66. Who invented the first airplane?
a) Orville and Wilbur Wright
b) Gustave Whitehead
c) Samuel Pierpont Langley
d) Alberto Santos-Dumont
Answer: a) Orville and Wilbur Wright
67. Who discovered the X-ray?
a) Wilhelm Conrad Roentgen
b) Max Planck
c) Marie Curie
d) Ernest Rutherford
Answer: a) Wilhelm Conrad Roentgen
68. Who invented the light bulb?
a) Thomas Edison
b) Joseph Swan
c) Humphry Davy
d) Nikola Tesla
Answer: a) Thomas Edison
69. Who discovered the process of pasteurization?
a) Louis Pasteur
b) Robert Koch
c) Paul Ehrlich
d) Gerhard Domagk
Answer: a) Louis Pasteur
70. Who invented the telephone exchange?
a) Tivadar Puskás
b) Elisha Gray
c) Alexander Graham Bell
d) Thomas Edison
Answer: a) Tivadar Puskás