Part 3: Human Diseases – Bacterial & Viral (25 MCQs)
Part 3: Human Diseases – Bacterial & Viral – Typhoid, Pneumonia, Common Cold, Dengue, Chikungunya (25 MCQs)
Q51. Typhoid fever is caused by:
a) Salmonella typhi
b) Streptococcus pneumoniae
c) Rhinovirus
d) Wuchereria
Answer: a
- a) Correct: Salmonella typhi (bacterium) → typhoid fever.
Q52. Typhoid spreads through:
a) Droplets from coughing
b) Contaminated food and water
c) Mosquito bites
d) Sexual contact
Answer: b
- b) Correct: Typhoid → feco-oral route (contaminated food/water).
Q53. The diagnostic test for typhoid is:
a) ELISA
b) Widal test
c) PCR
d) X-ray
Answer: b
- b) Correct: Widal test detects antibodies against Salmonella.
Q54. Pneumonia is caused by:
a) Streptococcus pneumoniae and Haemophilus influenzae
b) Rhinovirus
c) Salmonella
d) Plasmodium
Answer: a
- a) Correct: Streptococcus pneumoniae, Haemophilus influenzae → pneumonia.
Q55. Pneumonia is transmitted by:
a) Contaminated food
b) Inhalation of droplets/aerosols
c) Mosquito bite
d) Water contamination
Answer: b
- b) Correct: Pneumonia spreads via aerosol droplets from infected person.
Q56. Major symptom of pneumonia:
a) Abdominal pain
b) Fluid-filled alveoli causing breathing difficulty
c) Skin rashes
d) Muscle paralysis
Answer: b
- b) Correct: Pneumonia → alveoli fill with fluid → breathing difficulty, fever, cough.
Q57. Common cold is caused by:
a) Rhinoviruses
b) Salmonella
c) Haemophilus
d) Wuchereria
Answer: a
- a) Correct: Rhinoviruses → common cold.
Q58. Mode of transmission of common cold:
a) Contaminated food
b) Sexual contact
c) Droplets, contaminated objects (fomites)
d) Mosquitoes
Answer: c
- c) Correct: Droplets + fomites spread rhinoviruses.
Q59. Why is common cold difficult to control?
a) Severe symptoms
b) High mutation rate of virus
c) Lack of vaccines
d) All of the above
Answer: d
- d) Correct: Common cold → many strains, mutations, no vaccine.
Q60. Dengue fever is caused by:
a) Aedes aegypti transmitting dengue virus
b) Salmonella typhi
c) Rhinovirus
d) Culex mosquito transmitting virus
Answer: a
- a) Correct: Aedes aegypti mosquito transmits dengue virus.
Q61. Main symptom of dengue fever:
a) High fever with rash and severe joint pain (“break-bone fever”)
b) Intestinal cramps
c) Chronic cough
d) Swelling of lymph nodes
Answer: a
- a) Correct: Dengue → rash, high fever, severe muscle/joint pain.
Q62. Dengue hemorrhagic fever can cause:
a) Pneumonia
b) Internal bleeding and shock
c) Paralysis
d) Kidney failure only
Answer: b
- b) Correct: Severe dengue → internal bleeding, shock.
Q63. Chikungunya is transmitted by:
a) Culex mosquito
b) Aedes aegypti mosquito
c) Anopheles mosquito
d) Sandfly
Answer: b
- b) Correct: Aedes aegypti transmits chikungunya virus.
Q64. Common symptom of chikungunya is:
a) Chronic joint pain with fever
b) Pneumonia
c) Diarrhea
d) Dysentery
Answer: a
- a) Correct: Chronic joint pain + fever is hallmark of chikungunya.
Q65. Typhoid spreads more commonly due to:
a) Aerosols
b) Contaminated food and water
c) Mosquito bite
d) Genetic inheritance
Answer: b
- b) Correct: Typhoid = water/food-borne.
Q66. Carrier of typhoid bacteria is:
a) Mosquito
b) Housefly
c) Healthy individuals harboring Salmonella
d) Aedes
Answer: c
- c) Correct: Example → “Typhoid Mary” was a carrier.
Q67. Which disease is NOT bacterial?
a) Pneumonia
b) Typhoid
c) Tuberculosis
d) Dengue
Answer: d
- d) Correct: Dengue = viral. Others = bacterial.
Q68. Dengue and chikungunya differ because:
a) Different viruses but same vector (Aedes)
b) Same virus but different vectors
c) One bacterial, other viral
d) Both caused by helminths
Answer: a
- a) Correct: Both spread by Aedes, but viruses differ.
Q69. Common cold usually affects:
a) Lungs (alveoli)
b) Nose and respiratory passage (upper tract)
c) Stomach lining
d) Liver
Answer: b
- b) Correct: Rhinoviruses affect upper respiratory tract.
Q70. Incubation period of common cold is:
a) 1–2 days
b) 7–14 days
c) 3–4 weeks
d) Several months
Answer: a
- a) Correct: Common cold develops within 1–2 days of infection.
Q71. Effective prevention of dengue & chikungunya is:
a) Vaccination
b) Mosquito control (remove stagnant water)
c) Antibiotics
d) Antifungals
Answer: b
- b) Correct: No vaccine available → vector control essential.
Q72. Pneumonia differs from common cold because:
a) It affects alveoli, not upper tract
b) Caused by bacteria, not virus
c) More severe with fluid-filled alveoli
d) All of the above
Answer: d
- d) Correct: All statements distinguish pneumonia from common cold.
Q73. Which is known as “break-bone fever”?
a) Typhoid
b) Dengue
c) Chikungunya
d) Pneumonia
Answer: b
- b) Correct: Dengue → severe joint/muscle pain → break-bone fever.
Q74. Which of the following is water-borne?
a) Typhoid
b) Amoebiasis
c) Ascariasis
d) All of these
Answer: d
- d) Correct: All spread via contaminated water/food.
Q75. Which mosquito is the vector for yellow fever (extra info for NEET)?
a) Anopheles
b) Aedes aegypti
c) Culex
d) Mansonia
Answer: b
- b) Correct: Aedes aegypti transmits dengue, chikungunya, yellow fever.
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