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