Diseases and Their Causes (Viral, Bacterial, Genetic) MCQs

1. Which of the following diseases is caused by a virus?
(A) Tuberculosis
(B) Malaria
(C) Influenza
(D) Cholera

2. Tuberculosis is caused by which bacterium?
(A) Mycobacterium tuberculosis
(B) Salmonella typhi
(C) Streptococcus pneumoniae
(D) Vibrio cholerae

3. Down syndrome is a genetic disorder caused by:
(A) A bacterial infection
(B) A virus
(C) An extra copy of chromosome 21
(D) A vitamin deficiency

4. Which of the following diseases is caused by a protozoan parasite?
(A) Typhoid
(B) Malaria
(C) Measles
(D) Hepatitis B

5. Which bacterial disease spreads through contaminated water?
(A) Cholera
(B) HIV/AIDS
(C) Chickenpox
(D) Rabies

6. The common cold is caused by which virus?
(A) Rhinovirus
(B) Hepatitis virus
(C) Rabies virus
(D) Mycobacterium tuberculosis

7. Which genetic disorder affects the production of hemoglobin?
(A) Cystic fibrosis
(B) Thalassemia
(C) Polio
(D) Dengue

8. Hepatitis B primarily affects which organ?
(A) Heart
(B) Brain
(C) Liver
(D) Kidneys

9. Which of the following diseases is NOT caused by bacteria?
(A) Tetanus
(B) Diphtheria
(C) Measles
(D) Plague

10. Polio is caused by which type of pathogen?
(A) Bacteria
(B) Virus
(C) Fungi
(D) Protozoa

11. Which of the following is a bacterial disease?
(A) Dengue
(B) Tetanus
(C) COVID-19
(D) Smallpox

12. The causative agent of typhoid fever is:
(A) Vibrio cholerae
(B) Plasmodium
(C) Salmonella typhi
(D) Mycobacterium leprae

13. Sickle cell anemia is caused by:
(A) A virus
(B) A bacterial infection
(C) A genetic mutation
(D) A vitamin deficiency

14. HIV primarily attacks which type of cells in the human body?
(A) Red blood cells
(B) White blood cells (CD4 T-cells)
(C) Liver cells
(D) Brain cells

15. Rabies is transmitted through:
(A) Contaminated food
(B) Airborne droplets
(C) The bite of an infected animal
(D) Mosquito bites

16. Which disease is known as “Black Death” and was caused by Yersinia pestis?
(A) Cholera
(B) Plague
(C) Tuberculosis
(D) Anthrax

17. The genetic disorder in which mucus builds up in the lungs and digestive system is:
(A) Down syndrome
(B) Cystic fibrosis
(C) Hemophilia
(D) Sickle cell anemia

18. COVID-19 is caused by which virus?
(A) SARS-CoV-2
(B) Influenza virus
(C) HIV
(D) Hepatitis B virus

19. Which of the following diseases is NOT a genetic disorder?
(A) Hemophilia
(B) Tuberculosis
(C) Sickle cell anemia
(D) Down syndrome

20. Lyme disease is caused by:
(A) A virus
(B) A bacterium
(C) A genetic mutation
(D) A fungus