46. Who invented the steam engine?
a) James Watt
b) Thomas Newcomen
c) George Stephenson
d) Robert Fulton
Answer: a) James Watt
47. Who discovered the law of electromagnetism?
a) James Clerk Maxwell
b) Michael Faraday
c) Albert Einstein
d) Niels Bohr
Answer: a) James Clerk Maxwell
48. Who invented the first successful heart transplant?
a) Christiaan Barnard
b) Joseph Murray
c) Norman Shumway
d) Denton Cooley
Answer: a) Christiaan Barnard
49. Who discovered the law of gravitation?
a) Isaac Newton
b) Galileo Galilei
c) Albert Einstein
d) Stephen Hawking
Answer: a) Isaac Newton
50. Who invented the telephone?
a) Alexander Graham Bell
b) Elisha Gray
c) Antonio Meucci
d) Thomas Edison
Answer: a) Alexander Graham Bell
