76. Who invented the first practical camera?
a) Louis Daguerre
b) William Henry Fox Talbot
c) George Eastman
d) Johannes Kepler
Answer: a) Louis Daguerre
77. Who discovered the law of electromagnetic induction?
a) Michael Faraday
b) James Clerk Maxwell
c) Heinrich Hertz
d) Thomas Edison
Answer: a) Michael Faraday
78. Who invented the first successful airplane engine?
a) Charles Rolls
b) Henry Royce
c) Wright Brothers
d) Rudolf Diesel
Answer: c) Wright Brothers
79. Who discovered the circulation of blood?
a) William Harvey
b) Edward Jenner
c) Louis Pasteur
d) Robert Koch
Answer: a) William Harvey
80. Who invented the first practical battery?
a) Alessandro Volta
b) Michael Faraday
c) Benjamin Franklin
d) Galileo Galilei
Answer: a) Alessandro Volta