Class VII

Which of the following is an organic impurity in sewage water?
  1. Human faeces
  2. Nitrates
  3. Vibrio cholera
  4. None of these
Jaundice affects which organ?
  1. Liver 
  2. Stomach 
  3. Lungs 
  4. Heart 
Which of the following is not a source of wastewater?
  1. Industries
  2. Houses
  3. sewers
  4. Hospitals
Which of the following is non-biodegradable?
  1. Cotton cloth
  2. Cardboard
  3. Glass bottle
  4. Leather shoes
Biogas is used as
  1. source of energy
  2. waste disposal
  3. both of these
  4. none of these
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