61. Who discovered the electron?
a) J.J. Thomson
b) Robert Millikan
c) Albert Einstein
d) Max Planck
Answer: a) J.J. Thomson
62. Who invented the printing press?
a) Johannes Gutenberg
b) William Caxton
c) Albrecht Dürer
d) Leonardo da Vinci
Answer: a) Johannes Gutenberg
63. Who discovered penicillin?
a) Alexander Fleming
b) Louis Pasteur
c) Robert Koch
d) Paul Ehrlich
Answer: a) Alexander Fleming
64. Who invented the telescope?
a) Hans Lippershey
b) Galileo Galilei
c) Johannes Kepler
d) Isaac Newton
Answer: a) Hans Lippershey
65. Who discovered the laws of heredity?
a) Gregor Mendel
b) Thomas Hunt Morgan
c) Francis Crick
d) James Watson
Answer: a) Gregor Mendel