CBSE  /  Class 9  /  Science  /  Why do we Fall Ill

  • 1. 
    If you live in a overcrowded and poorly ventilated house, it is possible that you may suffer from which of the following diseases:

  • Cancer
  • AIDS
  • Air borne diseases
  • Cholera

  • 2. 
    Which disease is not transmitted by mosquitoes?

  • Dengue
  • Malaria
  • Brain fever or encephalitis
  • Pneumonia

  • 3. 
    Which one of the following is not important for individual health?

  • Living in clean space
  • Good economic condition
  • Social equality and harmony
  • Living in a large and well furnished house

  • 4. 
    Choose the wrong statement.

  • High blood pressure is caused by excessive weight and lack of exercise.
  • Cancers can be caused by genetic abnormalities.
  • Peptic ulcers are caused by eating acidic food.
  • Acne in not caused by staphylococci.

  • 5. 
    We should not allow mosquitoes to breed in our surroundings because they

  • multiply very fast and cause pollution
  • are vectors for many diseases
  • bite and cause skin diseases
  • are not important insects

  • 6. 
    You are aware of Polio Eradication Programme in your city. Children are vaccinated because

  • 7. 
    Viruses, which cause hepatitis, are transmitted through

  • air
  • water
  • food
  • personal contact

  • 8. 
    Vectors can be defined as

  • animals carry the infecting agents from sick person to another healthy person
  • microorganisms which cause many diseases
  • infected person
  • diseased plants
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