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  1. Safety matches is produced using

  2. A.
    red phosphorus
    B.
    yellow phosphorus
    C.
    black phosphorus
    D.
    elemental sulphur

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  3. Calorific value of __________ are almost same.

  4. A.
    lignite & anthracite coal
    B.
    lignite & coal gas
    C.
    petrol & diesel
    D.
    coal gas & natural gas

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  5. Which of the following pairs is not correctly matched ?

  6. A.
    Uranium - 233 : Fertile material.
    B.
    Bindingenergy : Mass defect.
    C.
    Scattering: Absorption cross-section.
    D.
    Number of nucleons : Mass number.

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  7. Commonly used flux for brazing is

  8. A.
    zinc chloride
    B.
    borax
    C.
    ammonium chloride
    D.
    rosin

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  9. Iron has got __________ isotopes.

  10. A.
    no
    B.
    four
    C.
    three
    D.
    two

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  11. Semi-conductors normally employ __________ bonding.

  12. A.
    co-ordinate
    B.
    ionic
    C.
    covalant
    D.
    metallic

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  13. High endurance limit of carburised machine parts is because of the fact that carburisation

  14. A.
    suppresses any stress concentration produced in the parts.
    B.
    enhances the yield point of the material.
    C.
    introduces a compressive layer on the surface.
    D.
    produces a better surface finish.

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  15. In __________ process, there is an increase in entropy with no degradation of energy.

  16. A.
    isothermal expansion
    B.
    isochoric heat addition
    C.
    polytropic expansion
    D.
    isobaric heat addition

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  17. Which of the following is categorised as the plastic welding ?

  18. A.
    Gas welding
    B.
    Electric arc welding
    C.
    Forge welding
    D.
    None of these

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  19. In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.

  20. A.
    film
    B.
    nucleate
    C.
    transition
    D.
    all modes of

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