(A) Edward Jenner
(B) Louis Pasteur
(C) Alexander Fleming
(D) Selman Waksman
Answer: (C) Alexander Fleming
Tag: css gk notes
19. Who discovered the composition of stars?
(A) Cecilia Payne-Gaposchkin
(B) Annie Jump Cannon
(C) Henrietta Leavitt
(D) All of these
Answer: (A) Cecilia Payne-Gaposchkin
20. Who discovered the process of photosynthesis?
(A) Jean Senebier
(B) Jan van Helmont
(C) Joseph Priestley
(D) Jan Ingenhousz
Answer: (D) Jan Ingenhousz
Who performed the first successful heart transplant?
(A) David Hume
(B) Joseph Murray
(C) Michael DeBakey
(D) Christiaan Barnard
Answer: (D) Christiaan Barnard
Who invented the laser?
(A) Thomas Edison
(B) Guglielmo Marconi
(C) Nikola Tesla
(D) Theodore Maiman
Answer: (D) Theodore Maiman
Who invented the first computer?
(A) Charles Babbage
(B) Stephen Hawking
(C) Alan Turing
(D) Thomas Jefferson
Answer: (A) Charles Babbage
Who invented the microwave oven?
(A) Mark Stephanie
(B) Percy Spencer
(C) William Powell
(D) All of these
Answer: (B) Percy Spencer
Who discovered the law of evolution?
(A) Alfred Russel
(B) Gregor Mendel
(C) Charles Darwin
(D) Peter Jackson
Answer: (C) Charles Darwin
Who discovered the structure of DNA?
(A) James Watson
(B) Francis Crick
(C) Charles Darwin
(D) Both A and B
Answer: (D) Both A and B
Who discovered penicillin?
(A) Alexander Fleming
(B) Louis Pasteur
(C) Edward Jenner
(D) Jonas Salk
Answer: (A) Alexander Fleming