106. Who discovered the structure of DNA?
a) James Watson and Francis Crick
b) Rosalind Franklin
c) Maurice Wilkins
d) Linus Pauling
Answer: a) James Watson and Francis Crick
107. Who invented the first practical radar system?
a) Robert Watson-Watt
b) Christian Hülsmeyer
c) Nikola Tesla
d) Guglielmo Marconi
Answer: a) Robert Watson-Watt
108. Who discovered the principles of the gas turbine engine?
a) Frank Whittle
b) Hans von Ohain
c) Charles Parsons
d) Robert Stirling
Answer: a) Frank Whittle
