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1. The raw materials needed to make plastics is obtained from ?
Answer :-Petroleum
2. The first purely synthetic fibre was?
Answer :- Nylone
3. Which tree has the scientific name hevea brasiliensis?
Answer :- Rubber tree
4. The main solvent of rubber is?
Answer :- Turpentine
5. The element used for the vulcanization of rubber is?
Answer :- Sulphur
6. The nearest star to solar system is?
Answer :- Proxima Centauri
7. The smallest Planet is?
Answer :- Mercury
8. Which is the brightest Planet?
Answer :- Venus
9. Triton is the largest moon of?
Answer :- Neptune
10. The largest asteroid in the Solar System is?
Answer :- Ceres
11. The hardest natural substance is?
Answer :- Diamond
12. The main cause of the acid rain is the chemical?
Answer :- Sulphur dioxide
13. The global warming and the green house effect were first described by the scientist?
Answer :- Svante Arrhenius
14. The pH value of the gastric juices is around?
Answer :- 1 - 3
15. The heaviest element is?
Answer :- Osmium
16. Potassium and Sodium were discovered by?
Answer :- Sir Humphry Davy
17. The lighest metal is?
Answer :- Lithium
18. The most abundant chemical element in the Universe is?
Answer :- Hydrogen
19. Who gave the name 'Hydrogen'?
Answer :- Antoine Lavoisier
20. What is the atomic number of Oxygen?
Answer :- 8
Answer :-Petroleum
2. The first purely synthetic fibre was?
Answer :- Nylone
3. Which tree has the scientific name hevea brasiliensis?
Answer :- Rubber tree
Answer :- Turpentine
5. The element used for the vulcanization of rubber is?
Answer :- Sulphur
6. The nearest star to solar system is?
Answer :- Proxima Centauri
7. The smallest Planet is?
Answer :- Mercury
8. Which is the brightest Planet?
Answer :- Venus
Answer :- Neptune
10. The largest asteroid in the Solar System is?
Answer :- Ceres
11. The hardest natural substance is?
Answer :- Diamond
12. The main cause of the acid rain is the chemical?
Answer :- Sulphur dioxide
13. The global warming and the green house effect were first described by the scientist?
Answer :- Svante Arrhenius
14. The pH value of the gastric juices is around?
Answer :- 1 - 3
Answer :- Osmium
16. Potassium and Sodium were discovered by?
Answer :- Sir Humphry Davy
17. The lighest metal is?
Answer :- Lithium
18. The most abundant chemical element in the Universe is?
Answer :- Hydrogen
19. Who gave the name 'Hydrogen'?
Answer :- Antoine Lavoisier
20. What is the atomic number of Oxygen?
Answer :- 8
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