Problems, Units and Formulae MCQ

Test your knowledge with important Problems, Units and Formulae MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Problems, Units and Formulae MCQs at Bissoy

• If a sample water has not supplied any heat and having impurities as follows: Mg(HCO3)2=50 mg of CaCO3, MgSO4 = 100mg of CaCO3, CaCl2=200mg of CaCO3, Ca(NO3)2=100mg of CaCO3. Calculate the lime required for treatment of 10000 litres of water.
  ক

  1.82Kg

  খ

  1.50Kg

  গ

  1.45Kg

  ঘ

  1.48Kg
• The biochemical oxygen demand can be given by ___________
  ক

  (Dob – Dos)+dilution factor

  খ

  (Dob – Dos)-dilution factor

  গ

  (Dob – Dos)/dilution factor

  ঘ

  (Dob – Dos)*dilution factor
• In determination of hardness by EDTA method, 50ml of standard hard water required 30ml of EDTA solution while 50ml of sample hard water consumed 20ml of EDTA solution. After boiling 50ml of same sample required 10ml of EDTA solution. Calculate the permanent hardness.
  ক

  322ppm

  খ

  332ppm

  গ

  664ppm

  ঘ

  644ppm
• 50 ml of standard and hard water containing 1mg of pure CaCO3 per ml consumed 10ml of EDTA solution. 50ml of given EDTA sample requires 10ml of same EDTA solution. Calculate the total hardness of water sample in ppm.
  ক

  10ppm

  খ

  100ppm

  গ

  1000ppm

  ঘ

  10000ppm
• One French unit is equal to _________ mg/litre.
  ক

  5

  খ

  10

  গ

  15

  ঘ

  20
• The ppm is one part of calcium carbonate equivalent hardness is present in __________ of water.
  ক

  One

  খ

  One million

  গ

  One billion

  ঘ

  One trillion
• One French unit is equal to __________ ppm.
  ক

  10

  খ

  20

  গ

  30

  ঘ

  40
• 1 degree Clark is equal to ________ ppm.
  ক

  12.3

  খ

  13.3

  গ

  14.3

  ঘ

  15.3
• Hardness in water is expressed in terms of ____________ equivalents.
  ক

  Calcium carbonate

  খ

  Calcium bicarbonate

  গ

  Magnesium hydroxide

  ঘ

  Magnesium oxide