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  • Question

  • Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by


  • Options
  • A. dilute HCI
  • B. acetic acid
  • C. concentrated H2SO4
  • D. none of these

  • Correct Answer
  • acetic acid 

    • More questions

    • 1. Waxy crudes are treated with chemical additives mainly to

    • Options
    • A. depress its pour point
    • B. dissolve wax
    • C. precipitate wax
    • D. remove wax
      • Discuss
    • 2. Optimum ratio of operating speed to critical speed of a trommel is

    • Options
    • A. 0.33-0.45
    • B. 1.33-1.45
    • C. 0.5-2
    • D. 1.5-2.5
      • Discuss
    • 3. Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively

    • Options
    • A. - 273° & 80°
    • B. 0° & 80°
    • C. 32° & 460°
    • D. 32° & 80°
      • Discuss
    • 4. Plant tranquillisers

    • Options
    • A. hold back stem growth and halt plants at a desired height.
    • B. cause early maturation of plants.
    • C. accelerate ripening of food and grain.
    • D. produce seedless fruit.
      • Discuss
    • 5. Depreciation

    • Options
    • A. costs (on annual basis) are constant when the straight line method is used for its determination.
    • B. is the unavoidable loss in the value of the plant, equipment and materials with lapse in time.
    • C. does figure in the calculation of income tax liability on cash flows from an investment.
    • D. all (a), (b) and (c).
      • Discuss
    • 6. Number of gm moles of solute dissolved in one litre of a solution is called its

    • Options
    • A. equivalent weight
    • B. molarity
    • C. molality
    • D. normality
      • Discuss
    • 7. Limestone is normally crushed in a

    • Options
    • A. roll crusher
    • B. hammer crusher
    • C. ball mill
    • D. tube mill
      • Discuss
    • 8. Load cells are used for the measurement of

    • Options
    • A. stress
    • B. weight
    • C. strain
    • D. velocity
      • Discuss
    • 9. One micron is equal to __________ cm.

    • Options
    • A. 10-2
    • B. 10-4
    • C. 10-6
    • D. 10-8
      • Discuss
    • 10. Separation of two or more components of a liquid solution can not be achieved by

    • Options
    • A. fractional crystallisation
    • B. liquid extraction
    • C. absorption
    • D. evaporation
      • Discuss

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