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  1. Which among the following is used to dilute oxygen in the gas cylinders used by divers ?

  2. A.

     Krypton

    B.

     Argon

    C.

     Helium

    D.

     Neon

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  3. Which one element from below list is liquid at room temperature?

  4. A.

     Zinc

    B.

     Argon

    C.

     Lead

    D.

     Bromine

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  5. Which among the following elements is found in maximum percentage in the human body ?

  6. A.

     Carbon

    B.

     Hydrogen

    C.

     Nitrozen

    D.

     Oxygen

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  7. Iodine can be separated from a mixture of Iodine and Potassium Chloride by

  8. A.

     Sedimentation

    B.

     Filtration

    C.

     Sublimation

    D.

     Distillation

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

  10. A.

     Neon

    B.

     Argon

    C.

     Krypton

    D.

     Helium

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  11. Which one among the following is not a mixture?

  12. A.

     Graphite

    B.

     Glass

    C.

     Brass

    D.

     Steel

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  13. The gas used to dilute oxygen for breathing by deep sea divers is:

  14. A.

     Neon

    B.

     Argon

    C.

     Nitrogen

    D.

     Helium

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  15. The most abundant element in the human body is

  16. A.

     Carbon

    B.

     Iron

    C.

     Nitrogen

    D.

     Oxygen

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  17. The most abundant element in the earth’s atmosphere is

  18. A.

     Argon

    B.

     Nitrogen

    C.

     Oxygen

    D.

     Krypton

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  19. Select the one which is not a mixture :

  20. A.

     Air

    B.

     Gasoline

    C.

     LPG

    D.

     Distilled water

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