CBSE Class 8 Science Chapter 03 Health The Ultimate Treasure MCQs Set 01

Download CBSE MCQs for Class 8 Science: Chapter 03 Health The Ultimate Treasure

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Chapter-wise Objective Questions: Chapter 03 Health The Ultimate Treasure

View or download the dedicated Chapter 03 Health The Ultimate Treasure MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Science evaluations.

Question: According to the WHO definition referenced in the chapter, what three aspects together make up complete health?
A. physical, mental, and emotional well-being
B. physical, mental, and social well-being
C. physical, psychological, and community well-being
D. mental, social, and environmental well-being
Show Answer & Explanation

Answer: (B) physical, mental, and social well-being

Explanation:
The chapter explicitly states the WHO definition of health as 'a state of complete physical, mental, and social well-being, and not merely the absence of disease.' This is highlighted in section 3.1 when discussing what true health means beyond just the absence of illness.

Question: In the story of the Grade 8 student who moved to a new city, what was the primary factor that initially caused his health problems?
A. poor diet and lack of exercise
B. spending excessive time on screens
C. loneliness and lack of friends in his new environment
D. not getting enough sleep due to anxiety
Show Answer & Explanation

Answer: (C) loneliness and lack of friends in his new environment

Explanation:
The activity describes how the student felt lonely with no friends and busy parents, which led him to spend more time on social media trying to cope. The loneliness and isolation were the root causes; excessive screen time was his attempted coping mechanism that worsened the situation.

Question: What does Ayurveda teach about maintaining true health?
A. only through modern medical treatments
B. through a balance of body, mind, and surroundings, including following daily and seasonal routines
C. primarily through physical exercise and diet alone
D. by avoiding all traditional practices and using only scientific medicine
Show Answer & Explanation

Answer: (B) through a balance of body, mind, and surroundings, including following daily and seasonal routines

Explanation:
• The chapter's 'Our scientific heritage' section explains that Ayurveda teaches health is a balance of body, mind, and surroundings
• Following dinacharya (daily routine) and ritucharya (seasonal routine) helps maintain this balance
• Eating fresh wholesome food suited to one's prakriti (body constitution) is essential

Question: Which of the following is an example of a non-communicable disease mentioned in the chapter?
A. typhoid
B. measles
C. chickenpox
D. diabetes
Show Answer & Explanation

Answer: (D) diabetes

Explanation:
Diabetes is explicitly listed as a non-communicable disease in section 3.4. The chapter notes that diabetes, along with cancer and asthma, are not caused by pathogens and do not spread from person to person; they are usually linked to lifestyle, diet, and environment.

Question: What is the key difference between a symptom and a sign as explained in the chapter?
A. symptoms last longer than signs
B. a symptom is what we feel while a sign is what can be seen or measured
C. signs are internal and symptoms are external
D. they are the same thing with different names
Show Answer & Explanation

Answer: (B) a symptom is what we feel while a sign is what can be seen or measured

Explanation:
Section 3.3 clearly distinguishes these terms: a symptom is what we feel (like pain), while a sign is something that can be seen or measured (like high body temperature or a rash). This distinction helps doctors understand what might be causing illness.

Question: How do pathogens typically spread from one person to another according to the chapter?
A. only through contaminated food and water
B. through air when infected persons cough or sneeze, direct contact, indirect contact, contaminated food or water, and through insect vectors
C. exclusively through sharing personal items
D. only by direct physical contact
Show Answer & Explanation

Answer: (B) through air when infected persons cough or sneeze, direct contact, indirect contact, contaminated food or water, and through insect vectors

Explanation:
Section 3.4.1 lists multiple transmission routes: airborne transmission through coughs and sneezes, direct contact like handshaking, indirect contact through shared items, contaminated food and water, and insect vectors like mosquitoes. The figure illustrates all these different pathways.

Question: What role do vaccines play in protecting the body from disease?
A. they cure diseases that are already present
B. they train the immune system to recognize and attack harmful germs by providing acquired immunity
C. they replace the natural immune system entirely
D. they prevent all types of infections without exception
Show Answer & Explanation

Answer: (B) they train the immune system to recognize and attack harmful germs by providing acquired immunity

Explanation:
The chapter explains that vaccines help the body fight certain diseases by training the immune system to recognize and attack harmful germs, providing acquired immunity—protection developed after exposure to a pathogen or vaccine. They work with the immune system, not replacing it.

Question: Based on Edward Jenner's discovery with cowpox, what principle did he establish that led to the first vaccine?
A. that all viral diseases were incurable
B. that exposure to a milder related disease could provide protection against a more serious disease
C. that vaccination should only be attempted on animals
D. that smallpox and cowpox were completely unrelated diseases
Show Answer & Explanation

Answer: (B) that exposure to a milder related disease could provide protection against a more serious disease

Explanation:
Jenner observed that milkmaids who had cowpox did not catch smallpox, and he hypothesized that the content in cowpox blisters protected against smallpox. He tested this by injecting cowpox material into a boy, who showed no illness when later exposed to smallpox. This led to the development of the first vaccine.

Question: Why are antibiotics ineffective against viral infections like the common cold?
A. viruses are too small to be affected by any medicine
B. antibiotics specifically target parts of bacterial cells that differ from human cells; viruses have completely different structures
C. antibiotics work too slowly for viral infections
D. the chapter does not provide information about this distinction
Show Answer & Explanation

Answer: (B) antibiotics specifically target parts of bacterial cells that differ from human cells; viruses have completely different structures

Explanation:
Section 3.5.1 states that antibiotics work only against bacterial infections because they target parts of bacterial cells that are different from human or other animal cells. Viruses have entirely different structures and mechanisms, so antibiotics cannot work against them.

Question: What is antibiotic resistance and why has it become a problem?
A. it is a temporary weakness in the immune system
B. it is when bacteria that were earlier killed by antibiotics survive and multiply despite treatment, making infections harder to treat and increasing risks of complications and death
C. it is a new type of bacteria that has never existed before
D. it only affects elderly people and has no impact on younger populations
Show Answer & Explanation

Answer: (B) it is when bacteria that were earlier killed by antibiotics survive and multiply despite treatment, making infections harder to treat and increasing risks of complications and death

Explanation:
Section 3.5.1 defines antibiotic resistance as a phenomenon where bacteria survive and multiply despite antibiotic treatment. The chapter explains this occurs due to indiscriminate use of antibiotics and makes infections harder to treat, increasing the risk of complications, prolonged illness, and even death.

Question: In the Odisha sanitation campaign mentioned in the chapter, what was the primary health benefit achieved?
A. increased vaccination rates in the community
B. reduced cases of diarrhoea and infections through improved sanitation and increased toilet use
C. improved access to antibiotics
D. increased awareness about air pollution
Show Answer & Explanation

Answer: (B) reduced cases of diarrhoea and infections through improved sanitation and increased toilet use

Explanation:
Activity 3.6 describes how the community sanitation campaign in Bhadrak district helped more people build and use toilets, which significantly reduced open defecation and improved child health with fewer cases of diarrhoea and infections. This demonstrates that simple steps like good sanitation can greatly reduce communicable diseases.

Question: What does immunity refer to in the context of disease prevention?
A. complete absence of any pathogens in the environment
B. the natural ability of our body to fight diseases through the immune system
C. a state where a person never gets sick under any circumstances
D. only the protection provided by vaccines and nothing else
Show Answer & Explanation

Answer: (B) the natural ability of our body to fight diseases through the immune system

Explanation:
The chapter defines immunity as the natural ability of our body to fight diseases. Our body has a special system called the immune system that helps fight against diseases. This is the foundation upon which vaccination works by enhancing this natural ability.

Question: What can be inferred about the relationship between lifestyle and non-communicable diseases from the chapter?
A. lifestyle has no effect on non-communicable diseases
B. lifestyle factors like unhealthy eating habits, lack of physical activity, and being overweight contribute to the development of non-communicable diseases like diabetes
C. all non-communicable diseases are purely genetic
D. lifestyle only affects communicable diseases
Show Answer & Explanation

Answer: (B) lifestyle factors like unhealthy eating habits, lack of physical activity, and being overweight contribute to the development of non-communicable diseases like diabetes

Explanation:
Section 3.4.2 explains that non-communicable diseases like diabetes develop due to a combination of hormonal imbalances, unhealthy eating habits, lack of physical activity, being overweight or obese, and other reasons. The chapter emphasizes that understanding causes helps in prevention through healthy lifestyle choices.

Question: What is the significance of the Air Quality Index (AQI) mentioned in the chapter?
A. it measures the nutritional value of food
B. it helps us know how clean the air is and indicates potential respiratory health problems
C. it is only relevant for industrial workers
D. it measures the water quality in cities
Show Answer & Explanation

Answer: (B) it helps us know how clean the air is and indicates potential respiratory health problems

Explanation:
Section 3.2.2 mentions that clean air and water are important for our health, and in cities, air pollution from vehicles and factories can cause problems like coughing or asthma. The Air Quality Index (AQI) helps us know how clean the air is, making it a practical tool for understanding environmental health risks.

Question: According to the chapter, how should antibiotics be used to help prevent antibiotic resistance?
A. take them whenever you feel slightly ill
B. use only when prescribed by a doctor, in the correct dose, and for the right duration
C. stop taking them as soon as you feel better
D. share antibiotics with family members who have similar symptoms
Show Answer & Explanation

Answer: (B) use only when prescribed by a doctor, in the correct dose, and for the right duration

Explanation:
Activity 3.7 emphasizes that to tackle antibiotic resistance, we must use antibiotics wisely—only when prescribed by a doctor, in the correct dose, and for the right duration. Avoiding unnecessary use helps prevent the rise of resistant bacteria and keeps antibiotics effective for future generations.

Question: Which of the following statements best reflects the understanding that health involves more than just the absence of disease?
A. Health is achieved only when a person has no fever or visible symptoms.
B. A person can be physically disease-free yet still feel unwell due to loneliness or poor relationships.
C. Health depends entirely on the quality of medical treatment available in hospitals.
D. Non-communicable diseases are the only factor that affects overall well-being.
Show Answer & Explanation

Answer: (B) A person can be physically disease-free yet still feel unwell due to loneliness or poor relationships.

Explanation:
The chapter emphasizes through the Grade 8 student example that health includes physical, mental, and social dimensions. Even without disease, loneliness and lack of social connection caused the student significant health problems.

Question: According to the chapter, deficiency diseases like scurvy and goitre are classified as non-communicable because they result from what primary cause?
A. Infection by specific pathogens such as bacteria or viruses.
B. Lack of particular nutrients in the diet over time.
C. Direct transmission from infected individuals to healthy ones.
D. Exposure to environmental pollutants like air or water contamination.
Show Answer & Explanation

Answer: (B) Lack of particular nutrients in the diet over time.

Explanation:
The chapter states that scurvy, anaemia, and goitre are caused by a lack of specific nutrients in the diet and are classified as deficiency diseases—a type of non-communicable disease.

Question: In the context of disease transmission shown in the chapter's diagram, insects such as mosquitoes and houseflies are referred to by which term?
A. Pathogens
B. Vectors
C. Hosts
D. Antibodies
Show Answer & Explanation

Answer: (B) Vectors

Explanation:
The chapter specifically identifies mosquitoes and houseflies as vectors—organisms that spread disease-causing pathogens from one person to another.

Question: What does the chapter suggest about why some people fall sick more frequently than others despite living in similar environments?
A. Genetic factors alone determine susceptibility to all diseases.
B. The body's natural ability to fight disease, known as immunity, varies among individuals.
C. Non-communicable diseases affect everyone equally regardless of lifestyle.
D. Environmental cleanliness is completely unrelated to personal immunity.
Show Answer & Explanation

Answer: (B) The body's natural ability to fight disease, known as immunity, varies among individuals.

Explanation:
The chapter explains that immunity—the body's natural ability to fight diseases—differs from person to person, which is why some individuals get sick more often than others in the same surroundings.

Question: When Edward Jenner tested his cowpox hypothesis by injecting cowpox sap into a boy, what outcome did he observe that led to the first vaccine?
A. The boy developed severe symptoms and required immediate medical treatment.
B. The boy later showed no illness when exposed to smallpox, confirming his hypothesis.
C. The boy became immune to cowpox but remained vulnerable to smallpox.
D. The experiment had to be repeated many times before any results were seen.
Show Answer & Explanation

Answer: (B) The boy later showed no illness when exposed to smallpox, confirming his hypothesis.

Explanation:
• Jenner's experimentation involved injecting cowpox sap into a boy
• When later exposed to smallpox, the boy showed no illness
• This result confirmed his hypothesis and led to the development of the first vaccine

Question: The chapter describes how bacteria can develop antibiotic resistance. Which of the following sequences correctly reflects how this resistance spreads?
A. Resistant bacteria multiply, are killed by antibiotics, and eventually disappear from the body.
B. Some bacteria survive antibiotic treatment, multiply, and transfer resistance genes to other bacteria.
C. All bacteria are naturally resistant to antibiotics from birth and cannot be treated.
D. Antibiotic resistance only occurs in hospitalized patients and never spreads to the community.
Show Answer & Explanation

Answer: (B) Some bacteria survive antibiotic treatment, multiply, and transfer resistance genes to other bacteria.

Explanation:
The chapter illustrates that resistant bacteria survive treatment, grow in number, and critically, transfer their resistance to other bacteria, making the problem worse and harder to manage over time.

Question: Based on the information about India's vaccine production mentioned in the chapter, what global health role does India play?
A. India manufactures vaccines only for domestic use and does not export them.
B. India is one of the world's largest vaccine producers and supplies vaccines to many countries.
C. India relies entirely on other countries for its vaccine supply.
D. Indian vaccine companies only produce vaccines for non-communicable diseases.
Show Answer & Explanation

Answer: (B) India is one of the world's largest vaccine producers and supplies vaccines to many countries.

Explanation:
The chapter's 'Ever heard of' section states that India is one of the world's largest vaccine producers and manufactures vaccines on a massive scale, supplying them to many countries and playing a key role during the COVID-19 pandemic.

Question: What does the chapter reveal about the traditional Indian practice of variolation in relation to modern vaccination?
A. Variolation was entirely ineffective and played no role in disease prevention history.
B. Long before modern vaccines, Indians used variolation to build immunity against smallpox by controlled exposure to infection.
C. Variolation was invented after Edward Jenner's work on the smallpox vaccine.
D. Variolation only worked for diseases other than smallpox and proved harmful overall.
Show Answer & Explanation

Answer: (B) Long before modern vaccines, Indians used variolation to build immunity against smallpox by controlled exposure to infection.

Explanation:
The 'Our scientific heritage' section explains that variolation involved using smallpox sore material to create a mild infection and build immunity, demonstrating that India had indigenous immunization methods before modern vaccination science.

Question: According to the chapter, why are vaccines considered preventive rather than curative in nature?
A. Vaccines can treat any disease once someone has already fallen ill.
B. Vaccines help minimize serious diseases before they occur but cannot treat active infections.
C. Vaccines work equally well for treating both bacterial and viral infections.
D. Once vaccinated, a person never needs medical care for any illness.
Show Answer & Explanation

Answer: (B) Vaccines help minimize serious diseases before they occur but cannot treat active infections.

Explanation:
The chapter clearly states that vaccines are preventive, not curative—they protect people from becoming ill in the first place but do not treat disease in someone who is already sick.

Question: The chapter emphasizes the importance of lifestyle changes in managing non-communicable diseases. How do these changes differ from treatment of communicable diseases?
A. Non-communicable diseases require only vaccination and no other intervention.
B. Non-communicable disease therapy focuses on managing symptoms and improving quality of life, while communicable disease treatment targets eliminating the pathogen.
C. Both disease types are treated identically with the same medications regardless of cause.
D. Non-communicable diseases cannot be managed or prevented through any means.
Show Answer & Explanation

Answer: (B) Non-communicable disease therapy focuses on managing symptoms and improving quality of life, while communicable disease treatment targets eliminating the pathogen.

Explanation:
• Non-communicable diseases: therapy focuses on managing symptoms, lifestyle changes, and rehabilitation; requires early diagnosis and continuous care
• Communicable diseases: treatment aims to eliminate the pathogen using medicines like antibiotics
• The approaches differ fundamentally because NCDs are lifestyle-linked while communicable diseases are pathogen-caused

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Practice MCQs for Class 8 Science Chapter 03 Health The Ultimate Treasure

Class 8 Science Chapter 03 Health The Ultimate Treasure Objective Test Questions

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