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  1. Sewage is not an excellent medium for the growth of

  2. A.
    aquatic creatures.
    B.
    protozoa.
    C.
    virus.
    D.
    pathogenic bacteria.

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  3. Which of the following pair is correctly matched?

  4. A.
    Heat transfer: Thermal diffusivity.
    B.
    Mass transfer: Diffusion co-efficient.
    C.
    Momentum transfer: Kinematic viscosity.
    D.
    all 'a', 'b' & 'c' are correctly matched.

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  5. Rate of chemical reaction is not much affected, if the reactants are in __________ form.

  6. A.
    solids
    B.
    liquids
    C.
    either (a) or (b)
    D.
    gaseous

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  7. Materials used for making permanent magnets containing iron and nickel are made by __________ technique.

  8. A.
    powder metallurgy
    B.
    casting
    C.
    forging
    D.
    none of these

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  9. Lubrication is done to control

  10. A.
    friction
    B.
    wear
    C.
    temperature
    D.
    all (a), (b) & (c)

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  11. Lead is most readily dissolved in

  12. A.
    acetic acid
    B.
    hydrochloric acid
    C.
    nitric acid
    D.
    sulphuric acid

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  13. Which of the following is a synthetic abrasive ?

  14. A.
    Corundum
    B.
    Emery
    C.
    Pumice
    D.
    Silicon carbide

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  15. Dezincification is a form of corrosion, which specifically applies to

  16. A.
    steel
    B.
    brass
    C.
    stainless steel
    D.
    babbit metal

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  17. Water hammer in pipelines results, when the flowing fluid

  18. A.
    has very high velocity.
    B.
    has very high pressure.
    C.
    is brought to rest by gradually closing a valve.
    D.
    is suddenly brought to rest by closing a valve.

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  19. The preferred alloying element for low temperature applications of steel is

  20. A.
    Cr
    B.
    N
    C.
    Mo
    D.
    Ni

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