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  1. Bromine is a

  2. A.
    black solid
    B.
    red liquid
    C.
    colourless gas
    D.
    highly inflammable gas

  3. The hardest substance available on earth is

  4. A.
    Gold
    B.
    Iron
    C.
    Diamond
    D.
    Platinum

  5. The variety of coal in which the deposit contains recognisable traces of the original plant material is

  6. A.
    bitumen
    B.
    anthracite
    C.
    lignite
    D.
    peat

  7. Tetraethyl lead is used as

  8. A.
    pain killer
    B.
    fire extinguisher
    C.
    mosquito repellent
    D.
    petrol additive

  9. Which of the following is used as a lubricant?

  10. A.
    Graphite
    B.
    Silica
    C.
    Iron Oxide
    D.
    Diamond

  11. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

  12. A.
    Argon
    B.
    Xenon
    C.
    Helium
    D.
    Krypton

  13. The gases used in different types of welding would include

  14. A.
    oxygen and hydrogen
    B.
    oxygen, hydrogen, acetylene and nitrogen
    C.
    oxygen, acetylene and argon
    D.
    oxygen and acetylene

  15. The property of a substance to absorb moisture from the air on exposure is called

  16. A.
    osmosis
    B.
    deliquescence
    C.
    efflorescence
    D.
    desiccation

  17. In which of the following activities silicon carbide is used?

  18. A.
    Making cement and glass
    B.
    Disinfecting water of ponds
    C.
    cutting very hard substances
    D.
    Making casts for statues

  19. The average salinity of sea water is

  20. A.
    3%
    B.
    3.5%
    C.
    2.5%
    D.
    2%