Inventions problems
- 1. Who invented Vacuum Flask?
Options- A. Charles Babbage
- B. Alexander Fleming
- C. Gregory Pincus
- D. James Dewar Also asked in: Bank Exams
Correct Answer: James Dewar
- 2. Who invented the battery?
Options- A. John Wilkinson
- B. Alessandro Volta
- C. James Hargreaves
- D. Thomas Edison Discuss
Correct Answer: Alessandro Volta
- 3. The Solar System was discoverd by
Options- A. Galleleo
- B. Finsen
- C. Copernicus
- D. None of these Discuss
Correct Answer: Copernicus
- 4. Telegrahic code was introduced by
Options- A. Lipman
- B. Macmillan
- C. Thomas Moore
- D. Cockrell Discuss
Correct Answer: Thomas Moore
- 5. Lift was invented by
Options- A. Otis
- B. Domagk
- C. Lee De Forest
- D. None of these Discuss
Correct Answer: Otis
- 6. Who Invented The World Wide Web ?
Options- A. Sir Timothy John
- B. Earle Dickson
- C. James Rineose
- D. Laszlo Jozsef Biro Discuss
Correct Answer: Sir Timothy John
- 7. Who Invented Traffic Signal ?
Options- A. Lewis Edson Waterman
- B. Levi Strauss
- C. Percy LeBaron Spencer
- D. Garrett Augustus Morgan Discuss
Correct Answer: Garrett Augustus Morgan
- 8. Who Invented Modern Frequency Modulation FM Radio ?
Options- A. Peter Durand
- B. Percy Shaw
- C. Edwin H. Armstrong
- D. Leo Hendrik Baekeland Discuss
Correct Answer: Edwin H. Armstrong
- 9. What two scientists established the structure of dna?
Options- A. Rosalind Franklin and Maurice Wilkins
- B. James Watson and Francis Crick
- C. Rosalind Franklin and Francis Crick
- D. James Watson and Maurice Wilkins Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: James Watson and Francis Crick
Explanation:
In the early 1950s two scientists, Rosalind Franklin and Maurice Wilkins, studied DNA using x-rays. Franklin produced an x-ray photograph that allowed two other researchers, James Watson and Francis Crick to work out the 3D structure of DNA. The structure of DNA was found to be a double helix.
- 10. The cotton gin was an important invention because Also asked in: Analyst, Bank Clerk, Bank PO
Correct Answer: Cotton Gin was invented by Eli Whitney in 1793, which is used to separate cotton seeds from cotton fiber Hence, it was an important invention because it dramatically reduced the amount of time it took to separate cotton seeds from cotton fiber
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