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  • Question
  • Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.


  • Options
  • A. hydrocarbons
  • B. hydrogen flouride
  • C. hydrogen sulphides
  • D. nitrogen dioxide

  • Correct Answer
  • hydrogen flouride 


  • More questions

    • 1. Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.

    • Options
    • A. 105
    • B. 135
    • C. 160
    • D. 185
    • Discuss
    • 2. Overall efficiency of the distillation column is

    • Options
    • A. the ratio of number of ideal plates to actual plates.
    • B. the ratio of number of actual plates to ideal plates.
    • C. same as the Murphree efficiency.
    • D. always more than the point efficiency.
    • Discuss
    • 3. Bucket elevators are not suitable for the vertical lifting of __________ materials.

    • Options
    • A. fine (e.g. - 200 mesh size coal)
    • B. sticky (e.g. clay paste)
    • C. small lumpy (e.g. grains and sand)
    • D. free flowing
    • Discuss
    • 4. Water separometer index (modified) (WSIM) of a petrofuel is the measure of its

    • Options
    • A. emulsification tendency.
    • B. water separation characteristics.
    • C. water content.
    • D. water absorbing capacity from atmosphere.
    • Discuss
    • 5. The most suitable solvent for deasphalting vacuum residue is

    • Options
    • A. propane
    • B. methyl ethyl ketone
    • C. doctor's solution
    • D. methanol amine
    • Discuss
    • 6. A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

    • Options
    • A. Kc is reduced.
    • B. Kc is increased.
    • C. integral control action is introduced.
    • D. derivative control action is introduced.
    • Discuss
    • 7. A tube mill as compared to a ball mill

    • Options
    • A. employs smaller balls.
    • B. gives finer size reduction but consumes more power.
    • C. has larger length/diameter ratio (>2 as compared to 1 for ball mill).
    • D. all (a), (b) and (c).
    • Discuss
    • 8. Pick out the wrong statement.

    • Options
    • A. Pensky-Marten apparatus is used for determining flash points above 50°C.
    • B. Characterisation factor of paraffinic crude oil is more than 12.
    • C. Abel apparatus is used for determining flash points below 50°C.
    • D. An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index.
    • Discuss
    • 9. Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

    • Options
    • A. 35
    • B. 75
    • C. 95
    • D. 105
    • Discuss
    • 10. Vulcanisation of rubber does not increase its

    • Options
    • A. elasticity
    • B. plasticity
    • C. ductility
    • D. none of these
    • Discuss


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