SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs (2026–27) – Assam Eduverse
Gain a clear understanding of health and diseases with SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs (2026–27), prepared as per the latest ASSEB syllabus and updated board exam pattern. These SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs include important objective questions, concept-based MCQs, and case-oriented practice sets to support effective exam preparation.
Designed by Assam Eduverse subject experts, these SEBA Class 9 Science Chapter 13 MCQs cover essential topics such as health and disease, acute and chronic diseases, infectious and non-infectious diseases, causes, prevention and control, vectors, and principles of treatment. Practicing these Why Do We Fall Ill MCQs Class 9 SEBA and Assam Board Class 9 Science objective questions helps build conceptual clarity and awareness of disease prevention. You can also explore more practice from Class 9 Science chapterwise MCQs and SEBA Class 9 MCQs.
Regular practice of these ASSEB Class 9 Science Important MCQs will improve preparation and boost exam performance. For detailed explanations, visit SEBA Class 9 Science Chapter 13 Why Do We Fall Ill Solutions, or explore additional resources like SEBA Class 9 & 10 study materials and SEBA Class 9 syllabus.
SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs – ASSEB 2026–27 Board Exam Practice
Table of Contents
Q1. Health is defined as a state of:
a) Absence of disease only
b) Physical well-being only
c) Physical, mental and social well-being
d) Ability to earn money
Answer: c) Physical, mental and social well-being
Q2. Which of the following is necessary for good health?
a) Only good food
b) Only exercise
c) Clean surroundings and social harmony
d) Only absence of microbes
Answer: c) Clean surroundings and social harmony
Q3. Which of the following is NOT a sign of good health?
a) Ability to function well
b) Mental stress all the time
c) Social well-being
d) Proper functioning of organs
Answer: b) Mental stress all the time
Q4. A disease that lasts for a short period of time is called:
a) Chronic disease
b) Acute disease
c) Genetic disease
d) Deficiency disease
Answer: b) Acute disease
Q5. Tuberculosis is an example of:
a) Acute disease
b) Chronic disease
c) Genetic disease
d) Deficiency disease
Answer: b) Chronic disease
Q6. Symptoms of disease are:
a) What doctors observe
b) Laboratory reports
c) What patients feel
d) X-ray results
Answer: c) What patients feel
Q7. Signs of disease are:
a) What we feel
b) What physicians observe
c) Only fever
d) Only pain
Answer: b) What physicians observe
Q8. Which of the following is an infectious disease?
a) Cancer
b) High blood pressure
c) Tuberculosis
d) Diabetes
Answer: c) Tuberculosis
Q9. Which of the following is a non-infectious disease?
a) Cholera
b) Tuberculosis
c) Cancer
d) Malaria
Answer: c) Cancer
Q10. Diseases caused by viruses include:
a) Typhoid
b) Cholera
c) Common cold
d) Tuberculosis
Answer: c) Common cold
Q11. Cholera spreads mainly through:
a) Air
b) Water
c) Mosquito
d) Direct contact only
Answer: b) Water
Q12. Mosquitoes act as:
a) Hosts
b) Vectors
c) Bacteria
d) Parasites
Answer: b) Vectors
Q13. Antibiotics are effective against:
a) Viruses
b) Bacteria
c) All microbes
d) Fungi only
Answer: b) Bacteria
Q14. Antibiotics do not work against viral infections because viruses:
a) Are very large
b) Do not have their own biochemical machinery
c) Live outside the body
d) Have cell walls
Answer: b) Do not have their own biochemical machinery
Q15. Inflammation causes:
a) Fever and swelling
b) Only itching
c) Only cold
d) Only weakness
Answer: a) Fever and swelling
Q16. If lungs are affected by infection, the symptom is likely to be:
a) Jaundice
b) Cough and breathlessness
c) Fits
d) Loose motions
Answer: b) Cough and breathlessness
Q17. If liver is affected, the disease may show:
a) Cough
b) Jaundice
c) Acne
d) Headache
Answer: b) Jaundice
Q18. The principle of treatment of infectious diseases includes:
a) Only reducing symptoms
b) Only killing microbes
c) Both reducing symptoms and killing microbes
d) Avoiding food
Answer: c) Both reducing symptoms and killing microbes
Q19. Prevention of disease is better than cure because:
a) Treatment is always easy
b) Diseases never spread
c) Treatment takes time and infection may spread
d) Medicines are cheap
Answer: c) Treatment takes time and infection may spread
Q20. Public hygiene helps in:
a) Increasing microbes
b) Reducing exposure to infectious agents
c) Spreading disease
d) Weakening immunity
Answer: b) Reducing exposure to infectious agents
Q21. Assertion: Chronic diseases have long-term effects on health.
Reason: They last for a long time and affect body functioning continuously.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q22. Assertion: Antibiotics are useful in treating common cold.
Reason: Common cold is caused by bacteria.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: d) A is false but R is true
Q23. Assertion: Mosquito control helps in preventing malaria.
Reason: Mosquitoes act as vectors in spreading malaria.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q24. Assertion: Good nourishment helps prevent infectious diseases.
Reason: A strong immune system can fight microbes effectively.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q25. Assertion: All diseases spread from person to person.
Reason: All diseases are caused by microbes.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: d) A is false but R is true
Q26. Assertion: A person can be in poor health without having any identifiable disease.
Reason: Health includes physical, mental and social well-being.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q27. Assertion: Overcrowded living conditions increase the spread of airborne diseases.
Reason: Microbes spread through droplets released during coughing or sneezing.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q28. Assertion: HIV infection weakens the immune system.
Reason: HIV infects and damages cells of the immune system.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q29. Assertion: Vaccination prevents disease by killing microbes directly.
Reason: Vaccination develops memory in the immune system.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is false but R is true
d) A is true but R is false
Answer: c) A is false but R is true
Q30. Assertion: Safe drinking water helps prevent cholera.
Reason: Cholera spreads through contaminated water.
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is the correct explanation of A
Q31. Which of the following are components of good health?
i) Physical well-being
ii) Mental well-being
iii) Social well-being
iv) Only absence of disease
a) i and ii
b) i, ii and iii
c) ii and iv
d) i, ii, iii and iv
Answer: b) i, ii and iii
Q32. Which of the following are infectious diseases?
i) Malaria
ii) Tuberculosis
iii) Diabetes
iv) Cholera
a) i and ii
b) i, ii and iv
c) ii and iii
d) i, ii, iii and iv
Answer: b) i, ii and iv
Q33. Which of the following are caused by bacteria?
i) Cholera
ii) Typhoid
iii) Tuberculosis
iv) Common cold
a) i and ii
b) i, ii and iii
c) ii and iv
d) i, ii, iii and iv
Answer: b) i, ii and iii
Q34. Which of the following diseases are spread by mosquitoes?
i) Malaria
ii) Japanese encephalitis
iii) Cholera
iv) Dengue
a) i and ii
b) i, ii and iv
c) ii and iii
d) i, ii, iii and iv
Answer: b) i, ii and iv
Q35. Which of the following are methods of disease transmission?
i) Air
ii) Water
iii) Vectors
iv) Proper sanitation
a) i and ii
b) i, ii and iii
c) ii and iv
d) i, ii, iii and iv
Answer: b) i, ii and iii
Q36. Which of the following are symptoms of disease?
i) Headache
ii) Fever
iii) Loose motions
iv) Laboratory report
a) i and ii
b) i, ii and iii
c) ii and iv
d) i, ii, iii and iv
Answer: b) i, ii and iii
Q37. Which of the following are general methods of preventing infectious diseases?
i) Public hygiene
ii) Safe drinking water
iii) Immunisation
iv) Ignoring illness
a) i and ii
b) i, ii and iii
c) ii and iv
d) i, ii, iii and iv
Answer: b) i, ii and iii
Q38. Which of the following are characteristics of viruses?
i) Live inside host cells
ii) Have few biochemical mechanisms of their own
iii) Easily killed by antibiotics
iv) Use host machinery
a) i and ii
b) i, ii and iv
c) ii and iii
d) i, ii, iii and iv
Answer: b) i, ii and iv
Q39. Which of the following are effects of inflammation?
i) Swelling
ii) Pain
iii) Fever
iv) Hair fall
a) i and ii
b) i, ii and iii
c) ii and iv
d) i, ii, iii and iv
Answer: b) i, ii and iii
Q40. Which of the following statements about chronic diseases are correct?
i) They last for a long time
ii) They can affect general health severely
iii) They always spread by contact
iv) They may reduce ability to work
a) i and ii
b) i, ii and iv
c) ii and iii
d) i, ii, iii and iv
Answer: b) i, ii and iv
Q41. Match the following:
| Column I | Column II |
|---|---|
| A. Acute disease | 1. Lasts for short duration |
| B. Chronic disease | 2. Observed by doctor |
| C. Symptom | 3. Felt by patient |
| D. Sign | 4. Lasts for long duration |
a) A-1, B-4, C-3, D-2
b) A-4, B-1, C-2, D-3
c) A-1, B-3, C-4, D-2
d) A-2, B-4, C-3, D-1
Answer: a) A-1, B-4, C-3, D-2
Q42. Match the following:
| Column I | Column II |
|---|---|
| A. Cholera | 1. Mosquito |
| B. Tuberculosis | 2. Airborne |
| C. Malaria | 3. Waterborne |
| D. AIDS | 4. HIV |
a) A-3, B-2, C-1, D-4
b) A-2, B-3, C-4, D-1
c) A-1, B-2, C-3, D-4
d) A-3, B-1, C-2, D-4
Answer: a) A-3, B-2, C-1, D-4
Q43. Match the following:
| Column I | Column II |
|---|---|
| A. Bacteria | 1. Malaria |
| B. Virus | 2. Cholera |
| C. Protozoa | 3. Common cold |
| D. Worm | 4. Ascaris |
a) A-2, B-3, C-1, D-4
b) A-3, B-2, C-4, D-1
c) A-1, B-4, C-2, D-3
d) A-4, B-1, C-3, D-2
Answer: a) A-2, B-3, C-1, D-4
Q44. Match the following:
| Column I | Column II |
|---|---|
| A. Liver infection | 1. Jaundice |
| B. Lung infection | 2. Cough |
| C. Brain infection | 3. Fits |
| D. Gut infection | 4. Loose motions |
a) A-1, B-2, C-3, D-4
b) A-2, B-1, C-4, D-3
c) A-3, B-2, C-1, D-4
d) A-1, B-3, C-2, D-4
Answer: a) A-1, B-2, C-3, D-4
Q45. Match the following:
| Column I | Column II |
|---|---|
| A. Penicillin | 1. Prevents cholera |
| B. Vaccination | 2. Kills bacteria |
| C. Mosquito control | 3. Prevents malaria |
| D. Safe water | 4. Develops immunity |
a) A-2, B-4, C-3, D-1
b) A-4, B-2, C-1, D-3
c) A-3, B-1, C-4, D-2
d) A-2, B-3, C-4, D-1
Answer: a) A-2, B-4, C-3, D-1
Q46. Match the following:
| Column I | Column II |
|---|---|
| A. Air | 1. AIDS |
| B. Water | 2. Cholera |
| C. Vector | 3. Tuberculosis |
| D. Sexual contact | 4. Malaria |
a) A-3, B-2, C-4, D-1
b) A-2, B-3, C-1, D-4
c) A-4, B-1, C-3, D-2
d) A-1, B-4, C-2, D-3
Answer: a) A-3, B-2, C-4, D-1
Q47. Match the following:
| Column I | Column II |
|---|---|
| A. Inflammation | 1. Long-lasting |
| B. Immune system | 2. Kills bacteria |
| C. Antibiotic | 3. Swelling and pain |
| D. Chronic disease | 4. Fights infection |
a) A-3, B-4, C-2, D-1
b) A-4, B-3, C-1, D-2
c) A-2, B-1, C-3, D-4
d) A-1, B-2, C-4, D-3
Answer: a) A-3, B-4, C-2, D-1
Q48. Match the following:
| Column I | Column II |
|---|---|
| A. Virus | 1. Elephantiasis |
| B. Bacteria | 2. Tuberculosis |
| C. Protozoa | 3. Dengue |
| D. Worm | 4. Kala-azar |
a) A-3, B-2, C-4, D-1
b) A-2, B-3, C-1, D-4
c) A-1, B-4, C-2, D-3
d) A-4, B-1, C-3, D-2
Answer: a) A-3, B-2, C-4, D-1
Q49. Match the following:
| Column I | Column II |
|---|---|
| A. Smallpox | 1. Developed resistance |
| B. Edward Jenner | 2. English physician |
| C. Vaccination | 3. Related virus |
| D. Cowpox | 4. Eradicated disease |
a) A-4, B-2, C-1, D-3
b) A-2, B-1, C-4, D-3
c) A-3, B-4, C-2, D-1
d) A-1, B-3, C-2, D-4
Answer: a) A-4, B-2, C-1, D-3
Q50. Match the following:
| Column I | Column II |
|---|---|
| A. Safe drinking water | 1. Prevents waterborne diseases |
| B. Balanced diet | 2. Strengthens immune system |
| C. Public hygiene | 3. Reduces exposure to microbes |
| D. Immunisation | 4. Provides specific protection |
a) A-1, B-2, C-3, D-4
b) A-2, B-1, C-4, D-3
c) A-3, B-4, C-1, D-2
d) A-4, B-3, C-2, D-1
Answer: a) A-1, B-2, C-3, D-4
SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs – Important Objective Questions
A strong understanding of Why Do We Fall Ill is essential not only for scoring well in examinations but also for building awareness about health and disease prevention. Practicing MCQs based on the latest SEBA (ASSEB) syllabus helps students revise important concepts effectively and become familiar with the pattern of objective questions asked in exams.
These SEBA Class 9 Science Chapter 13 MCQs cover key areas such as types of diseases, causes of infectious and non-infectious diseases, role of vectors like mosquitoes, methods of prevention, vaccination, and basic principles of treatment. Regular practice of these topics enables students to clearly differentiate between concepts and avoid confusion during exams.
Solving such important objective questions for Class 9 Science also improves analytical thinking and helps students apply their knowledge to real-life situations related to health and hygiene. Questions based on disease control and public health become easier to understand when practiced through exam-oriented MCQs.
Consistent revision through MCQs enhances accuracy and confidence, allowing students to answer quickly and correctly under exam conditions. It also supports quick recap before tests, making preparation more structured and effective.
To achieve better results in school exams and board-based assessments, students should make these MCQs a regular part of their study routine. With proper understanding and continuous practice, this chapter can be scored easily while also gaining valuable knowledge about maintaining good health.
FAQs – SEBA Class 9 Science Chapter 13 Why Do We Fall Ill MCQs
1. How many MCQs come from Why Do We Fall Ill in SEBA Class 9 exam?
Usually 3–5 MCQs appear, but ASSEB guidelines mention up to 45 MCQs overall. Focus on definitions and disease types for better scoring.
2. Which are the most important MCQs from Chapter 13 Why Do We Fall Ill?
Questions on infectious vs non-infectious diseases, immunity, and antibiotics are most important. Revise NCERT examples carefully—they are often repeated.
3. Is Why Do We Fall Ill chapter difficult for Class 9 SEBA students?
No, it’s easy if you understand concepts clearly. Focus on keywords like pathogens and prevention methods instead of memorizing blindly.
4. Where can I download SEBA Class 9 Why Do We Fall Ill MCQs PDF?
You can find chapter-wise MCQs PDFs on Assam Eduverse and similar sites. Always practice from updated ASSEB pattern-based question sets.
5. How to prepare MCQs for Why Do We Fall Ill quickly before exam?
Start with NCERT line-by-line reading, then solve MCQs daily. Focus more on concepts like transmission and prevention—they come frequently.
6. Are NCERT-based MCQs enough for SEBA Class 9 Chapter 13 exams?
Yes, mostly NCERT-based MCQs are asked. But practicing extra MCQs from Assam Eduverse helps you handle tricky and application-based questions confidently.
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