The hardest substance available on earth is

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3. Which of the following is in liquid form at room temperature ?
4. Nitrification means
5. The metal that is present in Photo Films is
6. Pollination by birds is called
7. The major ingredient of leather is
8. In an atomic nucleus, neutrons and protons are held together by
9. The marine animal called dugong which is vulnerable to extinction is a/an
10. Brass gets discoloured in air due to the presence of which gas in air
11. Which of the following is commonly called a polyamide ?
12. The fastest acting enzyme in the biological kingdom is
13. The formula of Plaster of Paris is
14. Which of the following characters is not shown by hydrogen
15. Lightening cause rainfall because
16. The recent atomic weight scale is based on
17. The chemial name of Uria is
18. Glass is made from the mixture of
19. The colour of Emerald is
20. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
21. The type of glass used in making prisms and lenses is
22. Quartz crystals normally used in quartz clocks etc. is chemically
23. Liquefied Petroleum gas (LPG) consists of mainly
24. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
25. Permanent hardness of water can be removed by adding
26. The hardest substance available on earth is
27. The metal used in storage batteries
28. What is the unit for measuring the pitch or frequency of sound ?
29. Old-written material, which cannot be read easily can be read by
30. Cell membrane is

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