Mock Test 13 — Delhi Police Constable Full Pattern (100 MCQs)

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 "Postman is to Letter as Courier is to ___," the missing word is:
   (a) Parcel (b) Van (c) Address (d) Stamp
2. Find the missing number in the series: 5, 20, 80, 320, ?
   (a) 1280 (b) 1260 (c) 1300 (d) 1240
3. Which one does not belong with the others: Diamond, Ruby, Emerald, Marble?
   (a) Marble (b) Diamond (c) Ruby (d) Emerald
4. In a code, RIVER is coded as SJWFS (each letter shifted one place forward). How is OCEAN coded using the same rule?
   (a) PDFBO (b) PDFBN (c) ODFBO (d) PDGBO
5. A man walks 9 km north, then 40 km east. How far is he from his starting point?
   (a) 41 km (b) 45 km (c) 49 km (d) 35 km
6. Q is R's mother. S is R's father. How is Q related to S?
   (a) Wife (b) Sister (c) Daughter (d) Mother
7. In the letter series L, O, S, X, ?, what is the next letter (gaps +3, +4, +5, next +6)?
   (a) AD (b) AC (c) AB (d) AA
8. Given: G ≥ H > I ≥ J. Which of the following must be true?
   (a) G ≥ J (b) J > G (c) H < J (d) I > G
9. In a class of 90 students, Meenal ranks 40th from the top. What is her rank from the bottom?
   (a) 51st (b) 50th (c) 52nd (d) 49th
10. If '@' denotes '+', '#' denotes '−', '%' denotes '×', and '$' denotes '÷', evaluate: 132 $ 11 % 6 @ 40 # 25.
    (a) 87 (b) 85 (c) 89 (d) 83
11. Sixteen people sit in a row facing north. P sits at the left end. Q sits immediately to the right of P. R sits eleventh to the right of Q. How many people sit to the right of R?
    (a) 3 (b) 4 (c) 2 (d) 5
12. Statements: All monitors are supervisors. Some supervisors are trainers. Conclusion: Some monitors are trainers. Does this conclusion necessarily follow?
    (a) No, it does not necessarily follow (b) Yes, it follows validly (c) Only if all supervisors are monitors (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: 1000, 900, 810, 729, ?
    (a) 656.1 (b) 650 (c) 660 (d) 645
15. A woman is facing north. She turns 90° clockwise, then 180°, then 90° anticlockwise. Which direction is she facing now?
    (a) South (b) North (c) East (d) West
16. A is three times as old as B. Nine years ago, A was twelve times as old as B. Find B's present age.
    (a) 11 years (b) 13 years (c) 9 years (d) 15 years
17. Find the missing number in the series: 20, 42, 86, 174, ?
    (a) 350 (b) 346 (c) 354 (d) 342
18. Which of the following is not a multiple of 15: 135, 150, 155, 165?
    (a) 155 (b) 135 (c) 150 (d) 165
19. Fourteen colleagues sit in a row facing north. S sits at the right end. T sits immediately to the left of S. U sits tenth to the left of T. How many colleagues sit to the left of U?
    (a) 2 (b) 3 (c) 1 (d) 4
20. Statements: All patrol vans are marked vehicles. Everything marked is easily identifiable. Conclusion: All patrol vans are easily identifiable. 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: 9, 21, 45, 93, ?
    (a) 189 (b) 186 (c) 192 (d) 183
22. In the analogy "Baker is to Bread as Potter is to ___," the missing word is:
    (a) Pot (b) Clay (c) Wheel (d) Kiln
23. In a code, WINTER is coded as XJOUFS (each letter shifted one place forward). How is VICTORY coded using the same rule?
    (a) WJDUPSZ (b) WJDUPSY (c) VJDUPSZ (d) WJDVPSZ
24. In a row of 120 people, Shreya is 52nd from the left. What is her position from the right?
    (a) 69th (b) 68th (c) 70th (d) 67th
25. Statements: All patrol dogs undergo training. No trained dog is unpredictable. Conclusion: No patrol dog is unpredictable. 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)

26. Who was the first Indian to be appointed Governor of the Reserve Bank of India?
    (a) C.D. Deshmukh (b) Osborne Smith (c) Benegal Rama Rau (d) Manmohan Singh
27. Which Article of the Indian Constitution provides for the establishment of Panchayats?
    (a) Article 40 (b) Article 21 (c) Article 19 (d) Article 32
28. Which Indian city is known as the "Solar City of India"?
    (a) Kota (b) Jodhpur (c) Bikaner (d) Ajmer
29. The Indian National Army trials were held at which fort?
    (a) Red Fort (b) Golconda Fort (c) Gwalior Fort (d) Chittorgarh Fort
30. Which is the largest elephant reserve in India?
    (a) Nilgiri Elephant Reserve (b) Mysore Elephant Reserve (c) Wayanad Elephant Reserve (d) Kaziranga Elephant Reserve
31. Who was the Viceroy of India when the Government of India Act, 1935, was passed?
    (a) Lord Willingdon (b) Lord Linlithgow (c) Lord Wavell (d) Lord Irwin
32. The Bhilai Steel Plant was set up with the assistance of which country?
    (a) Soviet Union (b) United Kingdom (c) Germany (d) United States
33. Which is the highest peacetime gallantry award given for acts of bravery away from the battlefield?
    (a) Ashoka Chakra (b) Param Vir Chakra (c) Maha Vir Chakra (d) Vir Chakra
34. Who was the Vice-President of the Constituent Assembly of India?
    (a) H.C. Mukherjee (b) B.R. Ambedkar (c) Jawaharlal Nehru (d) Sardar Patel
35. Which Indian state has one of the largest numbers of registered self-help groups among Indian states?
    (a) Andhra Pradesh (b) Tamil Nadu (c) Kerala (d) Karnataka
36. The Muslim League was founded in which year?
    (a) 1906 (b) 1885 (c) 1916 (d) 1940
37. Which Indian award recognises excellence in classical and folk arts, given by the Sangeet Natak Akademi?
    (a) Sangeet Natak Akademi Award (b) Padma Shri (c) Bharat Ratna (d) Jnanpith Award
38. Who was the first Chief Minister of Assam?
    (a) Gopinath Bordoloi (b) Bimala Prasad Chaliha (c) Mahendra Mohan Choudhury (d) Sarat Chandra Sinha
39. Which Indian city is known as the "Financial Hub of India"?
    (a) Mumbai (b) Delhi (c) Kolkata (d) Chennai
40. The Battle of Samugarh, a decisive battle in the Mughal war of succession, was fought in which year?
    (a) 1658 (b) 1526 (c) 1556 (d) 1707
41. Which is one of the largest artificial forests planted through afforestation drives in the Thar Desert region?
    (a) Aravalli plantation belts (b) Sundarbans (c) Gir Forest (d) Corbett Forest
42. Who founded the Hindu Mahasabha?
    (a) Madan Mohan Malaviya (b) V.D. Savarkar (c) Bal Gangadhar Tilak (d) Lala Lajpat Rai
43. Which is one of the highest-altitude motorable passes in the world, located in Ladakh?
    (a) Khardung La (b) Nathu La (c) Rohtang Pass (d) Zoji La
44. The Vernacular Press Act, which restricted the freedom of the Indian-language press, was repealed in which year?
    (a) 1882 (b) 1878 (c) 1919 (d) 1935
45. Which Indian state celebrates the "Durga Puja" festival with particular grandeur?
    (a) West Bengal (b) Odisha (c) Bihar (d) Assam
46. Who became the first Indian to win an Olympic medal in javelin throw?
    (a) Neeraj Chopra (b) Milkha Singh (c) P.T. Usha (d) Anju Bobby George
47. Which strait separates the North and South Andaman Islands?
    (a) Austin Strait (b) Duncan Passage (c) Ten Degree Channel (d) Coco Channel
48. Who founded the Anushilan Samiti, an early revolutionary organisation?
    (a) Barindra Kumar Ghosh and P. Mitra (b) Bhagat Singh (c) Chandrashekhar Azad (d) Khudiram Bose
49. Which Indian city hosted the 2011 Cricket World Cup final?
    (a) Mumbai (b) Kolkata (c) Chennai (d) New Delhi
50. The "Radcliffe Line" refers to:
    (a) The boundary demarcating India and Pakistan at partition (b) The Line of Control in Kashmir (c) The McMahon Line with China (d) The international date line
51. Which Indian state has one of the largest numbers of registered agricultural universities among Indian states?
    (a) Uttar Pradesh (b) Punjab (c) Tamil Nadu (d) Maharashtra
52. Who wrote the epic "Padmavat" in Awadhi?
    (a) Malik Muhammad Jayasi (b) Amir Khusrau (c) Kabir (d) Tulsidas
53. Which is the largest river delta in the world, shared between India and Bangladesh?
    (a) Sundarbans/Ganges-Brahmaputra Delta (b) Godavari Delta (c) Krishna Delta (d) Mahanadi Delta
54. India's first general election under universal adult suffrage was held in which year?
    (a) 1951–52 (b) 1947 (c) 1950 (d) 1957
55. Which Indian state is the largest producer of coconuts?
    (a) Kerala (b) Tamil Nadu (c) Karnataka (d) Andhra Pradesh
56. Who was the first Indian to become an International Chess Grandmaster?
    (a) Viswanathan Anand (b) Pentala Harikrishna (c) Koneru Humpy (d) R. Praggnanandhaa
57. Which Indian city is known as the "Automobile Hub of India"?
    (a) Chennai (b) Pune (c) Gurugram (d) Manesar
58. The "Ayushman Bharat" scheme is administered by which ministry?
    (a) Ministry of Health and Family Welfare (b) Ministry of Rural Development (c) Ministry of Finance (d) Ministry of Home Affairs
59. Which Indian state is home to well-known hill stations such as Shimla, Manali, and Dharamshala?
    (a) Himachal Pradesh (b) Uttarakhand (c) Jammu and Kashmir (d) Sikkim
60. Who was the Prime Minister of India during the liberalisation reforms of 1991?
    (a) P.V. Narasimha Rao (b) Rajiv Gandhi (c) V.P. Singh (d) Chandra Shekhar
61. Which is the highest peak of the Karakoram Range within Indian-administered territory?
    (a) Saltoro Kangri (b) K2 (c) Nanda Devi (d) Kangchenjunga
62. The "PM-KISAN" scheme provides direct income support to:
    (a) Small and marginal farmers (b) Urban workers (c) Students (d) Senior citizens
63. Which Indian classical dance form is traditionally performed as a solo dance in temples of Kerala?
    (a) Mohiniyattam (b) Kathak (c) Odissi (d) Manipuri
64. Who founded the "Abhinav Bharat Society," a revolutionary organisation?
    (a) V.D. Savarkar (b) Bhagat Singh (c) Chandrashekhar Azad (d) Khudiram Bose
65. Which is the largest producer of tapioca among Indian states?
    (a) Tamil Nadu (b) Kerala (c) Andhra Pradesh (d) Karnataka
66. The "Cripps Mission" proposal was ultimately rejected primarily because it deferred:
    (a) Full self-government until after the war (b) Provincial autonomy (c) Dyarchy (d) The Communal Award
67. Which Indian state has one of the largest numbers of registered veterinary colleges among Indian states?
    (a) Uttar Pradesh (b) Punjab (c) Tamil Nadu (d) Karnataka
68. Who is considered the founder of the "Radical Humanism" philosophy in India?
    (a) M.N. Roy (b) Jayaprakash Narayan (c) Ram Manohar Lohia (d) Acharya Narendra Dev
69. Which is the largest producer of pineapples among Indian states?
    (a) West Bengal (b) Assam (c) Karnataka (d) Kerala
70. The "Wardha Scheme of Education," proposed by Gandhi, emphasised:
    (a) Learning through productive, craft-based work (b) Purely theoretical education (c) English-medium instruction (d) Military training
71. Which Indian state is the largest producer of betel leaves (paan)?
    (a) West Bengal (b) Bihar (c) Odisha (d) Andhra Pradesh
72. Who composed "Raghuvamsa," a Sanskrit epic poem?
    (a) Kalidasa (b) Banabhatta (c) Bhasa (d) Vishakhadatta
73. Which is the largest producer of litchis among Indian states?
    (a) Bihar (b) West Bengal (c) Uttar Pradesh (d) Jharkhand
74. The "Simon Commission" was boycotted primarily because:
    (a) It had no Indian members (b) It proposed complete independence too soon (c) It abolished the princely states (d) It reduced provincial powers
75. Which Indian city is known as the "Pharma Capital of India"?
    (a) Hyderabad (b) Mumbai (c) Ahmedabad (d) Vadodara

Section C: Numerical Ability (Q76–90)

76. Simplify: 210 ÷ 14 + 16 × 2 − 22.
    (a) 25 (b) 23 (c) 27 (d) 21
77. A sum of ₹52,000 amounts to ₹67,600 in 3 years at simple interest. Find the rate of interest per annum.
    (a) 10% (b) 8% (c) 12% (d) 9%
78. The ratio of two numbers is 11:14. If their sum is 200, find the larger number.
    (a) 112 (b) 108 (c) 116 (d) 104
79. A shopkeeper buys an article for ₹1,680 and sells it for ₹2,100. Find the profit percentage.
    (a) 25% (b) 20% (c) 30% (d) 15%
80. Find the average of the first sixty-five natural numbers.
    (a) 33 (b) 32.5 (c) 33.5 (d) 32
81. A train 400 m long crosses a pole in 40 seconds. Find its speed in km/h.
    (a) 36 km/h (b) 30 km/h (c) 40 km/h (d) 45 km/h
82. If the cost price of 75 articles equals the selling price of 60 articles, find the profit percentage.
    (a) 25% (b) 20% (c) 30% (d) 15%
83. Find the value of: 80% of 100 + 40% of 150.
    (a) 140 (b) 135 (c) 145 (d) 130
84. A and B together can complete a piece of work in 6 days. A alone can do it in 10 days. In how many days can B alone complete it?
    (a) 15 days (b) 14 days (c) 16 days (d) 13 days
85. Find the compound interest on ₹1,00,000 at 5% per annum for 2 years, compounded annually.
    (a) ₹10,250 (b) ₹10,000 (c) ₹10,500 (d) ₹9,750
86. Solve for x: 16(x − 13) = 9x − 5.
    (a) 29 (b) 28 (c) 30 (d) 27
87. Find the area of a circle with radius 63 cm (use π = 22/7).
    (a) 12,474 sq cm (b) 12,400 sq cm (c) 12,500 sq cm (d) 12,300 sq cm
88. A boat's speed in still water is 30 km/h; stream speed is 6 km/h. Find the time to cover 216 km downstream.
    (a) 6 hours (b) 6.5 hours (c) 5.5 hours (d) 7 hours
89. Find the missing number in the series: 40, 80, 160, 320, ?
    (a) 640 (b) 630 (c) 650 (d) 620
90. A sum of ₹2,20,000 is divided between A and B such that A's share is 350% more than B's. Find B's share.
    (a) ₹40,000 (b) ₹38,000 (c) ₹42,000 (d) ₹36,000

Section D: Computer Knowledge (Q91–100)

91. Which of the following is used to insert external images and documents into a computer via optical scanning?
    (a) Scanner (b) Printer (c) Speaker (d) Monitor
92. What does "URL" stand for?
    (a) Uniform Resource Locator (b) Universal Resource Link (c) Uniform Reference Locator (d) Universal Reference Link
93. Which of the following is used to create flowcharts and diagrams?
    (a) Diagramming software (b) MS Word (c) MS Excel (d) MS Access
94. What is the full form of "3G/4G/5G" in mobile networks?
    (a) Third/Fourth/Fifth Generation (b) Third/Fourth/Fifth Gigabyte (c) Third/Fourth/Fifth Grid (d) Third/Fourth/Fifth Gateway
95. Which key combination is used to close the currently active window?
    (a) Alt+F4 (b) Ctrl+F4 (c) Shift+F4 (d) Windows key+F4
96. Which of the following is an example of an instant messaging application?
    (a) WhatsApp (b) MS Word (c) MS Excel (d) Adobe Reader
97. What does "LTE" stand for in mobile telecommunications?
    (a) Long Term Evolution (b) Long Transmission Evolution (c) Local Transfer Enhancement (d) Long Term Enhancement
98. Which of the following is used to prevent a computer from overheating?
    (a) A cooling fan or heat sink (b) A word processor (c) A spreadsheet (d) A web browser
99. What does "SEO" stand for in the context of websites?
    (a) Search Engine Optimisation (b) Search Engine Operation (c) System Engine Optimisation (d) System Engine Operation
100. Which of the following is used to physically point to and select items via hand gestures instead of a mouse?
     (a) A touchscreen (b) A keyboard (c) A printer (d) A scanner

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Answer Key with Explanations

Section A:

1.(a) A postman delivers a letter, just as a courier delivers a parcel.

2.(a) Each term is multiplied by 4: 5×4=20, 20×4=80, 80×4=320, 320×4=1280.

3.(a) Diamond, ruby, and emerald are precious gemstones, while marble is a type of rock, making it the odd one out.

4.(a) Each letter shifts one place forward: O+1=P, C+1=D, E+1=F, A+1=B, N+1=O, giving PDFBO.

5.(a) By the Pythagorean theorem, distance = √(9²+40²) = √(81+1600) = √1681 = 41 km.

6.(a) S is R's father, and Q is R's mother, so Q is S's wife.

7.(a) The gaps increase by one each time: L(12)+3=O(15), O+4=S(19), S+5=X(24), X+6=AD(30).

8.(a) Since G≥H>I≥J, it follows directly that G≥J.

9.(a) Rank from the bottom = 90 − 40 + 1 = 51st.

10.(a) Following the order of operations: 132÷11=12, 12×6=72, 72+40=112, 112−25=87.

11.(a) P is at the left end (position 1); Q is immediately right of P (position 2); R is eleventh to the right of Q, so R is at position 2+11=13; with sixteen people in the row, 3 people sit to the right of R.

12.(a) No, this does not necessarily follow: the "some supervisors" who are trainers may or may not include the specific supervisors who are monitors.

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) Each term is multiplied by 0.9: 1000×0.9=900, 900×0.9=810, 810×0.9=729, 729×0.9=656.1.

15.(a) The net turn is 90° clockwise plus 180° minus 90° (the anticlockwise turn), which equals 180° overall; facing north, a 180° turn gives south.

16.(a) Let B's present age be x and A's be 3x; nine years ago, 3x−9 = 12(x−9), giving 3x−9 = 12x−108, so 9x=99, x=11.

17.(a) Each term follows ×2+2: 20×2+2=42, 42×2+2=86, 86×2+2=174, 174×2+2=350.

18.(a) 135, 150, and 165 are multiples of 15, while 155 is not.

19.(a) S is at the right end (position 14); T is immediately left of S (position 13); U is tenth to the left of T, so U is at position 13−10=3; 2 colleagues sit to the left of U (positions 1 and 2).

20.(a) Yes, this follows validly: all patrol vans are marked vehicles, and everything marked is easily identifiable, so all patrol vans are easily identifiable.

21.(a) Each term follows ×2+3: 9×2+3=21, 21×2+3=45, 45×2+3=93, 93×2+3=189.

22.(a) A baker makes bread, just as a potter makes pots.

23.(a) Each letter shifts one place forward: V+1=W, I+1=J, C+1=D, T+1=U, O+1=P, R+1=S, Y+1=Z, giving WJDUPSZ.

24.(a) Position from the right = 120 − 52 + 1 = 69th.

25.(a) Yes, this follows validly: all patrol dogs undergo training, and no trained dog is unpredictable, so no patrol dog is unpredictable.

Section B:

26.(a) C.D. Deshmukh was the first Indian to be appointed Governor of the Reserve Bank of India.

27.(a) Article 40 provides for the establishment of Panchayats.

28.(a) Kota is known for its notable solar energy initiatives among Rajasthan's cities, often cited as a "Solar City."

29.(a) The Indian National Army trials were held at the Red Fort.

30.(a) The Nilgiri Elephant Reserve is one of the largest elephant reserves in India.

31.(a) Lord Willingdon was the Viceroy of India when the Government of India Act, 1935, was passed.

32.(a) The Bhilai Steel Plant was set up with the assistance of the Soviet Union.

33.(a) The Ashoka Chakra is the highest peacetime gallantry award for bravery away from the battlefield.

34.(a) H.C. Mukherjee was the Vice-President of the Constituent Assembly of India.

35.(a) Andhra Pradesh has one of the largest numbers of registered self-help groups among Indian states.

36.(a) The Muslim League was founded in 1906.

37.(a) The Sangeet Natak Akademi Award recognises excellence in classical and folk arts.

38.(a) Gopinath Bordoloi was the first Chief Minister of Assam.

39.(a) Mumbai is known as the "Financial Hub of India."

40.(a) The Battle of Samugarh was fought in 1658.

41.(a) Afforestation plantation belts in the Aravallis represent notable man-made forest cover near the Thar Desert region.

42.(a) V.D. Savarkar founded the Hindu Mahasabha.

43.(a) Khardung La is one of the highest-altitude motorable passes in the world, located in Ladakh.

44.(a) The Vernacular Press Act was repealed in 1882.

45.(a) West Bengal celebrates the "Durga Puja" festival with particular grandeur.

46.(a) Neeraj Chopra became the first Indian to win an Olympic gold medal in javelin throw, at the 2020 Tokyo Olympics.

47.(a) The Austin Strait separates the North and South Andaman Islands.

48.(a) Barindra Kumar Ghosh and P. Mitra founded the Anushilan Samiti.

49.(a) Mumbai hosted the 2011 Cricket World Cup final.

50.(a) The "Radcliffe Line" refers to the boundary demarcating India and Pakistan at partition.

51.(a) Punjab has one of the largest numbers of registered agricultural universities among Indian states.

52.(a) Malik Muhammad Jayasi wrote the epic "Padmavat" in Awadhi.

53.(a) The Sundarbans, part of the Ganges-Brahmaputra Delta, is the largest river delta in the world.

54.(a) India's first general election under universal adult suffrage was held in 1951–52.

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

56.(a) Viswanathan Anand was the first Indian to become an International Chess Grandmaster.

57.(a) Chennai is known as the "Automobile Hub of India."

58.(a) The "Ayushman Bharat" scheme is administered by the Ministry of Health and Family Welfare.

59.(a) Himachal Pradesh is home to well-known hill stations such as Shimla, Manali, and Dharamshala.

60.(a) P.V. Narasimha Rao was the Prime Minister of India during the liberalisation reforms of 1991.

61.(a) Saltoro Kangri is the highest peak of the Karakoram Range within Indian-administered territory.

62.(a) The "PM-KISAN" scheme provides direct income support to small and marginal farmers.

63.(a) Mohiniyattam is traditionally performed as a solo dance in temples of Kerala.

64.(a) V.D. Savarkar founded the "Abhinav Bharat Society."

65.(a) Tamil Nadu is one of the largest producers of tapioca among Indian states.

66.(a) The Cripps Mission proposal was rejected primarily because it deferred full self-government until after the war.

67.(a) Uttar Pradesh has one of the largest numbers of registered veterinary colleges among Indian states.

68.(a) M.N. Roy is considered the founder of the "Radical Humanism" philosophy in India.

69.(a) West Bengal is one of the largest producers of pineapples among Indian states.

70.(a) The "Wardha Scheme of Education" emphasised learning through productive, craft-based work.

71.(a) West Bengal is a leading producer of betel leaves (paan) among Indian states.

72.(a) Kalidasa composed "Raghuvamsa."

73.(a) Bihar is the largest producer of litchis among Indian states.

74.(a) The Simon Commission was boycotted primarily because it had no Indian members.

75.(a) Hyderabad is known as the "Pharma Capital of India."

Section C:

76.(a) 210÷14=15; 16×2=32; 15+32−22=25.

77.(a) Interest = 67,600−52,000 = ₹15,600 over 3 years; rate = (15,600×100)/(52,000×3) = 10%.

78.(a) The parts total 11+14=25; larger number = 200×14/25 = 112.

79.(a) Profit = 2,100−1,680 = ₹420; profit percentage = (420/1,680)×100 = 25%.

80.(a) The first sixty-five natural numbers sum to 2,145; average = 2,145/65 = 33.

81.(a) Speed = 400 m / 40 s = 10 m/s = 10×18/5 = 36 km/h.

82.(a) If CP of 75 articles equals SP of 60 articles, SP/CP per article = 75/60 = 1.25, a profit of 25%.

83.(a) 80% of 100 = 80; 40% of 150 = 60; sum = 140.

84.(a) Combined rate = 1/6; A's rate = 1/10; B's rate = 1/6−1/10 = 5/30−3/30 = 2/30 = 1/15, so B alone takes 15 days.

85.(a) Amount = 1,00,000×(1.05)² = 1,10,250; compound interest = ₹10,250.

86.(a) 16(x−13)=9x−5 gives 16x−208=9x−5, so 7x=203, x=29.

87.(a) Area = (22/7)×63² = 22×567 = 12,474 sq cm.

88.(a) Downstream speed = 30+6 = 36 km/h; time = 216/36 = 6 hours.

89.(a) Each term doubles: 40×2=80, 80×2=160, 160×2=320, 320×2=640.

90.(a) A's share is 4.5 times B's (350% more), so 5.5 parts = 2,20,000, giving B's share = ₹40,000.

Section D:

91.(a) A scanner is used to insert external images and documents into a computer via optical scanning.

92.(a) URL stands for Uniform Resource Locator.

93.(a) Diagramming software is used to create flowcharts and diagrams.

94.(a) "G" in 3G/4G/5G stands for Generation.

95.(a) Alt+F4 is used to close the currently active window.

96.(a) WhatsApp is an example of an instant messaging application.

97.(a) LTE stands for Long Term Evolution.

98.(a) A cooling fan or heat sink is used to prevent a computer from overheating.

99.(a) SEO stands for Search Engine Optimisation.

100.(a) A touchscreen is used to physically point to and select items via hand gestures instead of a mouse.