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- Question
Which is an invention that improved safety for railway passengers?
Options- A. Air brakes
- B. Refrigerated rail cars
- C. Time standardization
- D. Pullman sleeping cars
- Correct Answer
- Air brakes
ExplanationAn invention that improved safety for railway passengers is Air brakes. With the use of air brakes using compressed air, become more effective by preventing many train accidents.
- 1. Which famous scientist unknowingly founded the field of spectroscopy?
Options- A. Issac Newton
- B. Galileo
- C. Graham Bell
- D. None of the above Discuss
- 2. The cotton gin was an important invention because Discuss
- 3. 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 Discuss
- 4. Who Invented Modern Frequency Modulation FM Radio ?
Options- A. Peter Durand
- B. Percy Shaw
- C. Edwin H. Armstrong
- D. Leo Hendrik Baekeland Discuss
- 5. Who Invented Traffic Signal ?
Options- A. Lewis Edson Waterman
- B. Levi Strauss
- C. Percy LeBaron Spencer
- D. Garrett Augustus Morgan Discuss
- 6. In which country the hormone gibberellin was discovered?
Options- A. India
- B. Japan
- C. China
- D. Russia Discuss
- 7. What did Sir William Herschel discover in 1800?
Options- A. Ultraviolet rays
- B. Infra-red radiation
- C. X rays
- D. Microwaves Discuss
- 8. The credit of inventing the television goes to
Options- A. Philo Farnsworth
- B. John Logie Baird
- C. Charles Francis Jenkins
- D. None of the above Discuss
- 9. Who invented Radio?
Options- A. Grahambell
- B. Galileo
- C. Marconi
- D. Edison Discuss
- 10. Who invented FM radio?
Options- A. Edwin Howard Armstrong
- B. Thomas Alva Edison
- C. Graham Bell
- D. Galileo Discuss
Inventions problems
Search Results
Correct Answer: Issac Newton
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
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.
Correct Answer: Edwin H. Armstrong
Correct Answer: Garrett Augustus Morgan
Correct Answer: Japan
Explanation:
The hormone gibberellin was discovered in the country Japan.
Correct Answer: Infra-red radiation
Explanation:
Sir William Herschel discovered Infra-red radiation in 1800.
Correct Answer: Philo Farnsworth
Correct Answer: Marconi
Explanation:
Guglielmo Marconi, an Italian invetor invented Radio in 1890's.
Correct Answer: Edwin Howard Armstrong
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