. Question : What are the two numbers?…
  31. Q31 A man walks down the backside of his house straight 25 metres, then turns to the right and walks 50 metres again; then he turns towards left and again walks 25 metres. If his…
  32. Q32 Two Statements are given followed by two Conclusions : Statements : All numbers are divisible by 2. All numbers are divisible by 3. Conclusion-I : All numbers are divisible by 6…
  33. Q33 Two Statements are given followed by two Conclusions : Statements : All cats are dogs. All cats are black. Conclusion-I : All dogs are black. Conclusion-II : Some dogs are not…
  34. Q34 Consider the following sequence of numbers : 5 1 4 7 3 9 8 5 7 2 6 3 1 5 8 6 3 8 5 2 2 4 3 4 9 6 How many odd numbers are followed by the odd number in the above sequence?
  35. Q35 A is 16th from the left end in a row of boys and V is 18th from the right end. G is 11th from A towards the right and 3rd from V towards the right end. How many boys are there in…
  36. Q36 Three Statements S1, S2 and S3 are given below followed by a Question : S1 : C is younger than D, but older than A and B. S2 : D is the oldest. S3 : A is older than B. Question…
  37. Q37 How many integers are there between 1 and 100 which have 4 as a digit but are not divisible by 4?
  38. Q38 Let x, y be the volumes; m, n be the masses of two metallic cubes P and Q respectively. Each side of Q is two times that of P and mass of Q is two times that of P. Let u = m / x…
  39. Q39 The average age of a teacher and three students is 20 years. If all the three students are of same age and the difference between the age of the teacher and each student is 20…
  40. Q40 A person bought a car and sold it for ₹ 3,00,000. If he incurred a loss of 20%, then how much did he spend to buy the car?
  41. Q41 Which one of the following statements best reflects the critical message of the passage?
  42. Q42 With reference to the above passage, which of the following is/are the most rational and practical implication/implications? 1. India's Public Distribution System should be…
  43. Q43 Which of the following are the most rational inferences that can be made from the passage? 1. Farmers' income will be higher with pulse cultivation than with paddy cultivation. 2…
  44. Q44 With reference to the above passage, the following assumptions have been made : 1. High risks involved in holding maximum water in reservoirs are due to our over-dependence on…
  45. Q45 Which of the following is/are the most rational and logical inference/inferences that can be made from the passage? 1. It is essential to rethink and redefine the economic role of…
  46. Q46 With reference to the above passage, the following assumptions have been made : 1. India's economy needs to be greatly integrated with global economy so as to create large number…
  47. Q47 A shop owner offers the following discount options on an article to a customer : 1. Successive discounts of 10% and 20%, and then pay a service tax of 10% 2. Successive discounts…
  48. Q48 The letters from A to Z are numbered from 1 to 26 respectively. If GHI = 1578 and DEF = 912, then what is ABC equal to?
  49. Q49 What is the missing term @ in the following? ACPQ : BESU :: MNGI : @
  50. Q50 What is the largest number among the following?
  51. Q51 What is the greatest length x such that 3 1/2 m and 8 3/4 m are integral multiples of x?
  52. Q52 Consider the following data : Year | Birthrate | Death rate 1911–1921 | 48·1 | 35·5 1921–1931 | 46·4 | 36·3 1931–1941 | 45·2 | 31·2 1941–1951 | 39·9 | 27·4 1951–1961 | 41·7 | 22·8…
  53. Q53 The recurring decimal representation 1·272727... is equivalent to
  54. Q54 What is the least four-digit number when divided by 3, 4, 5 and 6 leaves a remainder 2 in each case?
  55. Q55 In adult population of a city, 40% men and 30% women are married. What is the percentage of married adult population if no man marries more than one woman and no woman marries…
  56. Q56 What is the remainder when 51 × 27 × 35 × 62 × 75 is divided by 100?
  57. Q57 A sum of ₹ 2,500 is distributed among X, Y and Z in the ratio 1/2 : 3/4 : 5/6. What is the difference between the maximum share and the minimum share?
  58. Q58 For what value of n, the sum of digits in the number (10ⁿ + 1) is 2?
  59. Q59 In a class, there are three groups A, B and C. If one student from group A and two students from group B are shifted to group C, then what happens to the average weight of the…
  60. Q60 How many different sums can be formed with the denominations ₹ 50, ₹ 100, ₹ 200, ₹ 500 and ₹ 2,000 taking at least three denominations at a time?
  61. Q61 Which one of the following is the most logical and rational inference that can be made from the above passage?
  62. Q62 Which one of the following is the most logical and rational inference that can be made from the above passage?
  63. Q63 With reference to the above passage, the following assumptions have been made : 1. Governments often provide inefficient and costly subsidies for technologies that may not be…
  64. Q64 With reference to the above passage, the following assumptions have been made : 1. Genome editing does not require the transfer of genes from one plant to another. 2. Through…
  65. Q65 In the context of India, which one of the following statements best reflects the critical message of the passage?
  66. Q66 What is the most logical inference from the above passage?
  67. Q67 How many different 5-letter words (with or without meaning) can be constructed using all the letters of the word 'DELHI' so that each word has to start with D and end with I?
  68. Q68 A bottle contains 20 litres of liquid A. 4 litres of liquid A is taken out of it and replaced by same quantity of liquid B. Again 4 litres of the mixture is taken out and replaced…
  69. Q69 The average score of a batsman after his 50th innings was 46·4. After 60th innings, his average score increases by 2·6. What was his average score in the last ten innings?
  70. Q70 As a result of 25% hike in the price of rice per kg, a person is able to purchase 6 kg less rice for ₹ 1,200. What was the original price of rice per kg?
  71. Q71 A person X can complete 20% of work in 8 days and another person Y can complete 25% of the same work in 6 days. If they work together, in how many days will 40% of the work be…
  72. Q72 A car travels from a place X to place Y at an average speed of v km/hr, from Y to X at an average speed of 2v km/hr, again from X to Y at an average speed of 3v km/hr and again…
  73. Q73 Consider the following statements : 1. The minimum number of points of intersection of a square and a circle is 2. 2. The maximum number of points of intersection of a square and…
  74. Q74 A man takes half time in rowing a certain distance downstream than upstream. What is the ratio of the speed in still water to the speed of current?
  75. Q75 How many pairs of natural numbers are there such that the difference of whose squares is 63?
  76. Q76 Which one of the following will have minimum change in its value if 5 is added to both numerator and the denominator of the fractions 2/3, 3/4, 4/5 and 5/6?
  77. Q77 A digit n > 3 is divisible by 3 but not divisible by 6. Which one of the following is divisible by 4?
  78. Q78 If 1 litre of water weighs 1 kg, then how many cubic millimetres of water will weigh 0·1 gm?
  79. Q79 A vessel full of water weighs 40 kg. If it is one-third filled, its weight becomes 20 kg. What is the weight of the empty vessel?
  80. Q80 A frog tries to come out of a dried well 4·5 m deep with slippery walls. Every time the frog jumps 30 cm, slides down 15 cm. What is the number of jumps required for the frog to…

Question papers and answer keys: Union Public Service Commission. Explanations: UPSC Answer Check.