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Kerala PSC - Important and Repeated General Science Questions - 04

Kerala PSC - Important and Repeated General Science Questions - 04

1. Which of the following metals forms an amalgam with other metals?

[a] Tin
[b] Mercury
[c] Lead
[d] Zinc


2. Which of the following is used in pencils?

[a] Graphite
[b] Silicon
[c] Charcoal
[d] Phosphorous


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 a non metal that remains liquid at room temperature?

[a] Phosphorous
[b] Bromine
[c] Chlorine
[d] Helium


5. 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


6. Which of the gas is not known as green house gas?

[a] Methane
[b] Nitrous oxide
[c] Carbon dioxide
[d] Hydrogen


7. 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


8. Washing soda is the common name for

[a] Sodium carbonate
[b] Calcium bicarbonate
[c] Sodium bicarbonate
[d] Calcium carbonate


9. The gas usually filled in the electric bulb is

[a] nitrogen
[b] hydrogen
[c] carbon dioxide
[d] oxygen


10. Chemical formula for water is

[a] NaAlO2
[b] H2O
[c] Al2O3
[d] CaSiO3


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


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