MCQ questions for class 9 Science Chapter 13 Why Do We Fall Ill??
Question 1: What is the term for a disease-causing microorganism?
Antigen
Pathogen
Antibody
Virus
Question 2: Which of the following is a communicable disease?
Diabetes
Cancer
Malaria
Arthritis
Question 3: What is the term for an organism that carries and spreads disease without being affected by it?
Carrier
Vector
Host
Parasite
Question 4: What is the primary mode of transmission of waterborne diseases?
Air
Direct contact
Contaminated water
Food
Question 5: Which of the following is an example of a viral disease?
Tuberculosis
Typhoid
Influenza
Malaria
Question 6: What is the term for an abnormal condition or disorder in the body or mind that causes discomfort and dysfunction?
Infection
Inflammation
Disease
Disorder
Question 7: Which of the following is not a method of preventing infectious diseases?
Vaccination
Personal hygiene
Quarantine
Smoking
Question 8: What is the term for a substance that stimulates the production of antibodies and provides immunity against a specific disease?
Antibiotic
Antigen
Antiseptic
Vaccine
Question 9: Which of the following diseases is caused by bacteria?
AIDS
Malaria
Tuberculosis
Dengue
Question 10: What is the term for the period between the entry of a pathogen into the body and the appearance of symptoms of the disease?
Incubation period
Latent period
Infection period
Symptomatic period
Question 11: What is the primary mode of transmission of airborne diseases?
Air
Direct contact
Contaminated water
Food
Question 12: Which of the following is a fungal disease?
Cholera
Ringworm
Dengue
Malaria
Question 13: What is the term for a disease that is constantly present in a population?
Epidemic
Endemic
Pandemic
Outbreak
Question 14: Which of the following is an example of a protozoan disease?
Tuberculosis
Malaria
Influenza
Typhoid
Question 15: What is the term for the process of killing or removing pathogens from a surface or object?
Vaccination
Quarantine
Sterilization
Decontamination
Question 16: What is the term for a substance that kills or inhibits the growth of microorganisms?
Antibiotic
Antigen
Antiseptic
Vaccine
Question 17: Which of the following is a viral disease transmitted by mosquitoes?
Dengue
Tuberculosis
Typhoid
Cholera
Question 18: What is the term for the process of separating and restricting the movement of individuals who may have been exposed to a contagious disease?
Isolation
Quarantine
Vaccination
Sterilization
Question 19: Which of the following is an example of a vector-borne disease?
Tuberculosis
Malaria
Influenza
Typhoid
Question 20: What is the term for a sudden and widespread outbreak of a disease within a specific geographical area?
Epidemic
Endemic
Pandemic
Outbreak
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