1. Who invented biforcal glasses?
Ans : Benjamin Franklin
2. From where do we get the name alcohol?
Ans : From Arabic work 'al Kohl'
3. Where was the first atom bomb test was carried out?
Ans : Bikini Atol Island, Los Alamos, New Mexico
4. What are the weights used by jewellers known as?
Ans : Troy weights
5. What are the four temperature scales?
Ans : Centigrade, Fahrenheit, Absolute and Reaumur
6. Which country has given the world the Arabic number system?
Ans : India
7. Where did the science of accupuncture originate from?
Ans : China
8. What was the first designed airship?
Ans : The Zeppelin
9. Who invented the first effective smallpox vaccine?
Ans : Edward Jenner
10. Which disease is known as "white death"?
Ans : Tuberculosis
11. Who invented the vaccine to prevent hydrophobia?
Ans : Louis Pasteur
12. Name the Phenomenon in which diffusion in solids takes place?
Ans : The formation of fossils
13. What do we know Rontgen rays as?
Ans : X-rays
14. Which laws of physics states that for every action there is an equal and opposite reaction?
Ans : Newton's third Law of Motion
15. What was the chemical name of the explosive dynamite, invented by Alfred E.Nobel?
Ans : Nitroglycerine mixed with charcoal