GENERAL SCIENCE (y) (y) (y) (y) (y) (y) (y) (y) 1. Brass gets discoloured in air because of the presence of which of the following gases in air? A. Oxygen B. Hydrogen sulphide C. Carbon dioxide D. Nitrogen Ans - B 2. Which of the following is a non metal that remains liquid at room temperature? A. Phosphorous B. Bromine C. Chlorine D. Helium Ans - B 3. Chlorophyll is a naturally occurring chelate compound in which central metal is A. copper B. magnesium C. iron D. calcium Ans - B 4. Which of the following is used in pencils? A. Graphite B. Silicon C. Charcoal D. Phosphorous Ans - A 5. Which of the following metals forms an amalgam with other metals? A. Tin B. Mercury C. Lead D. Zinc Ans - B 6. Chemical formula for water is A. NaAlO2 B. H2O C. Al2O3 D. CaSiO3 Ans - B 7. The gas usually filled in the electric bulb is A. nitrogen B. hydrogen C.Mcarbon dioxide D. oxygen Ans - A 8. Washing soda is the common name for A. Sodium carbonate B. Calcium bicarbonate C. Sodium bicarbonate D. Calcium carbonate Ans - A 9. Quartz crystals normally used in quartz clocks etc. is chemically A. silicon dioxide B. germanium oxide C. a mixture of germanium oxide and silicon dioxide D. sodium silicate Ans - A 10. Which of the gas is not known as green house gas? A. Methane B. Nitrous oxide C. Carbon dioxide D. Hydrogen Ans - D
Posted on: Thu, 09 Oct 2014 05:33:06 +0000
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