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Study Guide · Chapter 20

Mock Test 6 — Delhi Police Constable Full Pattern (100 MCQs)

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This is a full-length practice test following the exact Delhi Police Constable written exam pattern: 25 Reasoning, 50 General Knowledge & Current Affairs, 15 Numerical Ability, and 10 Computer Knowledge questions.

Section A: Reasoning (Q1–25)

  1. In the analogy "Key is to Lock as Password is to ___," the missing word is:
    (a) Account (b) Computer (c) Door (d) Card
  2. Find the missing number in the series: 7, 14, 28, 56, ?
    (a) 112 (b) 108 (c) 116 (d) 104
  3. Which one does not belong with the others: Cricket, Football, Hockey, Referee?
    (a) Referee (b) Cricket (c) Football (d) Hockey
  4. In a code, ROSE is coded as TQUG (each letter shifted two places forward). How is TULIP coded using the same rule?
    (a) VWNKR (b) VWNJR (c) UWNKR (d) VXNKR
  5. A woman walks 7 km north, then 24 km east. How far is she from her starting point?
    (a) 25 km (b) 28 km (c) 30 km (d) 22 km
  6. X is Y's husband. Z is Y's mother. How is X related to Z?
    (a) Son-in-law (b) Son (c) Brother-in-law (d) Nephew
  7. In the letter series E, H, L, Q, ?, what is the next letter (gaps +3, +4, +5, next +6)?
    (a) W (b) V (c) X (d) U
  8. Given: J ≥ K > L ≥ M. Which of the following must be true?
    (a) J ≥ M (b) M > J (c) K < M (d) L > J
  9. In a class of 42 students, Priyanka ranks 16th from the bottom. What is her rank from the top?
    (a) 27th (b) 26th (c) 28th (d) 25th
  10. If '@' denotes '+', '#' denotes '−', '%' denotes '×', and '$' denotes '÷', evaluate: 54 $ 9 % 4 @ 12 # 5.
    (a) 31 (b) 29 (c) 33 (d) 27
  11. Nine people sit in a row facing north. A sits at the left end. B sits immediately to the right of A. C sits fourth to the right of B. How many people sit to the right of C?
    (a) 3 (b) 4 (c) 2 (d) 5
  12. Statements: All auditors are professionals. Some professionals are consultants. Conclusion: Some auditors are consultants. Does this conclusion necessarily follow?
    (a) No, it does not necessarily follow (b) Yes, it follows validly (c) Only if all professionals are auditors (d) Cannot be determined
  13. In a code, PATROL is coded by each letter's position in the alphabet as 16-1-20-18-15-12. How is CIRCLE coded using the same rule?
    (a) 3-9-18-3-12-5 (b) 3-9-18-3-12-4 (c) 2-9-18-3-12-5 (d) 3-8-18-3-12-5
  14. Find the missing number in the series: 300, 270, 243, 219, ?
    (a) 198 (b) 196 (c) 200 (d) 194
  15. A woman is facing north. She turns 90° anticlockwise, then 90° clockwise, then 90° clockwise. Which direction is she facing now?
    (a) East (b) West (c) North (d) South
  16. A is nine times as old as B. Two years ago, A was seventeen times as old as B. Find B's present age.
    (a) 4 years (b) 5 years (c) 3 years (d) 6 years
  17. Find the missing number in the series: 11, 24, 50, 102, ?
    (a) 206 (b) 204 (c) 208 (d) 202
  18. Which of the following is not a multiple of 9: 82, 63, 72, 90?
    (a) 82 (b) 63 (c) 72 (d) 90
  19. Seven colleagues sit in a row facing north. D sits at the right end. E sits immediately to the left of D. F sits third to the left of E. How many colleagues sit to the left of F?
    (a) 2 (b) 3 (c) 1 (d) 4
  20. Statements: All patrol officers carry identification badges. All identification badges are numbered. Conclusion: All patrol officers carry numbered identification. Does this follow?
    (a) Yes, it follows validly (b) No (c) Cannot be determined (d) Only partially
  21. Find the missing number in the series: 6, 14, 30, 62, ?
    (a) 126 (b) 124 (c) 128 (d) 122
  22. In the analogy "Tailor is to Cloth as Carpenter is to ___," the missing word is:
    (a) Wood (b) Hammer (c) Nail (d) Furniture
  23. In a code, WINTER is coded as XJOUFS (each letter shifted one place forward). How is SUMMER coded using the same rule?
    (a) TVNNFS (b) TVNNFR (c) SVNNFS (d) TVMNFS
  24. In a row of 65 people, Deepak is 28th from the left. What is his position from the right?
    (a) 38th (b) 37th (c) 39th (d) 36th
  25. Statements: All uniforms are official attire. No official attire is casual clothing. Conclusion: No uniform is casual clothing. Does this follow?
    (a) Yes, it follows validly (b) No (c) Cannot be determined (d) Only partially

Section B: General Knowledge & Current Affairs (Q26–75)

  1. Who was the first Home Minister of independent India?
    (a) Sardar Vallabhbhai Patel (b) Jawaharlal Nehru (c) Rajendra Prasad (d) Morarji Desai
  2. Which Article of the Indian Constitution deals with the Right to Equality?
    (a) Article 14 (b) Article 19 (c) Article 21 (d) Article 32
  3. Which Indian city is known as the "Steel City of India"?
    (a) Jamshedpur (b) Bhilai (c) Rourkela (d) Durgapur
  4. The Non-Cooperation Movement was called off by Gandhi after which incident?
    (a) The Chauri Chaura incident (b) The Jallianwala Bagh massacre (c) The Dandi March (d) The Poona Pact
  5. Which is the largest coldwater desert in India?
    (a) Ladakh (b) Thar Desert (c) Rann of Kutch (d) Deccan Plateau
  6. Who was the Governor-General of India during the Revolt of 1857?
    (a) Lord Canning (b) Lord Dalhousie (c) Lord Curzon (d) Lord Wellesley
  7. The Bhabha Atomic Research Centre (BARC) is located in:
    (a) Mumbai (b) Chennai (c) Bengaluru (d) Kolkata
  8. Which is the second highest civilian award in India?
    (a) Padma Vibhushan (b) Bharat Ratna (c) Padma Bhushan (d) Padma Shri
  9. Who was the first Indian to become a judge of the International Court of Justice?
    (a) Nagendra Singh (b) B.R. Ambedkar (c) M.C. Chagla (d) H.J. Kania
  10. Which Indian state has the highest forest cover by percentage of geographical area?
    (a) Mizoram (b) Arunachal Pradesh (c) Madhya Pradesh (d) Chhattisgarh
  11. The Cripps Mission came to India in which year?
    (a) 1942 (b) 1935 (c) 1946 (d) 1919
  12. Which is the national aquatic animal of India?
    (a) Ganges River Dolphin (b) Blue Whale (c) Gharial (d) Olive Ridley Turtle
  13. Who was the first Speaker of the Lok Sabha?
    (a) G.V. Mavalankar (b) Neelam Sanjiva Reddy (c) Balram Jakhar (d) Somnath Chatterjee
  14. Which Indian city is known as the "Detroit of India" for its automobile industry?
    (a) Chennai (b) Pune (c) Gurugram (d) Ludhiana
  15. The Second Battle of Panipat was fought in which year?
    (a) 1556 (b) 1526 (c) 1761 (d) 1191
  16. Which is the largest bird sanctuary in India?
    (a) Keoladeo Ghana National Park (b) Chilika Lake Bird Sanctuary (c) Bharatpur Sanctuary (d) Ranganathittu Bird Sanctuary
  17. Who founded the Indian Reforms Association leading to the Widow Remarriage movement?
    (a) Ishwar Chandra Vidyasagar (b) Raja Ram Mohan Roy (c) Swami Vivekananda (d) Dayanand Saraswati
  18. Which is the busiest railway station in India by passenger footfall?
    (a) Howrah Junction (b) New Delhi Railway Station (c) Chhatrapati Shivaji Maharaj Terminus (d) Chennai Central
  19. The Treaty of Bassein was signed in which year?
    (a) 1802 (b) 1857 (c) 1764 (d) 1707
  20. Which Indian state is known as the "Rice Bowl of India"?
    (a) Chhattisgarh (b) Punjab (c) Haryana (d) Uttar Pradesh
  21. Who was the first Indian to receive the Nobel Peace Prize?
    (a) Kailash Satyarthi (b) Mother Teresa (c) Amartya Sen (d) C.V. Raman
  22. Which mountain range separates India from China?
    (a) The Himalayas (b) The Aravallis (c) The Western Ghats (d) The Vindhyas
  23. Who was the founder of the Theosophical Society in India?
    (a) Annie Besant, along with Helena Blavatsky and Henry Olcott (b) Raja Ram Mohan Roy (c) Swami Vivekananda (d) Ishwar Chandra Vidyasagar
  24. Which Indian city hosted the first Commonwealth Games held in India, in 2010?
    (a) New Delhi (b) Mumbai (c) Kolkata (d) Chennai
  25. The "Doctrine of Paramountcy" was applied by the British with respect to:
    (a) Relations with princely states (b) Taxation policy (c) Trade regulations (d) Military recruitment
  26. Which Indian state has the largest number of airports?
    (a) Uttar Pradesh (b) Maharashtra (c) Karnataka (d) Gujarat
  27. Who wrote the play "Mudrarakshasa," set during the Maurya period?
    (a) Vishakhadatta (b) Kalidasa (c) Bhasa (d) Banabhatta
  28. Which is the largest coral reef system in India?
    (a) Gulf of Mannar (b) Lakshadweep (c) Andaman and Nicobar Islands (d) Gulf of Kutch
  29. The "Simla Agreement" between India and Pakistan was signed in which year?
    (a) 1972 (b) 1965 (c) 1971 (d) 1999
  30. Which Indian state is the largest producer of natural rubber?
    (a) Kerala (b) Tamil Nadu (c) Karnataka (d) Tripura
  31. Who was the President of the Indian National Congress during the Quit India Movement?
    (a) Abul Kalam Azad (b) Jawaharlal Nehru (c) Subhas Chandra Bose (d) Rajendra Prasad
  32. Which Indian city is known as the "Boston of India"?
    (a) Ahmedabad (b) Surat (c) Pune (d) Coimbatore
  33. The "Blue Revolution" in India refers to the development of:
    (a) Fisheries and aquaculture (b) Dairy production (c) Oilseed production (d) Horticulture
  34. Which Indian state was the first to get 100% rural electrification?
    (a) Sikkim (b) Kerala (c) Gujarat (d) Goa
  35. Who was the last Governor-General of independent India before the office was abolished?
    (a) C. Rajagopalachari (b) Lord Mountbatten (c) Lord Wavell (d) Rajendra Prasad
  36. Which is the highest point in the Western Ghats?
    (a) Anamudi (b) Doddabetta (c) Mahendragiri (d) Kalsubai
  37. The "White Revolution" in India is associated with which leader?
    (a) Verghese Kurien (b) M.S. Swaminathan (c) Norman Borlaug (d) C. Subramaniam
  38. Which Indian classical dance form originated in Odisha?
    (a) Odissi (b) Kathak (c) Kathakali (d) Manipuri
  39. Who founded the Indian Association, a precursor to the Indian National Congress?
    (a) Surendranath Banerjee (b) Dadabhai Naoroji (c) A.O. Hume (d) W.C. Bonnerjee
  40. Which is the largest wetland in India, a Ramsar site?
    (a) Sundarbans (b) Chilika Lake (c) Vembanad Lake (d) Loktak Lake
  41. The First Round Table Conference was held in which year?
    (a) 1930 (b) 1931 (c) 1932 (d) 1935
  42. Which Indian state has the largest number of Members of Parliament in the Lok Sabha?
    (a) Uttar Pradesh (b) Maharashtra (c) West Bengal (d) Bihar
  43. Who is considered the founder of modern Hindi literature's "Chhayavaad" movement?
    (a) Jaishankar Prasad (b) Munshi Premchand (c) Ramdhari Singh Dinkar (d) Maithili Sharan Gupt
  44. Which is the deepest point in the Indian Ocean?
    (a) Sunda Trench (b) Mariana Trench (c) Java Trench (d) Puerto Rico Trench
  45. The "Government of India Act" that introduced provincial autonomy was passed in which year?
    (a) 1935 (b) 1919 (c) 1909 (d) 1858
  46. Which Indian state is the leading producer of spices?
    (a) Kerala (b) Karnataka (c) Andhra Pradesh (d) Tamil Nadu
  47. Who composed the patriotic song "Sare Jahan Se Achha"?
    (a) Muhammad Iqbal (b) Rabindranath Tagore (c) Bankim Chandra Chatterjee (d) Sarojini Naidu
  48. Which is the tallest statue in the world, located in Gujarat?
    (a) Statue of Unity (b) Statue of Liberty (c) Spring Temple Buddha (d) Christ the Redeemer
  49. The "Permanent Settlement" system of land revenue was introduced by which Governor-General?
    (a) Lord Cornwallis (b) Lord Wellesley (c) Lord Dalhousie (d) Warren Hastings
  50. Which Indian city is known as the "Cultural Capital of India"?
    (a) Kolkata (b) Varanasi (c) Chennai (d) Delhi

Section C: Numerical Ability (Q76–90)

  1. Simplify: 120 ÷ 10 + 9 × 6 − 22.
    (a) 44 (b) 42 (c) 46 (d) 40
  2. A sum of ₹22,000 amounts to ₹28,600 in 3 years at simple interest. Find the rate of interest per annum.
    (a) 10% (b) 8% (c) 12% (d) 9%
  3. The ratio of two numbers is 4:5. If their sum is 108, find the larger number.
    (a) 60 (b) 55 (c) 65 (d) 50
  4. A shopkeeper buys an article for ₹840 and sells it for ₹1,050. Find the profit percentage.
    (a) 25% (b) 20% (c) 30% (d) 15%
  5. Find the average of the first thirty natural numbers.
    (a) 15.5 (b) 15 (c) 16 (d) 14.5
  6. A train 160 m long crosses a pole in 16 seconds. Find its speed in km/h.
    (a) 36 km/h (b) 30 km/h (c) 40 km/h (d) 45 km/h
  7. If the cost price of 40 articles equals the selling price of 32 articles, find the profit percentage.
    (a) 25% (b) 20% (c) 30% (d) 15%
  8. Find the value of: 15% of 400 + 25% of 240.
    (a) 120 (b) 115 (c) 125 (d) 110
  9. A and B together can complete a piece of work in 24 days. A alone can do it in 40 days. In how many days can B alone complete it?
    (a) 60 days (b) 55 days (c) 65 days (d) 50 days
  10. Find the compound interest on ₹30,000 at 10% per annum for 2 years, compounded annually.
    (a) ₹6,300 (b) ₹6,000 (c) ₹6,600 (d) ₹5,700
  11. Solve for x: 10(x − 6) = 5x + 15.
    (a) 15 (b) 14 (c) 16 (d) 13
  12. Find the area of a circle with radius 21 cm (use π = 22/7).
    (a) 1,386 sq cm (b) 1,350 sq cm (c) 1,400 sq cm (d) 1,320 sq cm
  13. A boat's speed in still water is 25 km/h; stream speed is 5 km/h. Find the time to cover 120 km downstream.
    (a) 4 hours (b) 4.5 hours (c) 3.5 hours (d) 5 hours
  14. Find the missing number in the series: 12, 24, 48, 96, ?
    (a) 192 (b) 188 (c) 196 (d) 184
  15. A sum of ₹80,000 is divided between A and B such that A's share is 120% more than B's. Find B's share.
    (a) ₹25,000 (b) ₹23,000 (c) ₹27,000 (d) ₹21,000

Section D: Computer Knowledge (Q91–100)

  1. Which of the following is used to navigate and select items on a screen?
    (a) Mouse (b) Printer (c) Scanner (d) Speaker
  2. What does "OS" stand for in computing?
    (a) Operating System (b) Output System (c) Operational Software (d) Online System
  3. Which of the following is a presentation software?
    (a) MS PowerPoint (b) MS Excel (c) MS Access (d) MS Paint
  4. What is the full form of "FTP"?
    (a) File Transfer Protocol (b) Fast Transfer Protocol (c) File Transmission Protocol (d) Fast Transmission Protocol
  5. Which key combination is used to paste copied content?
    (a) Ctrl+V (b) Ctrl+C (c) Ctrl+X (d) Ctrl+Z
  6. Which of the following is an example of an antivirus software?
    (a) Quick Heal (b) MS Word (c) MS Excel (d) Google Chrome
  7. What does "CAPTCHA" primarily verify?
    (a) That the user is a human and not an automated program (b) A user's password strength (c) A user's internet speed (d) A file's size
  8. Which of the following is used to connect a computer to the internet via a telephone line?
    (a) Modem (b) Keyboard (c) Mouse (d) Monitor
  9. What does "HTML" stand for?
    (a) Hypertext Markup Language (b) High Text Markup Language (c) Hypertext Modern Language (d) Hyper Transfer Markup Language
  10. Which of the following is used to periodically back up important files?
    (a) A backup utility or external storage device (b) An antivirus program (c) A web browser (d) A spreadsheet program

Answer Key with Explanations

Section A:

1.(a) A key opens a lock, just as a password grants access to an account.

2.(a) Each term doubles: 7×2=14, 14×2=28, 28×2=56, 56×2=112.

3.(a) Cricket, football, and hockey are sports, while a referee is a person who officiates them, making it the odd one out.

4.(a) Each letter shifts two places forward: T+2=V, U+2=W, L+2=N, I+2=K, P+2=R, giving VWNKR.

5.(a) By the Pythagorean theorem, distance = √(7²+24²) = √(49+576) = √625 = 25 km.

6.(a) X is Y's husband, and Z is Y's mother, so X is Z's son-in-law.

7.(a) The gaps increase by one each time: E(5)+3=H(8), H+4=L(12), L+5=Q(17), Q+6=W(23).

8.(a) Since J≥K>L≥M, it follows directly that J≥M.

9.(a) Rank from the top = 42 − 16 + 1 = 27th.

10.(a) Following the order of operations: 54÷9=6, 6×4=24, 24+12=36, 36−5=31.

11.(a) A is at the left end (position 1); B is immediately right of A (position 2); C is fourth to the right of B, so C is at position 2+4=6; with nine people in the row, 3 people sit to the right of C.

12.(a) No, this does not necessarily follow: the "some professionals" who are consultants may or may not include the specific professionals who are auditors.

13.(a) Each letter is coded by its position in the alphabet; applying the same rule, CIRCLE is coded as 3-9-18-3-12-5.

14.(a) The differences fall by 3 each time: 30, 27, 24, then 21; 219−21 = 198.

15.(a) The net turn is 90° anticlockwise plus 90° clockwise plus 90° clockwise, which equals 90° clockwise overall; facing north, a 90° clockwise turn gives east.

16.(a) Let B's present age be x and A's be 9x; two years ago, 9x−2 = 17(x−2), giving 9x−2 = 17x−34, so 8x=32, x=4.

17.(a) Each term follows ×2+2: 11×2+2=24, 24×2+2=50, 50×2+2=102, 102×2+2=206.

18.(a) 63, 72, and 90 are multiples of 9, while 82 is not.

19.(a) D is at the right end (position 7); E is immediately left of D (position 6); F is third to the left of E, so F is at position 6−3=3; 2 people sit to the left of F (positions 1 and 2).

20.(a) Yes, this follows validly: all patrol officers carry identification badges, and all identification badges are numbered, so all patrol officers carry numbered identification.

21.(a) Each term follows ×2+2: 6×2+2=14, 14×2+2=30, 30×2+2=62, 62×2+2=126.

22.(a) A tailor works with cloth, just as a carpenter works with wood.

23.(a) Each letter shifts one place forward: S+1=T, U+1=V, M+1=N, M+1=N, E+1=F, R+1=S, giving TVNNFS.

24.(a) Position from the right = 65 − 28 + 1 = 38th.

25.(a) Yes, this follows validly: all uniforms are official attire, and no official attire is casual clothing, so no uniform is casual clothing.

Section B:

26.(a) Sardar Vallabhbhai Patel was the first Home Minister of independent India.

27.(a) Article 14 deals with the Right to Equality.

28.(a) Jamshedpur is known as the "Steel City of India."

29.(a) Gandhi called off the Non-Cooperation Movement after the Chauri Chaura incident of 1922.

30.(a) Ladakh is the largest coldwater desert in India.

31.(a) Lord Canning was the Governor-General of India during the Revolt of 1857.

32.(a) The Bhabha Atomic Research Centre is located in Mumbai.

33.(a) The Padma Vibhushan is the second highest civilian award in India, after the Bharat Ratna.

34.(a) Nagendra Singh was the first Indian to become a judge of the International Court of Justice.

35.(a) Mizoram has the highest forest cover by percentage of geographical area among Indian states.

36.(a) The Cripps Mission came to India in 1942.

37.(a) The Ganges River Dolphin is the national aquatic animal of India.

38.(a) G.V. Mavalankar was the first Speaker of the Lok Sabha.

39.(a) Chennai is known as the "Detroit of India" for its automobile industry.

40.(a) The Second Battle of Panipat was fought in 1556.

41.(a) Keoladeo Ghana National Park is the largest bird sanctuary in India.

42.(a) Ishwar Chandra Vidyasagar founded the Indian Reforms Association leading to the Widow Remarriage movement.

43.(a) Howrah Junction is the busiest railway station in India by passenger footfall.

44.(a) The Treaty of Bassein was signed in 1802.

45.(a) Chhattisgarh is known as the "Rice Bowl of India."

46.(a) Kailash Satyarthi was the first Indian to receive the Nobel Peace Prize.

47.(a) The Himalayas separate India from China.

48.(a) Annie Besant, along with Helena Blavatsky and Henry Olcott, founded the Theosophical Society in India.

49.(a) New Delhi hosted the first Commonwealth Games held in India, in 2010.

50.(a) The "Doctrine of Paramountcy" was applied by the British with respect to relations with princely states.

51.(a) Uttar Pradesh has the largest number of airports among Indian states.

52.(a) Vishakhadatta wrote the play "Mudrarakshasa," set during the Maurya period.

53.(a) The Gulf of Mannar has the largest coral reef system in India.

54.(a) The Simla Agreement between India and Pakistan was signed in 1972.

55.(a) Kerala is the largest producer of natural rubber among Indian states.

56.(a) Abul Kalam Azad was the President of the Indian National Congress during the Quit India Movement.

57.(a) Pune is known as the "Boston of India."

58.(a) The "Blue Revolution" in India refers to the development of fisheries and aquaculture.

59.(a) Sikkim was the first Indian state to get 100% rural electrification.

60.(a) C. Rajagopalachari was the last Governor-General of independent India before the office was abolished.

61.(a) Anamudi is the highest point in the Western Ghats.

62.(a) Verghese Kurien is associated with the "White Revolution" in India.

63.(a) Odissi originated in Odisha.

64.(a) Surendranath Banerjee founded the Indian Association, a precursor to the Indian National Congress.

65.(a) The Sundarbans is the largest wetland in India recognised as a Ramsar site.

66.(a) The First Round Table Conference was held in 1930.

67.(a) Uttar Pradesh has the largest number of Members of Parliament in the Lok Sabha.

68.(a) Jaishankar Prasad is considered a founder of modern Hindi literature's "Chhayavaad" movement.

69.(a) The Sunda Trench is the deepest point in the Indian Ocean.

70.(a) The Government of India Act, 1935, introduced provincial autonomy.

71.(a) Kerala is the leading producer of spices among Indian states.

72.(a) Muhammad Iqbal composed the patriotic song "Sare Jahan Se Achha."

73.(a) The Statue of Unity, located in Gujarat, is the tallest statue in the world.

74.(a) Lord Cornwallis introduced the "Permanent Settlement" system of land revenue.

75.(a) Kolkata is known as the "Cultural Capital of India."

Section C:

76.(a) 120÷10=12; 9×6=54; 12+54−22=44.

77.(a) Interest = 28,600−22,000 = ₹6,600 over 3 years; rate = (6,600×100)/(22,000×3) = 10%.

78.(a) The parts total 4+5=9; larger number = 108×5/9 = 60.

79.(a) Profit = 1,050−840 = ₹210; profit percentage = (210/840)×100 = 25%.

80.(a) The first thirty natural numbers sum to 465; average = 465/30 = 15.5.

81.(a) Speed = 160 m / 16 s = 10 m/s = 10×18/5 = 36 km/h.

82.(a) If CP of 40 articles equals SP of 32 articles, SP/CP per article = 40/32 = 1.25, a profit of 25%.

83.(a) 15% of 400 = 60; 25% of 240 = 60; sum = 120.

84.(a) Combined rate = 1/24; A's rate = 1/40; B's rate = 1/24−1/40 = 5/120−3/120 = 2/120 = 1/60, so B alone takes 60 days.

85.(a) Amount = 30,000×(1.10)² = 36,300; compound interest = ₹6,300.

86.(a) 10(x−6)=5x+15 gives 10x−60=5x+15, so 5x=75, x=15.

87.(a) Area = (22/7)×21² = 22×63 = 1,386 sq cm.

88.(a) Downstream speed = 25+5 = 30 km/h; time = 120/30 = 4 hours.

89.(a) Each term doubles: 12×2=24, 24×2=48, 48×2=96, 96×2=192.

90.(a) A's share is 2.2 times B's (120% more), so 3.2 parts = 80,000, giving B's share = ₹25,000.

Section D:

91.(a) A mouse is used to navigate and select items on a screen.

92.(a) OS stands for Operating System.

93.(a) MS PowerPoint is a presentation software.

94.(a) FTP stands for File Transfer Protocol.

95.(a) Ctrl+V is used to paste copied content.

96.(a) Quick Heal is an example of antivirus software.

97.(a) CAPTCHA primarily verifies that the user is a human and not an automated program.

98.(a) A modem is used to connect a computer to the internet via a telephone line.

99.(a) HTML stands for Hypertext Markup Language.

100.(a) A backup utility or external storage device is used to periodically back up important files.

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