41. Who invented colour photo?
(a) Goldmark
(b) Ives
(c) Howe
(d) Fulton
42. Who invented the photographic paper?
(a) Bell
(b) Spenser
(c) Talbot
(d) Spenser
43. Colt’s invention is:
(a) Monotype
(b) Pistol
(c) Pendulum
(d) Razor
44. Hunt’s invention is:
(a) Pendulum
(b) Safety-pin
(c) Razor
(d) Pistol
45. What is invented by Watson-Watt?
(a) Radar
(b) Jenkins
(c) Colt
(d) Galileo
46. Inventor of disc record is:
(a) Jarvik
(b) Tait
(c) Berliner
(d) Edison
47. Inventor of long-playing record is:
(a) Berliner
(b) Goldmark
(c) Colt
(d) Spenser
48. Point out the invention of Richter.
(a) Richter scale
(b) Lamp
(c) Bicycle
(d) Razor
49. Name the inventor of the sewing machine?
(a) Tait
(b) Howe
(c) Goldmark
(d) Digital Crop
50. Who invented stainless steel?
(a) Walker
(b) Edison
(c) Brearley
(d) None of these