The major ingredient of leather is

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1. The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
2. Epoxy resins is used as
3. The formula of Plaster of Paris is
4. The removal of top soil by water or wind is called
5. The intencity of Earthquakes is measured on
6. Earth's seasons are caused by which of the following?
7. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
8. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
9. The marine animal called dugong which is vulnerable to extinction is a/an
10. Liquefied Petroleum gas (LPG) consists of mainly
11. Lightening cause rainfall because
12. The fastest-running terrestrial animal is
13. The type of glass used in making prisms and lenses is
14. Which of the following is the lightest metal ?
15. The metal that is present in Photo Films is
16. When a gas is turned into a liquid, the process is called
17. Rust is
18. Old-written material, which cannot be read easily can be read by
19. The fastest acting enzyme in the biological kingdom is
20. The hardest substance available on earth is
21. Polythene is industrially prepared by the polymerisation of
22. The Panda belongs to the same family as that of
23. Which of the following parts of the sun is easily visible only during a total solar eclipse?
24. Quartz crystals normally used in quartz clocks etc. is chemically
25. The most important ore of Aluminium is
26. Bromine is
27. Glass is made from the mixture of
28. What is the unit for measuring the pitch or frequency of sound ?
29. One fathom is equal to
30. Which of the following is in liquid form at room temperature ?

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