Important general Science questions- GK series #6

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Important general Science questions- GK series #6

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

2. Which of the following is a non metal that remains liquid at room temperature?
A. Phosphorous B. Bromine
C. Chlorine D. Helium

3. Chlorophyll is a naturally occurring chelate compound in which central metal is
A. copper B. magnesium
C. iron D. calcium

4. Which of the following is used in pencils?
A. Graphite B. Silicon
C. Charcoal D. Phosphorous


5. Which of the following metals forms an amalgam with other metals?
A. Tin B. Mercury
C. Lead D. Zinc


6. Chemical formula for water is
A. NaA1O2 B. H2O
C. Al2O3 D. CaSiO3

7. The gas usually filled in the electric bulb is
A. nitrogen
B. hydrogen
C. carbon dioxide
D. oxygen

8. Washing soda is the common name for
A. Sodium carbonate
B. Calcium bicarbonate
C. Sodium bicarbonate
D. Calcium carbonate

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

10. Which of the gas is not known as green house gas?
A. Methane
B. Nitrous oxide
C. Carbon dioxide
D. Hydrogen


11. Bromine is a
A. black solid
B. red liquid
C. colourless gas
D. highly inflammable gas

12. The hardest substance available on earth is
A. Gold B. Iron
C. Diamond D. Platinum


13. The variety of coal in which the deposit contains recognisable traces of the original plant material is
A. bitumen B. anthracite
C. lignite D. peat

14. Tetraethyl lead is used as
A. pain killer
B. fire extinguisher
C. mosquito repellent
D. petrol additive

15. Which of the following is used as a lubricant?
A. Graphite
B. Silica
C. Iron Oxide
D. Diamond

16. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
A. Argon B. Xenon
C. Helium D. Krypton

17. The gases used in different types of welding would include
A. oxygen and hydrogen
B. oxygen, hydrogen, acetylene and nitrogen
C. oxygen, acetylene and argon
D. oxygen and acetylene

18. The property of a substance to absorb moisture from the air on exposure is called
A. osmosis B. deliquescence
C. efflorescence D. desiccation

19. In which of the following activities silicon carbide is used?
A. Making cement and glass
B. Disinfecting water of ponds
C. cutting very hard substances
D. Making casts for statues

20. The average salinity of sea water is
A. 3% B. 3.5%
C. 2.5% D. 2%

21. When an iron nail gets rusted, iron oxide is formed
A. without any change in the weight of the nail
B. with decrease in the weight of the nail
C. with increase in the weight of the nail
D. without any change in colour or weight of the nail

22. Galvanised iron sheets have a coating of
A. lead B. chromium
C. zinc D. tin

23. Among the various allotropes of carbon,
A. coke is the hardest, graphite is the softest
B. diamond is the hardest, coke is the softest
C. diamond is the hardest, graphite is the softest
D. diamond is the hardest, lamp black is the softest

24. The group of metals Fe, Co, Ni may best called as
A. transition metals
B. main group metals
C. alkali metals
D. rare metals

25. Heavy water is
A. deuterium oxide
B. PH7
C. rain water
D. tritium oxide

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