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Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.
  • a)
    highly polluted.
  • b)
    rich in dissolved oxygen.
  • c)
    poor in dissolved oxygen.
  • d)
    not suitable for aquatic life.
Correct answer is option 'B'. Can you explain this answer?
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Biochemical Oxygen Demand, (BOD) is a measure of organic material pres...
This means water sample is rich in dissolved oxygen.
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Biochemical Oxygen Demand, (BOD) is a measure of organic material pres...
Biochemical Oxygen Demand (BOD)

Biochemical Oxygen Demand (BOD) is a measure of the amount of organic material present in water. It is an important parameter used to assess the quality of water in terms of its pollution levels and the availability of dissolved oxygen.

Importance of Dissolved Oxygen

Dissolved oxygen is crucial for the survival of aquatic organisms as it supports their respiration. It is the oxygen that is present in water and available for use by aquatic organisms. Adequate levels of dissolved oxygen are necessary for the survival of fish, insects, and other aquatic organisms.

Interpretation of BOD Values

BOD values are measured in parts per million (ppm). The lower the BOD value, the better the water quality in terms of organic pollution. Here's how to interpret different ranges of BOD values:

1. BOD less than 5 ppm: This indicates that the water sample is rich in dissolved oxygen. Aquatic organisms can thrive in such conditions as there is sufficient oxygen available for respiration. Therefore, the correct option is B - "rich in dissolved oxygen."

2. BOD between 5 and 20 ppm: This range indicates moderate pollution levels. The water may still support some aquatic life, but the oxygen levels might be lower than optimal.

3. BOD greater than 20 ppm: This indicates high levels of organic pollution. The high BOD value suggests that there is a significant amount of organic material present in the water, which consumes a large amount of dissolved oxygen during decomposition. As a result, the water becomes depleted of oxygen, making it unsuitable for most aquatic organisms.

Conclusion

In conclusion, a BOD value less than 5 ppm indicates that the water sample is rich in dissolved oxygen. This means that the water is of good quality in terms of organic pollution and can support a diverse range of aquatic life.
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Attempt All Questions sub parts from each question.Elasticity vs. plasticity: Objects get deformed when pushed, pulled, and twisted. Elasticity is the measure of the amount that the object can return to its original shape after these external forces and pressure are removed. The opposite of elasticity is plasticity. When something is stretched, and it stays stretched, the material is said to be plastic. Such deformation is said to be plastic deformation. In elastic deformation, atoms of the material are displaced temporarily from their original lattice site. They return back to their original position after the removal of external force. In plastic deformation, atoms of the solid are displaced permanently from their original lattice site. They don’t return back to the original position even after the removal of external load. So, elastic deformation is temporary, whereas plastic deformation is permanent. Amount of elastic deformation is very small. But the amount of plastic deformation is quite large. External force required for elastic deformation of solid is quite small. Force required for plastic deformation is much higher. Total energy absorbed by the material during elastic and plastic deformation region is called modulus of toughness. Energy absorbed by the material during elastic deformation is called module of resilience. Most materials have an amount of force or pressure for which they deform elastically. If more force or pressure is applied, then they undergo plastic deformation. Materials those have a fair amount of plastic deformation before breaking are said to be ductile. Materials those cant stretch or bend much without breaking are said to be brittle. Copper, aluminium etc. are ductile materials. For this reason those are used for making wires. Glass and ceramics are often brittle; they will not bend; they will break.Q. Which of the following 4 stress-strain graphs represent a ductile material and a brittle material?

Attempt All Questions sub parts from each question.Elasticity vs. plasticity: Objects get deformed when pushed, pulled, and twisted. Elasticity is the measure of the amount that the object can return to its original shape after these external forces and pressure are removed. The opposite of elasticity is plasticity. When something is stretched, and it stays stretched, the material is said to be plastic. Such deformation is said to be plastic deformation. In elastic deformation, atoms of the material are displaced temporarily from their original lattice site. They return back to their original position after the removal of external force. In plastic deformation, atoms of the solid are displaced permanently from their original lattice site. They don’t return back to the original position even after the removal of external load. So, elastic deformation is temporary, whereas plastic deformation is permanent. Amount of elastic deformation is very small. But the amount of plastic deformation is quite large. External force required for elastic deformation of solid is quite small. Force required for plastic deformation is much higher. Total energy absorbed by the material during elastic and plastic deformation region is called modulus of toughness. Energy absorbed by the material during elastic deformation is called module of resilience. Most materials have an amount of force or pressure for which they deform elastically. If more force or pressure is applied, then they undergo plastic deformation. Materials those have a fair amount of plastic deformation before breaking are said to be ductile. Materials those can't stretch or bend much without breaking are said to be brittle. Copper, aluminium etc. are ductile materials. For this reason those are used for making wires. Glass and ceramics are often brittle; they will not bend; they will break.Q. Hooks law is applicable for

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Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.a)highly polluted.b)rich in dissolved oxygen.c)poor in dissolved oxygen.d)not suitable for aquatic life.Correct answer is option 'B'. Can you explain this answer?
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Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.a)highly polluted.b)rich in dissolved oxygen.c)poor in dissolved oxygen.d)not suitable for aquatic life.Correct answer is option 'B'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.a)highly polluted.b)rich in dissolved oxygen.c)poor in dissolved oxygen.d)not suitable for aquatic life.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.a)highly polluted.b)rich in dissolved oxygen.c)poor in dissolved oxygen.d)not suitable for aquatic life.Correct answer is option 'B'. Can you explain this answer?.
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