The following 20 Multiple Choice Questions (MCQ) are based on
Chapter 3: Health: The Ultimate Treasure from the NCERT Class 8
Science textbook Curiosity. Each question has four options - select the
best answer and click to check.
Instructions: Read each question carefully. Choose the most
appropriate option from (a), (b), (c), or (d). Click
Show Answer to reveal the correct answer with explanation.
Multiple Choice Questions
1Health is best described as:
(a) Only absence of fever
(b) Physical, mental and social well-being
(c) Ability to work without sleep
(d) Taking medicine daily
(b) is correct
Being healthy includes the body, mind and social life, not merely absence of disease.
2Which habit supports good health?
(a) Constant screen use
(b) Skipping meals
(c) Using tobacco
(d) Balanced diet, exercise and adequate sleep
(d) is correct
Nutrition, activity, rest and healthy routines support normal body and mental function.
3Why is clean drinking water important?
(a) It replaces vaccination
(b) It kills every pathogen instantly
(c) It prevents all non-communicable diseases
(d) It reduces water-borne infections
(d) is correct
Safe water interrupts transmission of pathogens that spread through contaminated water.
4A sign of disease differs from a symptom because a sign is:
(a) Only an emotion
(b) Always imagined
(c) Observable or measurable by others
(d) Never useful to doctors
(c) is correct
Signs such as fever can be measured, while symptoms such as pain are experienced by the patient.
5Communicable diseases are diseases that:
(a) Can spread through infectious agents
(b) Never pass between hosts
(c) Are caused only by lifestyle
(d) Occur only in old age
(a) is correct
Pathogens can move directly or indirectly from an infected source to another host.
6Which is a non-communicable disease?
(a) Tuberculosis
(b) Diabetes
(c) Chickenpox
(d) Cholera
(b) is correct
Diabetes does not spread from one person to another.
7Disease-causing microorganisms are called:
(a) Antibodies
(b) Vaccines
(c) Nutrients
(d) Pathogens
(d) is correct
Pathogens include disease-causing bacteria, viruses, fungi, protozoa and other agents.
8Which disease is commonly spread by contaminated water?
(a) Scurvy
(b) Cholera
(c) Diabetes
(d) Hypertension
(b) is correct
Cholera bacteria can spread through water contaminated with infected faecal matter.
9Dengue is transmitted mainly by:
(a) Aedes mosquitoes
(b) Houseflies
(c) Earthworms
(d) Honeybees
(a) is correct
Infected Aedes mosquitoes carry the dengue virus between people.
10Removing stagnant water helps prevent dengue because it:
(a) Cures infected people
(b) Kills all bacteria in food
(c) Replaces vaccines
(d) Eliminates mosquito breeding sites
(d) is correct
Aedes mosquitoes breed in collected water, so source reduction lowers their numbers.
11Which measure reduces the spread of respiratory infections?
(a) Avoiding handwashing
(b) Taking antibiotics without advice
(c) Covering coughs and improving ventilation
(d) Sharing used tissues
(c) is correct
Respiratory hygiene and ventilation reduce exposure to infectious droplets and aerosols.
12The body's ability to resist infection is called:
(a) Buoyancy
(b) Immunity
(c) Pressure
(d) Fermentation
(b) is correct
Immune defences recognise and respond to pathogens.
13How does a vaccine protect a person?
(a) By training immune memory without causing the full disease
(b) By killing every microbe outside the body
(c) By replacing nutritious food
(d) By curing all existing diseases immediately
(a) is correct
Vaccination prepares a faster and stronger response when the real pathogen is encountered.
14Why is the immune response often stronger on second exposure to the same pathogen?
(a) The pathogen has no genetic material
(b) The body stops making antibodies
(c) Temperature always rises
(d) The body has memory cells
(d) is correct
Memory cells formed after the first exposure respond rapidly on later exposure.
15Antibiotics are primarily used against:
(a) Nutritional deficiencies
(b) Injuries without infection
(c) Bacterial infections
(d) All viral infections
(c) is correct
Antibiotics target bacterial structures or processes and do not cure viral colds or flu.
16Why should antibiotics not be used unnecessarily?
(a) They make vaccines ineffective instantly
(b) Misuse can promote antibiotic-resistant bacteria
(c) They always cause viral infection
(d) They are nutrients
(b) is correct
Unnecessary or incomplete use selects bacteria that survive the medicine.
17Which factor increases risk of non-communicable diseases?
(a) Regular exercise
(b) Tobacco use and unhealthy diet
(c) Clean surroundings
(d) Adequate sleep
(b) is correct
Harmful substances, inactivity and poor diet contribute to heart disease, diabetes and some cancers.
18Which statement about mental health is correct?
(a) Stress and emotions can affect overall well-being
(b) Only physical symptoms matter
(c) Sleep has no effect
(d) It is unrelated to health
(a) is correct
Mental and physical health interact, so emotional well-being is an important part of health.
19Treatment of an infectious disease may include:
(a) Stopping food and water
(b) Ignoring medical advice
(c) Appropriate medicine plus rest, fluids and nutrition
(d) Any antibiotic for every illness
(c) is correct
Treatment depends on the cause, while supportive care helps recovery.
20Community vaccination protects vulnerable people partly by:
(a) Causing every person to become ill
(b) Reducing circulation of the pathogen
(c) Increasing mosquito breeding
(d) Creating contaminated water
(b) is correct
When many people are immune, transmission is less likely to reach those who remain susceptible.
