Common diseases in humans — NEET Biology Questions

Practice 54 questions on Common diseases in humans from Human Health and Disease (NCERT Class 12, Chapter 7). Free samples below — get all 54 in the app.

54 Questions Human Health and Disease Class 12

Sample Questions — Common diseases in humans

Try 5 questions below from Common diseases in humans. Get all 54 in the MedicNEET app.

MCQ
Pneumonia-causing bacteria infect which part of the human respiratory system?
  • A. Trachea
  • B. Bronchi
  • C. Nasal passage
  • D. Alveoli
✅ Correct Answer: D
Bacteria like Streptococcus pneumoniae and Haemophilus influenzae infect alveoli, leading to fluid accumulation and breathing issues.
MCQ
Q10. Which statement about Common Cold is incorrect?
  • A. It is caused by Rhino virus
  • B. It infects lungs and leads to alveolar damage
  • C. It is spread through contaminated objects
  • D. It usually lasts 3–7 days
✅ Correct Answer: B
It infects the nose and respiratory passage, not the lungs.
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MCQ
What toxic substance released by Plasmodium causes recurring fever in malaria?
  • A. Haemolysin
  • B. Plasminogen
  • C. Haemozoin
  • D. Typhin
✅ Correct Answer: C
Haemozoin is released upon RBC rupture, causing chills and fever every 3–4 days.
MCQ
Q11. Why do Ascaris infections often occur in individuals who consume unwashed vegetables?
  • A. Because the parasite lives on plant roots
  • B. Because eggs contaminate soil, water, and plants
  • C. Due to larvae being airborne
  • D. Due to mosquito bite
✅ Correct Answer: B
Ascaris eggs are excreted in feces and can contaminate vegetables and water sources.
MCQ
Which pathogen causes typhoid fever in humans?
  • A. Vibrio cholerae
  • B. Plasmodium vivax
  • C. Salmonella typhi
  • D. Entamoeba histolytica
✅ Correct Answer: C
Salmonella typhi is a bacterium responsible for typhoid, primarily transmitted through contaminated food and water.

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