21. Who discovered the law of motion?
a) Galileo Galilei
b) Isaac Newton
c) Albert Einstein
d) Stephen Hawking
Answer: b) Isaac Newton
22. Who invented the first practical telephone?
a) Alexander Graham Bell
b) Thomas Edison
c) Elisha Gray
d) Antonio Meucci
Answer: a) Alexander Graham Bell
23. Who discovered the principles of genetics?
a) Gregor Mendel
b) Charles Darwin
c) Thomas Hunt Morgan
d) James Watson
Answer: a) Gregor Mendel
24. Who invented the World Wide Web?
a) Bill Gates
b) Tim Berners-Lee
c) Steve Jobs
d) Alan Turing
Answer: b) Tim Berners-Lee
25. Who discovered the laws of motion for fluids?
a) Isaac Newton
b) Daniel Bernoulli
c) Galileo Galilei
d) Blaise Pascal
Answer: b) Daniel Bernoulli
