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Diseases and Health — Questions and Answers

Diseases and Health questions ask which pathogen causes which illness, how it spreads, and which organ it attacks. Exam setters concentrate on the major communicable diseases and the distinction between bacterial, viral and vector-borne illness — a distinction that also determines whether antibiotics are of any use.

10 solved questionsGeneral ScienceFree · no signup

Diseases and Health— Concepts, Formulas & Shortcuts

  • Bacterial diseases: tuberculosis, typhoid, cholera, tetanus.
  • Viral diseases: influenza, measles, polio, dengue, rabies, chickenpox.
  • Vector-borne: malaria and dengue spread by mosquitoes.
  • Malaria is caused by the protozoan Plasmodium, carried by the female Anopheles mosquito.
  • Dengue is spread by the Aedes aegypti mosquito, which bites during the day.
  • Antibiotics work against bacteria, not viruses.

Diseases and Health Practice Questions with Answers

Attempt each question first, then open the explanation. All 10 questions below are free to read and require no signup.

  1. Q1.Malaria is caused by:

    Moderate
    • AA bacterium
    • BA virus
    • CA protozoan
    • DA fungus
    +Show Answer & Explanation

    Answer: C. A protozoan

    Explanation: Malaria is caused by Plasmodium, a protozoan parasite carried by mosquitoes.

    Diseases and Health question 1 of 10

  2. Q2.Which mosquito transmits dengue?

    Moderate
    • AAnopheles
    • BAedes aegypti
    • CCulex
    • DMansonia
    +Show Answer & Explanation

    Answer: B. Aedes aegypti

    Explanation: Aedes aegypti spreads dengue and bites mainly during the day.

    Diseases and Health question 2 of 10

  3. Q3.Tuberculosis primarily affects which organ?

    Easy
    • ALiver
    • BLungs
    • CKidney
    • DHeart
    +Show Answer & Explanation

    Answer: B. Lungs

    Explanation: Pulmonary tuberculosis attacks the lungs, though it can spread elsewhere.

    Diseases and Health question 3 of 10

  4. Q4.Which of these is a viral disease?

    Moderate
    • ATyphoid
    • BCholera
    • CMeasles
    • DTetanus
    +Show Answer & Explanation

    Answer: C. Measles

    Explanation: Measles is viral; typhoid, cholera and tetanus are bacterial.

    Diseases and Health question 4 of 10

  5. Q5.Antibiotics are effective against:

    Moderate
    • AViruses
    • BBacteria
    • CBoth equally
    • DNeither
    +Show Answer & Explanation

    Answer: B. Bacteria

    Explanation: Antibiotics target bacterial structures, which viruses lack.

    Diseases and Health question 5 of 10

  6. Q6.Rabies is transmitted mainly through:

    Easy
    • AMosquito bites
    • BContaminated water
    • CThe bite of an infected animal
    • DAir
    +Show Answer & Explanation

    Answer: C. The bite of an infected animal

    Explanation: The rabies virus is transmitted in the saliva of an infected animal, usually through a bite.

    Diseases and Health question 6 of 10

  7. Q7.Cholera spreads chiefly through:

    Easy
    • AAir
    • BContaminated food and water
    • CInsect bites
    • DDirect touch
    +Show Answer & Explanation

    Answer: B. Contaminated food and water

    Explanation: Cholera is a water-borne bacterial disease linked to poor sanitation.

    Diseases and Health question 7 of 10

  8. Q8.Which disease is prevented by the BCG vaccine?

    Moderate
    • APolio
    • BTuberculosis
    • CMeasles
    • DHepatitis
    +Show Answer & Explanation

    Answer: B. Tuberculosis

    Explanation: The BCG vaccine protects against tuberculosis and is given at birth in India.

    Diseases and Health question 8 of 10

  9. Q9.Which of these is a deficiency disease rather than an infectious one?

    Moderate
    • AMalaria
    • BScurvy
    • CTyphoid
    • DInfluenza
    +Show Answer & Explanation

    Answer: B. Scurvy

    Explanation: Scurvy results from a lack of vitamin C, not from any pathogen.

    Diseases and Health question 9 of 10

  10. Q10.Polio is caused by:

    Easy
    • AA bacterium
    • BA virus
    • CA fungus
    • DA protozoan
    +Show Answer & Explanation

    Answer: B. A virus

    Explanation: Poliomyelitis is caused by the poliovirus and is prevented by oral or injected vaccine.

    Diseases and Health question 10 of 10

Diseases and Health — Frequently Asked Questions

Why do antibiotics not work against viral infections?+

Antibiotics target bacterial structures and processes such as the cell wall, which viruses do not possess. Taking them for a viral illness gives no benefit and drives antibiotic resistance.

Which mosquito spreads malaria and which spreads dengue?+

Malaria is transmitted by the female Anopheles mosquito, while dengue is spread by Aedes aegypti — a daytime biter, which is why bed nets alone do not prevent it.

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