Mock Test 4 — 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 "Fish is to Water as Bird is to ___," the missing word is:
   (a) Sky (b) Nest (c) Tree (d) Feather
2. Find the missing number in the series: 6, 12, 24, 48, ?
   (a) 96 (b) 90 (c) 100 (d) 84
3. Which one does not belong with the others: Potato, Mango, Apple, Banana?
   (a) Potato (b) Mango (c) Apple (d) Banana
4. In a code, TIGER is coded as VKIGT (each letter shifted two places forward). How is LION coded using the same rule?
   (a) NKQP (b) NKQO (c) MKQP (d) NLQP
5. A man walks 5 km south, then 12 km east. How far is he from his starting point?
   (a) 13 km (b) 15 km (c) 17 km (d) 12 km
6. P is Q's mother. R is Q's son. How is P related to R?
   (a) Grandmother (b) Mother (c) Aunt (d) Sister
7. In the letter series C, F, J, O, ?, what is the next letter (gaps +3, +4, +5, next +6)?
   (a) U (b) T (c) V (d) S
8. Given: P ≥ Q > R ≥ S. Which of the following must be true?
   (a) P ≥ S (b) S > P (c) Q < S (d) R > P
9. In a class of 60 students, Ananya ranks 25th from the bottom. What is her rank from the top?
   (a) 36th (b) 35th (c) 37th (d) 34th
10. If '@' denotes '+', '#' denotes '−', '%' denotes '×', and '$' denotes '÷', evaluate: 42 $ 6 % 5 @ 8 # 3.
    (a) 40 (b) 38 (c) 42 (d) 36
11. Seven people sit in a row facing north. F sits at the right end. G sits immediately to the left of F. H sits third to the left of G. How many people sit to the left of H?
    (a) 2 (b) 3 (c) 1 (d) 4
12. Statements: All apples are fruits. Some fruits are sweet. Conclusion: Some apples are sweet. Does this conclusion necessarily follow?
    (a) No, it does not necessarily follow (b) Yes, it follows validly (c) Only if all fruits are apples (d) Cannot be determined
13. In a code, BRAIN is coded by each letter's position in the alphabet as 2-18-1-9-14. How is CHAIR coded using the same rule?
    (a) 3-8-1-9-18 (b) 3-8-1-9-19 (c) 2-8-1-9-18 (d) 3-9-1-9-18
14. Find the missing number in the series: 200, 182, 166, 152, ?
    (a) 140 (b) 138 (c) 142 (d) 136
15. A man is facing west. He turns 90° anticlockwise, then 90° anticlockwise again. Which direction is he facing now?
    (a) East (b) West (c) North (d) South
16. A is six times as old as B. Four years ago, A was twenty-six times as old as B. Find B's present age.
    (a) 5 years (b) 6 years (c) 4 years (d) 7 years
17. Find the missing number in the series: 12, 25, 51, 103, ?
    (a) 207 (b) 206 (c) 208 (d) 205
18. Which of the following is not a perfect square: 75, 49, 64, 81?
    (a) 75 (b) 49 (c) 64 (d) 81
19. Five students J, K, L, M, N sit in a row facing north, numbered 1 to 5 from the left. J sits at position 2. K sits immediately to the right of J. L sits at the left end (position 1). M sits immediately to the left of N. Where does N sit?
    (a) 5th from the left (b) 4th from the left (c) 1st from the left (d) 3rd from the left
20. Statements: All rupee notes are legal tender. All legal tender is accepted for payment. Conclusion: All rupee notes are accepted for payment. 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: 7, 16, 34, 70, ?
    (a) 142 (b) 140 (c) 144 (d) 138
22. In the analogy "Author is to Book as Sculptor is to ___," the missing word is:
    (a) Sculpture (b) Chisel (c) Museum (d) Clay
23. In a code, LEMON is coded as MFNPO (each letter shifted one place forward). How is ORANGE coded using the same rule?
    (a) PSBOHF (b) PSBOGF (c) OSBOHF (d) PSBPHF
24. In a row of 55 people, Tanya is 20th from the left. What is her position from the right?
    (a) 36th (b) 35th (c) 37th (d) 34th
25. Statements: All police stations are government offices. No government office is closed on duty days. Conclusion: No police station is closed on duty days. 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 is known as the "Iron Man of India"?
    (a) Sardar Vallabhbhai Patel (b) Jawaharlal Nehru (c) Subhas Chandra Bose (d) Bhagat Singh
27. The Quit India Movement was launched in which year?
    (a) 1942 (b) 1930 (c) 1920 (d) 1947
28. Which is the largest state in India by area?
    (a) Rajasthan (b) Madhya Pradesh (c) Maharashtra (d) Uttar Pradesh
29. Who composed India's national song, "Vande Mataram"?
    (a) Bankim Chandra Chatterjee (b) Rabindranath Tagore (c) Sarojini Naidu (d) Muhammad Iqbal
30. Which Indian city is known as the "Manchester of India"?
    (a) Ahmedabad (b) Surat (c) Kanpur (d) Coimbatore
31. The Simon Commission visited India in which year?
    (a) 1928 (b) 1919 (c) 1935 (d) 1942
32. Which is the largest freshwater lake in India?
    (a) Wular Lake (b) Dal Lake (c) Chilika Lake (d) Sambhar Lake
33. Who was the first Governor-General of independent India?
    (a) Lord Mountbatten (b) C. Rajagopalachari (c) Lord Wavell (d) Lord Curzon
34. Which Indian state is the largest producer of rice?
    (a) West Bengal (b) Punjab (c) Uttar Pradesh (d) Andhra Pradesh
35. The Chipko Movement was primarily concerned with:
    (a) Forest conservation (b) Water conservation (c) Wildlife protection (d) Soil conservation
36. Who was the founder of the Maurya Empire?
    (a) Chandragupta Maurya (b) Ashoka (c) Bindusara (d) Samudragupta
37. Which country recently surpassed China to become the world's most populous nation?
    (a) India (b) Indonesia (c) Pakistan (d) Nigeria
38. Which Indian scientist is known for his contribution to the Chandrasekhar limit in astrophysics?
    (a) Subrahmanyan Chandrasekhar (b) C.V. Raman (c) Homi Bhabha (d) Vikram Sarabhai
39. The Vijayanagara Empire was founded in which century?
    (a) 14th century (b) 12th century (c) 16th century (d) 10th century
40. Which is the national animal of India?
    (a) Royal Bengal Tiger (b) Lion (c) Elephant (d) Leopard
41. Who is the author of the book "Wings of Fire"?
    (a) A.P.J. Abdul Kalam (b) Amartya Sen (c) Shashi Tharoor (d) Chetan Bhagat
42. Which Indian state was formed most recently, in 2014?
    (a) Telangana (b) Chhattisgarh (c) Jharkhand (d) Uttarakhand
43. The Sarvodaya Movement in India is most closely associated with which leader?
    (a) Vinoba Bhave (b) Jayaprakash Narayan (c) Mahatma Gandhi (d) Rajendra Prasad
44. Which Indian bank was formed in 1955 by converting the Imperial Bank of India?
    (a) State Bank of India (b) Punjab National Bank (c) Bank of Baroda (d) Canara Bank
45. The national bird of India is:
    (a) Peacock (b) Parrot (c) Sparrow (d) Crane
46. Which Indian freedom fighter founded the Indian National Army (INA)?
    (a) Subhas Chandra Bose (b) Bhagat Singh (c) Chandrashekhar Azad (d) Lala Lajpat Rai
47. Which is the highest mountain peak located entirely within India?
    (a) Kangchenjunga (b) Nanda Devi (c) K2 (d) Mount Everest
48. The Rowlatt Act was passed in which year?
    (a) 1919 (b) 1909 (c) 1929 (d) 1935
49. Which Indian city is regarded as the financial capital of India?
    (a) Mumbai (b) Delhi (c) Kolkata (d) Chennai
50. Who was the first woman President of India?
    (a) Pratibha Patil (b) Droupadi Murmu (c) Sonia Gandhi (d) Indira Gandhi
51. The Sepoy Mutiny (First War of Independence) took place in which year?
    (a) 1857 (b) 1885 (c) 1919 (d) 1942
52. Which is the national flower of India?
    (a) Lotus (b) Rose (c) Marigold (d) Jasmine
53. The "Gateway of India" monument is located in which city?
    (a) Mumbai (b) Delhi (c) Kolkata (d) Chennai
54. Which Indian state is known as "God's Own Country"?
    (a) Kerala (b) Goa (c) Sikkim (d) Meghalaya
55. Who was the last Mughal emperor?
    (a) Bahadur Shah Zafar (b) Shah Alam II (c) Aurangzeb (d) Akbar II
56. The Reserve Bank of India's central board is headed by:
    (a) The Governor (b) The Finance Minister (c) The Prime Minister (d) The President
57. Which is the longest National Highway in India?
    (a) National Highway 44 (b) National Highway 48 (c) National Highway 1 (d) National Highway 27
58. The First Battle of Panipat was fought in which year?
    (a) 1526 (b) 1556 (c) 1761 (d) 1707
59. Which Indian state has the highest literacy rate?
    (a) Kerala (b) Mizoram (c) Goa (d) Tripura
60. The Preamble of the Indian Constitution declares India to be a:
    (a) Sovereign Socialist Secular Democratic Republic (b) Sovereign Democratic Republic only (c) Federal Socialist Republic (d) Sovereign Secular Republic only
61. Which Indian city hosts the International Film Festival of India (IFFI) annually?
    (a) Goa (b) Mumbai (c) Delhi (d) Chennai
62. The word "Chipko" literally means:
    (a) To hug or embrace (b) To cut (c) To plant (d) To protect
63. Which is the largest river island in India, located in Assam?
    (a) Majuli (b) Sagar Island (c) Elephanta Island (d) Diu
64. The Poona Pact of 1932 was an agreement between:
    (a) Mahatma Gandhi and B.R. Ambedkar (b) Nehru and Jinnah (c) Gandhi and Jinnah (d) Ambedkar and Nehru
65. Which Indian state is the largest producer of sugarcane?
    (a) Uttar Pradesh (b) Maharashtra (c) Karnataka (d) Tamil Nadu
66. The Non-Cooperation Movement was launched by Gandhi in which year?
    (a) 1920 (b) 1930 (c) 1942 (d) 1919
67. Which is the largest ocean in the world?
    (a) Pacific Ocean (b) Atlantic Ocean (c) Indian Ocean (d) Arctic Ocean
68. Who designed the Indian national flag?
    (a) Pingali Venkayya (b) Rabindranath Tagore (c) B.R. Ambedkar (d) Jawaharlal Nehru
69. Which Indian metro system was the first in the country to operate driverless trains?
    (a) Delhi Metro (b) Mumbai Metro (c) Kolkata Metro (d) Bengaluru Metro
70. The Indian Army Day is celebrated on:
    (a) 15 January (b) 26 January (c) 15 August (d) 14 January
71. The Kumbh Mela, a major Hindu religious gathering, is held rotationally at four locations, including which Uttar Pradesh city?
    (a) Prayagraj (b) Lucknow (c) Varanasi (d) Kanpur
72. Who is regarded as the political architect of India's Five-Year Plans as Prime Minister?
    (a) Jawaharlal Nehru (b) Sardar Patel (c) B.R. Ambedkar (d) Rajendra Prasad
73. Which is the busiest airport in India by passenger traffic?
    (a) Indira Gandhi International Airport, Delhi (b) Chhatrapati Shivaji Maharaj International Airport, Mumbai (c) Kempegowda International Airport, Bengaluru (d) Chennai International Airport
74. India's "Look East Policy" was renamed to which policy in 2014?
    (a) Act East Policy (b) Neighbourhood First Policy (c) Look West Policy (d) Gujral Doctrine
75. Who won India's first individual Olympic gold medal, at the 2008 Beijing Olympics?
    (a) Abhinav Bindra (b) Neeraj Chopra (c) Rajyavardhan Singh Rathore (d) Vijender Singh

Section C: Numerical Ability (Q76–90)

76. Simplify: 96 ÷ 8 + 7 × 6 − 15.
    (a) 39 (b) 38 (c) 40 (d) 37
77. A sum of ₹25,000 amounts to ₹32,500 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 5:8. If their sum is 130, find the larger number.
    (a) 80 (b) 75 (c) 85 (d) 70
79. A shopkeeper buys an article for ₹450 and sells it for ₹540. Find the profit percentage.
    (a) 20% (b) 15% (c) 25% (d) 18%
80. Find the average of the first twenty natural numbers.
    (a) 10.5 (b) 10 (c) 11 (d) 9.5
81. A train 180 m long crosses a pole in 18 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 30 articles equals the selling price of 24 articles, find the profit percentage.
    (a) 25% (b) 20% (c) 30% (d) 15%
83. Find the value of: 30% of 250 + 15% of 200.
    (a) 105 (b) 100 (c) 110 (d) 95
84. A and B together can complete a piece of work in 18 days. A alone can do it in 30 days. In how many days can B alone complete it?
    (a) 45 days (b) 40 days (c) 50 days (d) 42 days
85. Find the compound interest on ₹15,000 at 10% per annum for 2 years, compounded annually.
    (a) ₹3,150 (b) ₹3,000 (c) ₹3,300 (d) ₹2,900
86. Solve for x: 9(x − 5) = 5x + 7.
    (a) 13 (b) 12 (c) 14 (d) 11
87. Find the area of a rectangle with length 20 cm and breadth 12 cm.
    (a) 240 sq cm (b) 220 sq cm (c) 230 sq cm (d) 250 sq cm
88. A boat's speed in still water is 35 km/h; stream speed is 7 km/h. Find the time to cover 168 km downstream.
    (a) 4 hours (b) 4.5 hours (c) 3.5 hours (d) 5 hours
89. Find the missing number in the series: 8, 16, 32, 64, ?
    (a) 128 (b) 124 (c) 130 (d) 126
90. A sum of ₹90,000 is divided between A and B such that A's share is 50% more than B's. Find B's share.
    (a) ₹36,000 (b) ₹34,000 (c) ₹38,000 (d) ₹32,000

Section D: Computer Knowledge (Q91–100)

91. Which of the following is a secondary storage device?
    (a) Hard disk (b) RAM (c) Cache (d) Register
92. What does "LAN" stand for?
    (a) Local Area Network (b) Large Area Network (c) Local Access Network (d) Limited Area Network
93. Which of the following is used to create spreadsheets?
    (a) MS Excel (b) MS Word (c) MS PowerPoint (d) MS Paint
94. What is the full form of "CD-ROM"?
    (a) Compact Disc Read-Only Memory (b) Compact Disc Random-Only Memory (c) Compact Data Read-Only Memory (d) Compact Disc Read-Only Module
95. Which key combination is used to switch between open windows on Windows?
    (a) Alt+Tab (b) Ctrl+Tab (c) Shift+Tab (d) Windows key+D
96. Which of the following is an example of a search engine?
    (a) Google (b) MS Word (c) MS Excel (d) Adobe Reader
97. What does "GUI" stand for?
    (a) Graphical User Interface (b) General User Interface (c) Graphical Unit Interface (d) General Unit Interface
98. Which feature is used to protect a document with a password?
    (a) The file encryption/password protection feature in the software (b) Antivirus (c) Firewall (d) Web browser
99. "Wi-Fi" enables a device to connect to a network without:
    (a) Physical cables (b) Electricity (c) A user account (d) An operating system
100. Which of the following is a valid computer file extension for an image?
     (a) .jpg (b) .exe (c) .txt (d) .mp3

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Answer Key with Explanations

Section A:

1.(a) A fish lives in water, just as a bird belongs in the sky.

2.(a) Each term doubles: 6×2=12, 12×2=24, 24×2=48, 48×2=96.

3.(a) Mango, apple, and banana are fruits, while a potato is a vegetable, making it the odd one out.

4.(a) Each letter shifts two places forward: L+2=N, I+2=K, O+2=Q, N+2=P, giving NKQP.

5.(a) By the Pythagorean theorem, distance = √(5²+12²) = √(25+144) = √169 = 13 km.

6.(a) P is Q's mother, and R is Q's son, so P is R's grandmother.

7.(a) The gaps increase by one each time: C(3)+3=F(6), F+4=J(10), J+5=O(15), O+6=U(21).

8.(a) Since P≥Q>R≥S, it follows directly that P≥S.

9.(a) Rank from the top = 60 − 25 + 1 = 36th.

10.(a) Following the order of operations: 42÷6=7, 7×5=35, 35+8=43, 43−3=40.

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

12.(a) No, this does not necessarily follow: the "some fruits" that are sweet may or may not include the specific fruits that are apples.

13.(a) Each letter is coded by its position in the alphabet; applying the same rule, CHAIR is coded as 3-8-1-9-18.

14.(a) The differences fall by 2 each time: 18, 16, 14, then 12; 152−12 = 140.

15.(a) Two successive 90° anticlockwise turns total 180°, so facing west becomes facing east.

16.(a) Let B's present age be x and A's be 6x; four years ago, 6x−4 = 26(x−4), giving 6x−4 = 26x−104, so 20x=100, x=5.

17.(a) Each term follows ×2+1: 12×2+1=25, 25×2+1=51, 51×2+1=103, 103×2+1=207.

18.(a) 49, 64, and 81 are perfect squares (7², 8², 9²), while 75 is not.

19.(a) L sits at position 1; J sits at position 2; K is immediately right of J, so K is at position 3; the remaining positions 4 and 5 go to M and N with M immediately left of N, so N sits at position 5.

20.(a) Yes, this follows validly: all rupee notes are legal tender, and all legal tender is accepted for payment, so all rupee notes are accepted for payment.

21.(a) Each term follows ×2+2: 7×2+2=16, 16×2+2=34, 34×2+2=70, 70×2+2=142.

22.(a) An author creates a book, just as a sculptor creates a sculpture.

23.(a) Each letter shifts one place forward: O+1=P, R+1=S, A+1=B, N+1=O, G+1=H, E+1=F, giving PSBOHF.

24.(a) Position from the right = 55 − 20 + 1 = 36th.

25.(a) Yes, this follows validly: all police stations are government offices, and no government office is closed on duty days, so no police station is closed on duty days.

Section B:

26.(a) Sardar Vallabhbhai Patel is known as the "Iron Man of India" for his role in unifying princely states.

27.(a) The Quit India Movement was launched in 1942.

28.(a) Rajasthan is the largest state in India by area.

29.(a) Bankim Chandra Chatterjee composed "Vande Mataram."

30.(a) Ahmedabad is known as the "Manchester of India" for its textile industry.

31.(a) The Simon Commission visited India in 1928.

32.(a) Wular Lake is the largest freshwater lake in India.

33.(a) Lord Mountbatten was the first Governor-General of independent India.

34.(a) West Bengal is the largest producer of rice among Indian states.

35.(a) The Chipko Movement was primarily concerned with forest conservation.

36.(a) Chandragupta Maurya founded the Maurya Empire.

37.(a) India recently surpassed China to become the world's most populous nation.

38.(a) Subrahmanyan Chandrasekhar is known for his contribution to the Chandrasekhar limit in astrophysics.

39.(a) The Vijayanagara Empire was founded in the 14th century.

40.(a) The Royal Bengal Tiger is the national animal of India.

41.(a) A.P.J. Abdul Kalam authored "Wings of Fire."

42.(a) Telangana was formed most recently, in 2014.

43.(a) The Sarvodaya Movement is most closely associated with Vinoba Bhave, who led the associated Bhoodan land-gift movement.

44.(a) The State Bank of India was formed in 1955 by converting the Imperial Bank of India.

45.(a) The Peacock is the national bird of India.

46.(a) Subhas Chandra Bose founded the Indian National Army (INA).

47.(a) Kangchenjunga is the highest mountain peak located entirely within India.

48.(a) The Rowlatt Act was passed in 1919.

49.(a) Mumbai is regarded as the financial capital of India.

50.(a) Pratibha Patil was the first woman President of India.

51.(a) The Sepoy Mutiny took place in 1857.

52.(a) The Lotus is the national flower of India.

53.(a) The "Gateway of India" monument is located in Mumbai.

54.(a) Kerala is known as "God's Own Country."

55.(a) Bahadur Shah Zafar was the last Mughal emperor.

56.(a) The Governor heads the Reserve Bank of India's central board.

57.(a) National Highway 44 is the longest National Highway in India.

58.(a) The First Battle of Panipat was fought in 1526.

59.(a) Kerala has the highest literacy rate among Indian states.

60.(a) The Preamble declares India to be a Sovereign Socialist Secular Democratic Republic.

61.(a) Goa hosts the International Film Festival of India (IFFI) annually.

62.(a) "Chipko" literally means to hug or embrace, referring to villagers embracing trees to prevent felling.

63.(a) Majuli, in Assam, is the largest river island in India.

64.(a) The Poona Pact of 1932 was an agreement between Mahatma Gandhi and B.R. Ambedkar.

65.(a) Uttar Pradesh is the largest producer of sugarcane among Indian states.

66.(a) The Non-Cooperation Movement was launched by Gandhi in 1920.

67.(a) The Pacific Ocean is the largest ocean in the world.

68.(a) Pingali Venkayya designed the Indian national flag.

69.(a) The Delhi Metro was the first in India to operate driverless trains.

70.(a) Indian Army Day is celebrated on 15 January.

71.(a) The Kumbh Mela is held rotationally at four locations, including Prayagraj in Uttar Pradesh.

72.(a) Jawaharlal Nehru is regarded as the political architect of India's Five-Year Plans as Prime Minister.

73.(a) Indira Gandhi International Airport, Delhi, is the busiest airport in India by passenger traffic.

74.(a) India's "Look East Policy" was renamed the "Act East Policy" in 2014.

75.(a) Abhinav Bindra won India's first individual Olympic gold medal, in shooting at the 2008 Beijing Olympics.

Section C:

76.(a) 96÷8=12; 7×6=42; 12+42−15=39.

77.(a) Interest = 32,500−25,000 = ₹7,500 over 3 years; rate = (7,500×100)/(25,000×3) = 10%.

78.(a) The parts total 5+8=13; larger number = 130×8/13 = 80.

79.(a) Profit = 540−450 = ₹90; profit percentage = (90/450)×100 = 20%.

80.(a) The first twenty natural numbers sum to 210; average = 210/20 = 10.5.

81.(a) Speed = 180 m / 18 s = 10 m/s = 10×18/5 = 36 km/h.

82.(a) If CP of 30 articles equals SP of 24 articles, SP/CP per article = 30/24 = 1.25, a profit of 25%.

83.(a) 30% of 250 = 75; 15% of 200 = 30; sum = 105.

84.(a) Combined rate = 1/18; A's rate = 1/30; B's rate = 1/18−1/30 = 5/90−3/90 = 2/90 = 1/45, so B alone takes 45 days.

85.(a) Amount = 15,000×(1.10)² = 18,150; compound interest = ₹3,150.

86.(a) 9(x−5)=5x+7 gives 9x−45=5x+7, so 4x=52, x=13.

87.(a) Area of a rectangle = length×breadth = 20×12 = 240 sq cm.

88.(a) Downstream speed = 35+7 = 42 km/h; time = 168/42 = 4 hours.

89.(a) Each term doubles: 8×2=16, 16×2=32, 32×2=64, 64×2=128.

90.(a) A's share is 1.5 times B's (50% more), so 2.5 parts = 90,000, giving B's share = ₹36,000.

Section D:

91.(a) A hard disk is a secondary storage device used for long-term data storage.

92.(a) LAN stands for Local Area Network.

93.(a) MS Excel is used to create spreadsheets.

94.(a) CD-ROM stands for Compact Disc Read-Only Memory.

95.(a) Alt+Tab is used to switch between open windows on Windows.

96.(a) Google is an example of a search engine.

97.(a) GUI stands for Graphical User Interface.

98.(a) The file encryption/password protection feature built into most software is used to protect a document with a password.

99.(a) Wi-Fi enables a device to connect to a network without physical cables.

100.(a) ".jpg" is a valid computer file extension for an image.