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- Question
Who Discovered The Nucleus of a Cell?
Options- A. Otto Hahn
- B. John Dalton
- C. Robert Brown
- D. Marie Curie
- Correct Answer
- Robert Brown
ExplanationRobert Brown, Scottish botanist, Discovered The Nucleus of a Cell in 1831, London. When Brown was studying orchids under microscope when he observed an opaque area, which he called the "Areola" or "Nucleus", in the cells of the flower's outer layer.
The nucleus was also described by Franz Bauer in 1804 but in detail Robert Brown made it in 1831.
- 1. The first effective vaccine against polio was prepared by ?
Options- A. Robert Edwards
- B. James Simpson
- C. H Gibbon
- D. Jonas E Salk Discuss
- 2. The first hand glider was designed by??
Options- A. Leonardo DaVinci
- B. The Wright brothers
- C. Francis Rogallo
- D. Galileo Discuss
- 3. Bushwell invented
Options- A. Atomic Bomb
- B. Submarine
- C. Urey
- D. Hovercraft Discuss
- 4. FROZEN FOOD ? Who discovered the first practical method of freezing food?
Options- A. C. Birdseye
- B. F. Rozenosh
- C. G. Findus
- D. R. Scott Discuss
- 5. Who invented waterproof fabrics ?
Options- A. James Dewar
- B. Charles Goodyear
- C. Mary Moore
- D. Charles Macintosh Discuss
- 6. Who invented Electric Generator?
Options- A. Michael Faraday
- B. Thomas Alva Edison
- C. Graham Bell
- D. Alfred Nobel Discuss
- The operating principle of electromagnetic generators was discovered in the years of 1831?1832 by Michael Faraday.
- The principle later called Faraday's law, is that an electromotive force is generated in an electrical conductor which encircles a varying magnetic flux.
- 7. When was Barb Wire patented
Options- A. 1898
- B. 1868
- C. 1874
- D. 1866 Discuss
- Glidden was born in New York in 1812. He invented Barbed Wire in 1873 and was granted the patent on Nov. 24, 1874. After a three year battle over the patent, which he eventually won received a patent for the modern invention in 1874 after he made his own modifications to previous versions.
- 8. Simpson and Harrison are associated with the invention of
Options- A. Boson
- B. Chloroform
- C. Balloon
- D. None of these Discuss
- 9. Who invented fuel cells in 1839?
Options- A. Buckminster Fuller
- B. Sir William Grove
- C. Sylvester Graham
- D. Joyce Hall Discuss
- 10. Who is known as inventor of World Wide Standard Time ?
Options- A. Sandford Fleming
- B. Fredrich
- C. Williamson
- D. James Broot Discuss
Inventions problems
Search Results
Correct Answer: Jonas E Salk
Correct Answer: Leonardo DaVinci
Correct Answer: Submarine
Correct Answer:
Correct Answer: Charles Macintosh
Explanation:
Charles Macintosh (29 December 1766 ? 25 July 1843) was a Scottish chemist and inventor of waterproof fabrics.He devoted all his spare time to science, particularly chemistry, and before he was twenty resigned his clerkship to take up the manufacture of chemicals. In this he was highly successful, inventing various new processes. His experiments with one of the by-products of tar, naphtha, led to his invention of waterproof fabrics.
Correct Answer: Michael Faraday
Explanation:
Michael Faraday invented Electric Generator in 1831.
Correct Answer: 1874
Explanation:
Joseph F. Glidden - Father of Barbed Wire.
Correct Answer: Chloroform
Correct Answer: Sir William Grove
Correct Answer: Sandford Fleming
Explanation:
Sir Sandford Fleming, (January 7, 1827 ? July 22, 1915) was a Scottish Canadian engineer and inventor. Born and raised in Scotland, he emigrated to colonial Canada at the age of 18. He proposed worldwide standard time zones, designed Canada's first postage stamp.
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