1. Which of the following is a communicable disease?
A) Diabetes
B) Tuberculosis
C) Arthritis
D) Hypertension
Answer: B) Tuberculosis
2. The first line of defense in the human immune system is:
A) White blood cells
B) Skin and mucous membranes
C) Antibodies
D) Lymph nodes
Answer: B) Skin and mucous membranes
3. Which type of pathogen causes malaria?
A) Virus
B) Bacteria
C) Protozoa
D) Fungus
Answer: C) Protozoa
4. Vaccines are used to:
A) Cure diseases
B) Provide active immunity
C) Kill pathogens directly
D) Reduce symptoms only
Answer: B) Provide active immunity
5. Which of the following is an autoimmune disease?
A) Rheumatoid arthritis
B) Influenza
C) Typhoid
D) Measles
Answer: A) Rheumatoid arthritis
6. The term “pathogen” refers to:
A) A type of antibody
B) A disease-causing microorganism
C) A healthy cell
D) A vaccine
Answer: B) A disease-causing microorganism
7. Which of the following cells produce antibodies?
A) T-cells
B) B-cells
C) Macrophages
D) Platelets
Answer: B) B-cells
8. Which disease is caused by a virus?
A) Tuberculosis
B) Malaria
C) Influenza
D) Cholera
Answer: C) Influenza
9. Which of the following is a vector-borne disease?
A) Measles
B) Dengue
C) Pneumonia
D) Tetanus
Answer: B) Dengue
10. The immunity acquired from mother to child through breast milk is called:
A) Active immunity
B) Passive immunity
C) Artificial immunity
D) Herd immunity
Answer: B) Passive immunity
11. Which vitamin is essential for maintaining a strong immune system?
A) Vitamin A
B) Vitamin C
C) Vitamin D
D) All of the above
Answer: D) All of the above
12. Antibiotics are effective against:
A) Viruses only
B) Bacteria only
C) Fungi only
D) All pathogens
Answer: B) Bacteria only
13. Which disease is caused by a deficiency of insulin?
A) Diabetes mellitus
B) Anemia
C) Scurvy
D) Goiter
Answer: A) Diabetes mellitus
14. Which type of immunity is obtained through vaccination?
A) Natural active immunity
B) Artificial active immunity
C) Artificial passive immunity
D) Natural passive immunity
Answer: B) Artificial active immunity
15. Which immune cells act as the first line of cellular defense against infection?
A) Neutrophils
B) B-cells
C) T-helper cells
D) Plasma cells
Answer: A) Neutrophils
16. Which of the following diseases is caused by a fungus?
A) Ringworm
B) Typhoid
C) Measles
D) Malaria
Answer: A) Ringworm
17. The process of destroying harmful microorganisms in food and water is called:
A) Sterilization
B) Immunization
C) Vaccination
D) Fermentation
Answer: A) Sterilization
18. Which of the following is a symptom of an allergic reaction?
A) Fever
B) Rash and itching
C) Hair loss
D) Weak bones
Answer: B) Rash and itching
19. Which type of white blood cells are known as “killer cells”?
A) B-cells
B) Helper T-cells
C) Cytotoxic T-cells
D) Macrophages
Answer: C) Cytotoxic T-cells
20. Herd immunity helps in:
A) Treating infected individuals
B) Preventing the spread of contagious diseases
C) Boosting nutrition
D) Reducing autoimmune diseases
Answer: B) Preventing the spread of contagious diseases
21. Cholera is primarily transmitted through:
A) Air
B) Water
C) Mosquito bite
D) Direct contact
Answer: B) Water
22. Which of the following is a chronic inflammatory disease?
A) Asthma
B) Influenza
C) Smallpox
D) Chickenpox
Answer: A) Asthma
23. Interferons are chemicals produced by the body to fight:
A) Bacteria
B) Viruses
C) Fungi
D) Parasites
Answer: B) Viruses
24. Which disease is caused by deficiency of Vitamin C?
A) Rickets
B) Scurvy
C) Beriberi
D) Night blindness
Answer: B) Scurvy
25. Passive immunity can be provided artificially through:
A) Vaccination
B) Serum therapy
C) Exposure to pathogens
D) Natural infection
Answer: B) Serum therapy
26. Which of the following is a sexually transmitted disease (STD)?
A) Hepatitis A
B) HIV/AIDS
C) Chickenpox
D) Typhoid
Answer: B) HIV/AIDS
27. Which is the main lymphoid organ involved in immunity?
A) Heart
B) Spleen
C) Stomach
D) Kidney
Answer: B) Spleen
28. The “memory cells” in the immune system help in:
A) Producing hormones
B) Faster response to previously encountered pathogens
C) Producing red blood cells
D) Triggering fever
Answer: B) Faster response to previously encountered pathogens
29. Which of the following is NOT a symptom of malaria?
A) Chills and fever
B) Anemia
C) Coughing blood
D) Sweating
Answer: C) Coughing blood
30. The principle behind vaccination was discovered by:
A) Louis Pasteur
B) Robert Koch
C) Edward Jenner
D) Alexander Fleming
Answer: C) Edward Jenner