Looking for authentic SEBA Class 9 Science Chapter 13 (Why Do We Fall Ill) MCQ solutions for the 2026–27 academic year? Access complete multiple-choice questions on acute vs. chronic conditions, infectious agents, modes of disease transmission, immunity, and vaccination with correct options and clear explanations to score top marks in your exams.
MCQ
1. Health means—
a) Only being free from disease
b) Complete physical, mental, and social well-being
c) Eating healthy food only
d) Strong muscles and bones
Answer: b
2. A person may be disease-free but still not healthy because—
a) He may be sad or stressed
b) He eats too much
c) He plays too much
d) He studies less
Answer: a
3. Which of the following affects health the most?
a) Personal hygiene only
b) Community environment only
c) Only food habits
d) Personal and community factors
Answer: d
4. Which is a symptom of disease?
a) Fever
b) Blood test result
c) X-ray image
d) Doctor’s observation
Answer: a
5. Which is a sign of a disease?
a) Headache
b) Back pain
c) Lab report showing infection
d) Tiredness
Answer: c
6. Acute diseases last for—
a) A lifetime
b) A few days or weeks
c) Many years
d) Whole life
Answer: b
7. Which of the following is a chronic disease?
a) Common cold
b) Headache
c) Asthma
d) Fever
Answer: c
8. Which of the following is an infectious disease?
a) Diabetes
b) Cancer
c) Tuberculosis
d) High blood pressure
Answer: c
9. Which of the following is non-infectious?
a) Cholera
b) Malaria
c) AIDS
d) Hypertension
Answer: d
10. Infectious diseases are caused by—
a) Genes
b) Microorganisms
c) Nutritional deficiency
d) Lifestyle
Answer: b
Class 9 Science Chapter 13 MCQ Question Answer SEBA 2026-27
11. Common cold is caused by—
a) Bacteria
b) Virus
c) Fungi
d) Protozoa
Answer: b
12. Cholera is caused by—
a) Virus
b) Worm
c) Bacteria
d) Fungus
Answer: c
13. Malaria is caused by—
a) Virus
b) Protozoa
c) Fungus
d) Bacteria
Answer: b
14. Elephantiasis is caused by—
a) Virus
b) Fungi
c) Worms
d) Protozoa
Answer: c
15. Antibiotics work only against—
a) Viruses
b) Fungi
c) Protozoa
d) Bacteria
Answer: d
16. Tuberculosis spreads through—
a) Water
b) Air
c) Food
d) Mosquito bite
Answer: b
17. Cholera spreads through—
a) Air
b) Contaminated water
c) Mosquito bite
d) Touching a sick person
Answer: b
18. Which disease spreads through sexual contact?
a) Dengue
b) AIDS
c) Cold
d) Cholera
Answer: b
19. Malaria is caused and spread by—
a) Virus in air
b) Bacteria in water
c) Mosquito vector
d) Sharing food
Answer: c
20. HIV does NOT spread through—
a) Sharing needles
b) Blood transfusion
c) Mother to baby
d) Handshake
Answer: d
Why Do We Fall Ill Class 9 SEBA MCQ Notes
21. Symptom relief includes—
a) Killing microbes
b) Reducing fever
c) Killing viruses
d) Giving vaccines
Answer: b
22. Antibiotics do NOT work on viruses because—
a) Viruses are very big
b) Viruses don’t have cell walls
c) Viruses live in water
d) Viruses are dead
Answer: b
23. Which medicine is used for malaria?
a) Antibiotic
b) Antiviral
c) Antiprotozoal
d) Antifungal
Answer: c
24. Public hygiene helps prevent—
a) Only cold
b) Only fever
c) Spread of many diseases
d) Only genetic diseases
Answer: c
25. Vaccination works by—
a) Directly killing microbes
b) Strengthening muscles
c) Training the immune system
d) Removing toxins from body
Answer: c
26. Which is a general method of prevention?
a) Vaccination
b) Using antibiotics
c) Keeping environment clean
d) Anti-viral medicines
Answer: c
27. Which vaccine prevents polio?
a) BCG
b) MMR
c) OPV
d) Hepatitis B
Answer: c
28. Poor nutrition leads to—
a) Strong immunity
b) Weak immunity
c) Fast growth
d) No effect
Answer: b
29. Which is a contributory cause of disease?
a) Infection
b) Poverty
c) Virus
d) Bacteria
Answer: b
30. A disease with more than one cause is called—
a) Rare
b) Single-cause disease
c) Multi-factorial disease
d) Mental disorder
Answer: c
SEBA Class 9 Science Chapter 13 Multiple Choice Questions
31. During a disaster like an earthquake or cyclone, which of the following health effects occurs immediately?
a) Spread of water-borne diseases
b) Mental trauma and stress
c) Injuries from falling buildings
d) Malnutrition
Answer: c) Injuries from falling buildings
32. Which health impact is likely to appear long after a natural disaster?
a) Broken bones and injuries
b) Lack of shelter during the disaster
c) Spread of diarrhoea due to contaminated water
d) People trapped under debris
Answer: c) Spread of diarrhoea due to contaminated water
33. Why do some health effects of disasters appear later?
a) Because people don’t get injured during disasters
b) Because long-term conditions arise from poor living conditions after the disaster
c) Because doctors arrive quickly
d) Because disasters never affect health
Answer: b) Because long-term conditions arise from poor living conditions after the disaster
34. What is the most important provision by local authorities for preventing water-borne diseases?
a) Providing free medicines
b) Providing clean drinking water
c) Closing schools
d) Increasing electricity supply
Answer: b) Providing clean drinking water
35. Solid waste management by a municipal corporation means:
a) Cutting trees
b) Collecting and disposing of garbage properly
c) Increasing traffic
d) Stopping water supply
Answer: b) Collecting and disposing of garbage properly
36. Which of the following will help reduce solid waste at home?
a) Using disposable items
b) Burning all garbage
c) Segregating waste and recycling
d) Throwing all waste in one bin
Answer: c) Segregating waste and recycling
37. Acute diseases usually last:
a) A few days or weeks
b) Many months
c) Several years
d) A lifetime
Answer: a) A few days or weeks
38. Chronic diseases usually:
a) Start suddenly and end quickly
b) Last for a long time
c) Never affect daily life
d) Are not harmful
Answer: b) Last for a long time
39. Why is the number of chronic disease patients usually higher in a neighbourhood?
a) Because chronic diseases last longer
b) Because people get sick only once
c) Because acute diseases never occur
d) Because chronic diseases spread quickly
Answer: a) Because chronic diseases last longer
40. If many students have cold and cough, which of the following is TRUE?
a) Everyone will have the same symptoms
b) The illness usually lasts a few days
c) No one spreads it to others
d) Antibiotics cure all colds
Answer: b) The illness usually lasts a few days
Class 9 Science Chapter 13 Objective Questions
41. Antibiotics are useful for:
a) Viral infections
b) Common cold
c) Bacterial infections
d) All diseases
Answer: c) Bacterial infections
42. Why might students who took antibiotics not recover faster from a cold?
a) Because antibiotics work slowly
b) Because colds are caused by viruses
c) Because antibiotics are too strong
d) Because antibiotics cause fever
Answer: b) Because colds are caused by viruses
43. Children from poorer families may be shorter than children from well-off families mainly because:
a) They are lazy
b) They eat more junk food
c) They may lack proper nutrition
d) They sleep more
Answer: c) They may lack proper nutrition
44. If there is no height difference between children of rich and poor families, it shows:
a) Money does not affect health at all
b) Both groups get proper nutrition
c) Poor families are always healthier
d) Children do not need good food
Answer: b) Both groups get proper nutrition
45. Rabies is spread through the bite of:
a) Mosquito
b) Infected dog or animal
c) Housefly
d) Rat
Answer: b) Infected dog or animal
46. A major method to control rabies in a community is:
a) Giving polio drops
b) Vaccinating dogs and humans
c) Cleaning roads
d) Spraying insecticides
Answer: b) Vaccinating dogs and humans
47. Which of the following is a sign that rabies control measures are not adequate?
a) Increase in stray dog population
b) Clean drinking water supply
c) Fewer dog bite cases
d) More vaccination centres
Answer: a) Increase in stray dog population
SEBA Class 9 Science Chapter 13 MCQ Solutions
🔬 Updated MCQ Guide Notice: This page features a full collection of SEBA Class 9 Science Chapter 13 (Why Do We Fall Ill) Multiple Choice Questions (MCQs) with accurate options and step-by-step explanations, fully updated for the 2026–27 academic session in accordance with the latest revised Assam Board (SEBA) textbook.
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