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  1. The Al2 O3 content of cryolite in Hall-Heroult's cell is maintained between __________ percent.

  2. A.
    2-5
    B.
    18-20
    C.
    12-15
    D.
    6-12

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  3. Number of electrons in the outermost shell of a semi-conductor material is

  4. A.
    2
    B.
    4
    C.
    6
    D.
    8

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  5. The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it, is defined as the

  6. A.
    minimum fluidisation velocity.
    B.
    terminal velocity.
    C.
    elutriation velocity.
    D.
    superficial velocity.

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  7. Tip of the match stick contains a mixture of

  8. A.
    K + S
    B.
    K + S + K2Cr2O7
    C.
    S + K2Cr2O7 + White P
    D.
    none of these

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  9. Which of the following is not an ore of aluminium ?

  10. A.
    Troosite
    B.
    Kaolin
    C.
    Alunite
    D.
    Cryolite

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  11. Mechanism/phenomenon involved in the improvement of fatigue strength of a material by shot peening is the

  12. A.
    induction of residual compressive stress on the surface.
    B.
    removal of stress concentration from the surface.
    C.
    grain refinement.
    D.
    surface polishing.

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  13. Springs are not made of

  14. A.
    phospher bronze.
    B.
    nickel steel.
    C.
    monel.
    D.
    carbon steel (c ≤ 0.5%).

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  15. Pick out the wrong statement.

  16. A.
    In Parke's process, zinc is added to remove silver from lead.
    B.
    In the Pidgeon process of producing magnesium, powdered ferro-silcon is used as the reducing agent.
    C.
    Molten lead is used for shock cooling of the zinc vapours in the zinc blast furnace.
    D.
    Pure copper electrodes are used as anode for electro-refinning of copper.

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  17. Monazite deposits constitute an important source for the following metal.

  18. A.
    Thorium
    B.
    Titanium
    C.
    Molybdenum
    D.
    None of the above

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  19. α-rays are

  20. A.
    negatively charged.
    B.
    positively charged.
    C.
    neutral.
    D.
    same as X-rays.

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