31. In which of the following activities silicon carbide is useD. A. Making cement and glass B. Disinfecting water of ponD. C. cutting very hard substances D. Making casts for statues Answer: C. cutting very hard substances 32. The average salinity of sea water is A. 3% B. 3.5% C. 2.5% D. 2% Answer: B.
more..21. The element common to all acids is A. hydrogen B. carbon C. sulphur D. oxygen Answer: A. hydrogen 22. Non stick cooking utensils are coated with A. Teflon B. PVC C. black paint D. polystyrene Answer: A. Teflon 23. Galvanised iron sheets have a coating of A. lead B. chromium C. zinc D. tin
more..11. Which of the following is an element? A. Ruby B. Sapphire C. Emerald D. Diamond Answer: D. Diamond 12. Horizontal rows in the periodic table are called ___________ a. Groups b. Group 14 c. PerioD. d. Period 14 ANSWER: c. PerioD. 13. Water is a good solvent of ionic salts because A. it has
more..This is the Part 1 general knowledge questions and answers section on “Metals and Elements” with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand. 1. Supplements containing which of the following metals are generally prescribed for persons suffering
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