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

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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

✅ Correct Answer: 4 to 5 ppm

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Source: This question is taken from the Everyday Science

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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

✅ Correct Answer: Ca(HCO3)2 and Mg(HCO3)2

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Source: This question is taken from the Everyday Science

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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

✅ Correct Answer: Ammonia

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Source: This question is taken from the Everyday Science

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

(A) E.coli

(B) Phytoplankton

(C) Amoeba

(D) Salmonella

✅ Correct Answer: Phytoplankton

Comments

Source: This question is taken from the Everyday Science

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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

✅ Correct Answer: Reducing the surface tension of water

Comments

Source: This question is taken from the Everyday Science

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

(A) Gas

(B) Liquid

(C) Solid

(D) None

✅ Correct Answer: Solid

Comments

Source: This question is taken from the Everyday Science

Latest MCQs

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

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