21. Gun was invented by:
(a) Bushnell
(b) Browning
(c) Plante
(d) Parson

 

22. Which of the following is the invention of Jarvik?
(a) Photography
(b) Photophone
(c) Artificial heart
(d) Colours photos

 

23. Name the inventor of Hydrometer?
(a) Baume
(b) Edison
(c) Edison
(d) Ester

 

24. Whose invention is incandescent lamp?
(a) Colt
(b) Waterman
(c) Bullock
(d) Hunt

 

25. Point out the inventor of Minor’s safety lamp.
(a) Goldmark
(b) Davy
(c) Spencer
(d) Richter

 

26. What is invented by Yale?
(a) Parachute
(b) Tan
(c) Lamp
(d) Cylinder lock

 

27. Mention the inventor of electric locomotive.
(a) Bell
(b) Vail
(c) Hoe
(d) Watt

 

28. Who is the inventor of the practical locomotive?
(a) Stephenson
(b) Harvey
(c) Plante
(d) Barly

 

29. Whose invention is power loom?
(a) Woods
(b) Cartwright
(c) Edison
(d) Marconi

 

30. Name the inventor of Dynamic loudspeaker.
(a) Talbot
(b) Colt
(c) Kellogg Pice
(d) Harrison