26. Who invented the first successful helicopter?
a) Igor Sikorsky
b) Leonardo da Vinci
c) Wilbur Wright
d) Orville Wright
Answer: a) Igor Sikorsky
27.Who discovered the law of conservation of energy?
a) Albert Einstein
b) Isaac Newton
c) James Clerk Maxwell
d) Robert Boyle
Answer: c) James Clerk Maxwell
28. Who invented the first microscope?
a) Antonie van Leeuwenhoek
b) Robert Hooke
c) Galileo Galilei
d) Johannes Kepler
Answer: a) Antonie van Leeuwenhoek
29. Who discovered the law of thermodynamics?
a) Sadi Carnot
b) James Joule
c) Lord Kelvin
d) Rudolf Clausius
Answer: a) Sadi Carnot
30. Who invented the first digital computer?
a) Charles Babbage
b) Alan Turing
c) John von Neumann
d) Ada Lovelace
Answer: b) Alan Turing
