41. The Solar System was discoverd by
A. Galleleo
B. Finsen
C. Copernicus
D. None of these
42. Landstrom invented
A. Metallurgy
B. Gas Engine
C. Safety Match
D. none of these
43. Bicycle was invented by
A. Alexanderson
B. Macmillan
C. Eijkman
D. none of these
44. Cholera Bascillus was invented by
A. Hoffman
B. Dunlop
C. Joseph Lister
D. Robert Koch
45. D.D.T. was invented by
A. Paul Muller
B. John Dalton
C. Rudolf
D. None of these
46. The theory of Evolution was produced by
A. Darwin
B. Einstein
C. Newton
D. Mendel
47. Neutron was discovered by
A. Marie Curie
B. Mendeleef
C. Rutherford
D. Chadwick
48. Cinematography was invented by
A. Graham Bell
B. Edison
C. Zeiss
D. Faraday
49. Inert gases were discovered by
A. Dalton
B. Newton
C. Roentgen
D. Ramsay
50. Who discovered oxygen?
A. Lavoisier
B. Joseph Priestley
C. Dalton
D. Swinton
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