51. Who invented rechargeable storage battery?
(a) Plante
(b) Spencer
(c) Colt
(d) Pascal
52. Name the inventor of the submarine.
(a) Vail
(b) Holland
(c) Lake
(d) Pascal
53. Point out the inventor of frequency.
(a) Bell
(b) Marconi
(c) Colt
(d) Newton
54. Who invented the telephone?
(a) Graham Bell
(b) Pascal
(c) Spenser
(d) Colt
55. Galileo’s invention is
(a) Telescope
(b) Military tank
(c) Telephone
(d) Razor
56. Name the inventor of the military tank.
(a) Daimler
(b) Swanston
(c) Tesla
(d) Biro
57. Who invented the steam-turbine?
(a) Colaude
(b) Yale
(c) Parsons
(d) Hedley