Health: The Ultimate Treasure MCQs (Class 8 Science, NCERT)

105 practice questions on Health: The Ultimate Treasure, a chapter in the NCERT Class 8 Science textbook. Every question includes a written explanation. Try the samples below - the answer stays hidden until you ask for it.

Sample questions

Q1
easy
Using a toilet and washing the hands afterwards mainly prevents
  1. A diseases spread by mosquito bites, such as malaria and dengue in the rainy season
  2. B goitre
  3. C night blindness
  4. D diseases that spread through food and water, such as cholera and typhoid
Show answer and explanation

Correct answer: D - diseases that spread through food and water, such as cholera and typhoid

Sanitation and hand washing keep sewage microorganisms out of food and water, which is exactly how cholera and typhoid spread. Goitre and night blindness follow nutrient shortages, and mosquito-borne diseases need mosquito control instead.
Q2
medium
A man eats fried food every day, never exercises and is overweight. He develops a heart problem. This illness is
  1. A a deficiency disease caused by a lack of iodine
  2. B caused by a virus present in his food
  3. C non-infectious, and linked to his diet and lack of activity
  4. D infectious, caught from a family member
Show answer and explanation

Correct answer: C - non-infectious, and linked to his diet and lack of activity

Heart disease of this kind builds up over years from diet, weight and inactivity, and it does not pass between people. Nothing here suggests an infection or a virus, and a shortage of iodine causes goitre rather than heart disease.
Q3
medium
Which disease is spread by an insect that carries the microorganism from one person to another?
  1. A Malaria
  2. B Scurvy
  3. C Diabetes
  4. D Rickets
Show answer and explanation

Correct answer: A - Malaria

Malaria is carried from person to person by the female Anopheles mosquito, which passes on the protozoan when it bites. Scurvy and rickets are deficiency diseases and diabetes is non-infectious, so none of them is spread by insects.
Q4
medium
Which routine gives the best pattern of activity for a Class 8 student?
  1. A Lifting the heaviest possible weight once a week
  2. B Sitting quietly for an hour every day
  3. C One very long run once a month
  4. D About an hour of active play, games or cycling on most days
Show answer and explanation

Correct answer: D - About an hour of active play, games or cycling on most days

Moderate activity on most days builds fitness steadily and is what health advice for students recommends. A single long run once a month leaves the body unfit in between, quiet sitting is not activity at all, and very heavy lifting can injure a growing body.
Q5
hard
During an outbreak of a disease that spreads through contaminated water, four suggestions are made. Which one would actually reduce the number of new cases?
  1. A Spray the streets with insecticide every morning
  2. B Chlorinate the community water supply and repair the leaking pipes
  3. C Ask everyone to sleep with the windows shut
  4. D Advise people to keep drinking water in open pots so that it stays cool
Show answer and explanation

Correct answer: B - Chlorinate the community water supply and repair the leaking pipes

A waterborne disease is stopped by treating the water and sealing the pipes through which sewage leaks in. Shut windows do not affect water, insecticide targets insects rather than waterborne bacteria, and open pots let dust, insects and dipped hands contaminate the water further.
Q6
hard
Assertion (A): Water that looks clear and has no smell is always safe to drink. Reason (R): Many microorganisms that cause disease are far too small to be seen with the naked eye.
  1. A Both A and R are true, and R is the correct explanation of A
  2. B Both A and R are true, but R is not the correct explanation of A
  3. C A is true, but R is false
  4. D A is false, but R is true
Show answer and explanation

Correct answer: D - A is false, but R is true

A is false, because clear-looking water can still carry disease-causing microorganisms. R is true, and it is exactly why appearance is no guide to safety. So the assertion fails while the reason stands.

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