Disolved oxygen (DO) in water should be...? Mcqs

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Disolved oxygen (DO) in water should be...?

(A) 400 to 800 ppm
(B) 4000 to 8000 ppm

(C) 0.4 to 0.5 ppm
(D) 4 to 5 ppm

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Detergents dissolved in water help in cleaning clothes by_________...?

(A) Increasing the temperature of water
(B) Reacting chemically with dirt

(C) Reducing the surface tension of water
(D) Dissolving dirt

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Which salts are excessively dissolved to make temporary hard water...?

(A) CaSO4 and CaCl2
(B) KNO3 and KOH

(C) CaCO3 and Ca(OH)2
(D) Ca(HCO3)2 and Mg(HCO3)2

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Which mineral is makes red blood cells and it involved in oxygen transport and storage for energy conversions...?

(A) Magnesium
(B) Sodium

(C) Copper
(D) Iron

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Which one of the following gases is readily soluble in water at room temperature...?

(A) Chlorine
(B) Nitrogen

(C) Ammonia
(D) Carbon dioxide

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Which dissolves in water to form salt and water mixture...?

(A) Gas
(B) Liquid

(C) Solid
(D) None

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Which of the following organisms releases molecular oxygen into water...?

(A) E.coli
(B) Phytoplankton

(C) Amoeba
(D) Salmonella

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