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  • Question
  • The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.


  • Options
  • A. 1100
  • B. 2200
  • C. 3300
  • D. 4400

  • Correct Answer
  • 2200 


  • More questions

    • 1. Pick out the wrong statement.

    • Options
    • A. The vessel dispersion number (D/UL) for plug flow and mixed flow approaches zero and infinity respectively.
    • B. Space time in a flow reactor is a measure of its capacity and is equal to the residence time when the density of reaction mixture is constant.
    • C. Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty.
    • D. In an ideal tubular flow reactor, mixing takes place in radial direction and there is no mixing in logitudinal direction.
    • Discuss
    • 2. In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.

    • Options
    • A. 35
    • B. 50
    • C. 70
    • D. 85
    • Discuss
    • 3. A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is

    • Options
    • A. 2
    • B. 1
    • C. 0.5
    • D. 0.5
    • Discuss
    • 4. In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the __________ fibres.

    • Options
    • A. viscose rayon
    • B. acrylic
    • C. polyvinyl acetate
    • D. saturated polyester
    • Discuss
    • 5.  for a Tee (used as elbow, entering branch) would be

    • Options
    • A. less than that for Tee (used as elbow, entering run).
    • B. more than that for Tee (used as elbow, entering run).
    • C. around 90.
    • D. both (b) and (c).
    • Discuss
    • 6. Heat of transition is the heat evolved or absorbed, when a substance is converted from

    • Options
    • A. vapor to liquid.
    • B. vapor to solid.
    • C. solid to liquid.
    • D. one allotropic form to another allotropic form.
    • Discuss
    • 7. The combustion reaction, C + O2 = CO2, is

    • Options
    • A. exothermic
    • B. endothermic
    • C. autocatalytic
    • D. none of these
    • Discuss
    • 8. Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is

    • Options
    • A. nylon-66
    • B. teflon
    • C. polyester
    • D. bakelite
    • Discuss
    • 9. The major constituent of laminate of safety glass, which holds the broken glass, pieces in their places during accident (and thus minimises the danger from flying glass fragments) is

    • Options
    • A. polyvinyl alcohol
    • B. polyvinyl acetale
    • C. polyvinyl butyral
    • D. PVC
    • Discuss
    • 10. Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)

    • Options
    • A. acts as a green house gas thereby raising earth's temperature.
    • B. causes asphyxia.
    • C. causes increase in sea level.
    • D. inhances the green house effect.
    • Discuss


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