1. Stone used in whitewash: Limestone
2. Gas is used for ripening of fruits: Ethylene
3. Planet closest to the earth: Venus
4. Sulphuric acid made by: Jabir bin Hayyan
5. Lock jaws is another name of: Tetanus
6. Branch of physics related to nuclei: Nuclear Physics
7. Sonar is used to calculate: Ocean depth
8. Radar receives waves called: Radio waves
9. Plaster of Paris is obtained from: Gypsum
10. Phosphorus helps plant growth of: Root
11. The blue color of sky is due to: Rayleigh scattering
12. Lens used to correct shortsightedness: Concave
13. Blood clotting happens in: Veins
14. Newspaper can be recycled: 5 times
15. Catalyst to convert oil into ghee: Nickel
16. Conversion of oil into ghee: Hydrogenation