Which of the following factors help to measure quallity of water ?
Correct answer: D. all of the above
- A. DO
- B. BOD
- C. COD
- D. all of the above
Explanation
Dissolved oxygen, biochemical oxygen demand and chemical oxygen demand each provide information about water quality: DO indicates available oxygen, while BOD and COD indicate oxygen-consuming pollution. A student may choose BOD alone because it is a familiar pollution index, but all three are used.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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