1. Calculator
Ans. B.Pascal
2. Camera
Ans. Willian F Grein
3. Watch (Mechanical)
Ans. Seng Ling Saun
4. Fountain Pen
Ans. Waterman
5. Lift
Ans. F.G. Ottice
6. Machinegun
Ans. James Puckle
7. Microphone
Ans. Graham Bell
8. Powerloom
Ans. Cartwright
9. Radar
Ans. R.A. Watson Watt
10. Saftey Razor
Ans. Gillete
11. Rivolver
Ans. Colt
12. Safety Pin
Ans. Walter Hunt
13. Sewing Machine
Ans. Elias Howe
14. Cycle
Ans. MacMilan
15. Cycle Tyres
Ans. Dunlop
16. Steam Engine
Ans. James Watt
17. Television
Ans. J.L. Baird
18. Motor-Car (Petrol)
Ans. Carl Benz
19. Printing Press
Ans. Caxton
20. Wrist Watch
Ans. Braigwet
21. Dynamo
Ans. Michael Faraday
22. Automobile
Ans. G. Diemler
23. Radio
Ans. G. Marconi
24. Refrigerator
Ans. Harrison and Catlien
25. Stainless steel
Ans. Brierlay
26. Gunpowder
Ans. Roger Becken
27. Internal Combustion Engine
Ans. Rudolf Diesel
28. Steam-boat
Ans. Phulton
29. Telescope
Ans. Galileo
30. Microscope
Ans. Johnsen
31. Scooter
Ans. J.Brousha
32. Transistor
Ans. W. Shockley
33. Camera and Lens
Ans. Jins
34. Aeroplane
Ans. Wright Brothers
35. Railway Engine
Ans. Stephenson
36. Safety Matches
Ans. Landstrom
37. Barometer
Ans. Torricelli
38. Gas Engine
Ans. Deimler
39. Solar Energy
Ans. Copernicus
40. Halicopter
Ans. Bracket
41. Saftey Lamp
Ans. Humphry Davy
42. Typewriter
Ans. Solo
43. Rubber Tyres
Ans. Thomas Cock
44. Telephone
Ans. Graham Bell
45. Electron
Ans. J.J. Thompson
46. Atomic Number
Ans. Moseley
47. Atomic Theory
Ans. Dalton
48. Atomic Structure
Ans. Rutherford
49. Atomic Bomb
Ans. Otto Hahn
50. Radioactivity
Ans. Henry Bacqerel
51. Radium
Ans. Madam Curie,Peire and Morey
52. Nuclear fission
Ans. Rutherford
53. Electric Current and Battery
Ans. Volta
54. Dynamite
Ans. Alfred Nobel
55. Hydrogen
Ans. Cavendish
56. Electric bulb
Ans. Edison
57. Law of Electric Resistance
Ans. Ohm
58. Law of Gravitation
Ans. Newton
59. Theory of Relativity
Ans. Albert Einstein
60. Law of Periodicity
Ans. Mendeleef
61. Quantum Theory
Ans. Max Planck
62. Theory of Crystal
Ans. C.V.Raman
63. Theory of Photography
Ans. Grabiel Lipman
64. Lightening Conductor
Ans. Benjamin Franklin
65. Book for the Blind
Ans. Louis Braille
66. Jet Engine
Ans. Franc Whitley
67. Thermometer
Ans. Fahrenheit
68. Marine
Ans. David Buswell
69. Electric Waves
Ans. Hertz
70. T.N.T.
Ans. Will Brand
71. Computer(Electric)
Ans. E. Manchelli
72. Electric Fan
Ans. Whealer
73. Telegraph code
Ans. Samuel Mores
74. Logarithm
Ans. John Napier
75. Micrometer
Ans. Willian Gascoigne
76. X-ray
Ans. Roentgen
77. Laughing Gas
Ans. Preistley
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