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  1. Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is __________ Nm3 .

  2. A.
    0.5
    B.
    1
    C.
    2
    D.
    2.5

  3. Out of the following, the joint produced by __________ has the lowest strength.

  4. A.
    soldering
    B.
    welding
    C.
    brazing
    D.
    rivetting

  5. Dies for wire drawing are generally made of

  6. A.
    mild steel
    B.
    stainless steel
    C.
    carbides
    D.
    high carbon steel

  7. The starting of a car takes time in winter, because the

  8. A.
    octane number of fuel is decreased.
    B.
    fuel supply for ignition is not sufficient.
    C.
    vaporisation of the fuel is decreased.
    D.
    pour point of fuel decreases.

  9. The elastic strain in copper is due to the

  10. A.
    motion of dislocations.
    B.
    stretching of atomic bonds.
    C.
    breakage of atomic bonds.
    D.
    none of the above.

  11. Milk is fat dispersed in water. It is an example of

  12. A.
    suspension
    B.
    emulsion
    C.
    gel
    D.
    solution

  13. __________ is the most suitable lubricant for drawing mild steel wires?

  14. A.
    Kerosene
    B.
    Water
    C.
    Sodium stearate
    D.
    Lime water

  15. Reduction in the grain size reduces the __________ of the material.

  16. A.
    fatigue resistance
    B.
    tensile strength
    C.
    creep resistance
    D.
    all (a), (b) & (c)

  17. Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at

  18. A.
    high vacuum
    B.
    zero pressure
    C.
    0°K
    D.
    earth's centre

  19. In case of simple harmonic motion, displacement is proportional to the

  20. A.
    velocity
    B.
    acceleration
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)