Science for Class 8 ( Science Curiosity ) Worksheet

Q1. Multiple Choice Questions (MCQs)

Instruction: Select the correct option for each question.

1. According to WHO, health means:
   a) Only absence of disease
   b) Physical fitness only
   c) Complete physical, mental, and social well-being
   d) Ability to work hard
2. Which is a sign, not a symptom?
   a) Pain
   b) Tiredness
   c) Dizziness
   d) Fever
3. Which disease is non-communicable?
   a) Typhoid
   b) Dengue
   c) Diabetes
   d) Chickenpox
4. Which habit helps prevent communicable diseases?
   a) Skipping breakfast
   b) Sharing towels
   c) Washing hands with soap
   d) Sleeping very late
5. Which statement about antibiotics is correct?
   a) They kill viruses like flu
   b) They treat protozoan diseases
   c) They kill bacteria
   d) They are safe to take without prescription
6. Who discovered the first antibiotic, penicillin?
   a) Edward Jenner
   b) Alexander Fleming
   c) Robert Koch
   d) Louis Pasteur
7. Vaccines protect by:
   a) Killing pathogens directly in the body
   b) Teaching the immune system to recognize germs
   c) Giving energy to white blood cells
   d) Replacing antibiotics
8. Which factor commonly increases risk of NCDs?
   a) Playing outdoors
   b) Balanced diet
   c) Longer lifespans and less physical activity
   d) Handwashing
9. Which practice from Ayurveda supports holistic health?
   a) Variolation
   b) Dinacharya and ritucharya
   c) Overuse of antibiotics
   d) Skipping meals
10. AQI is used to measure:
    a) Water purity
    b) Body temperature
    c) Air quality
    d) Sleep quality

Q2. Fill in the Blanks

Instruction: Fill in the blanks with the correct word based on the chapter.

1. Health includes physical, mental, and ______ well-being.
2. Headache is a ______ experienced by the patient.
3. A measurable change like a rash or swelling is called a ______.
4. Diseases that spread from person to person are called ______ diseases.
5. Diseases like cancer and asthma that do not spread are ______ diseases.
6. The body’s ability to fight diseases is called ______.
7. Using weakened or inactive germs to train the body’s defense is called a ______.
8. Taking antibiotics without need can lead to antibiotic ______.
9. Building and using toilets helps prevent diseases spread through contaminated ______.
10. Practising ______, like deep breathing, supports mental health in Ayurveda.

Q3. Very Short Answer Questions 

Instruction: Answer the following questions in one line.

1. What does WHO say about health?
2. Name one vector that spreads communicable diseases.
3. What is the term for the body’s natural defense system?
4. Which discovery led to modern antibiotics?
5. What does AQI stand for?

Q4. Short Answer Questions 

Instruction: Answer the following questions in 2–3 lines.

1. How did screen time and loneliness affect student’s health?
2. How do communicable diseases spread through air?
3. Why should we finish a full course of antibiotics?
4. How does community sanitation improve health?
5. Why are relationships important for health?

Q5. Match the Following

Instruction: Match Column A with the correct option in Column B.

Check the worksheet solutions here.

Multiple Choice Questions (MCQs)

Instruction: Select the correct option for each question.

1. Who first used the term “cell” after observing thin slices of cork?
   a) Antonie van Leeuwenhoek
   b) Robert Hooke
   c) Louis Pasteur
   d) Ananda Mohan Chakrabarty
2. Which tool allows us to view objects too small to be seen with the naked eye?
   a) Telescope
   b) Periscope
   c) Microscope
   d) Binoculars
3. A round-bottom flask filled with water can act as:
   a) A lens/magnifier
   b) A telescope
   c) A prism
   d) A mirror
4. Which cell structure is present in plant cells but absent in animal cells?
   a) Nucleus
   b) Cell membrane
   c) Cell wall
   d) Cytoplasm
5. Which statement is true about cheek cells?
   a) They are rectangular and have a cell wall.
   b) They have a large central vacuole. 
   c) They contain chloroplasts.
   d) They are polygon-shaped and lack a cell wall.
6. Which part of the cell controls all activities like growth and division?
   a) Cytoplasm
   b) Nucleus
   c) Cell membrane
   d) Vacuole
7. Spirulina is best described as:
   a) A microalga used as a superfood
   b) A nitrogen-fixing bacterium
   c) A fungus used in bread making
   d) A protozoan that causes disease
8. Which microorganism helps convert milk into curd?
   a) Yeast
   b) Rhizobium
   c) Lactobacillus
   d) Amoeba

Milk to Curd

Fill in the BlanksInstruction: Fill in the blanks with the correct word based on the chapter.

1. The jelly-like substance inside a cell where life processes occur is the ______.
2. The thin, flexible boundary of a cell that controls entry and exit is the ______ ______.
3. In onion peel cells, staining with ______ helps make the cells visible.
4. Cheek cells are commonly stained with ______ ______.
   
   Cheek Cells
5. The bacteria that fix nitrogen in legume root nodules are called ______.
6. The process by which yeast makes dough rise by releasing carbon dioxide is called ______.
7. Bacterial genetic material without a nuclear membrane is found in a region called the ______.

Very Short Answer Questions 

Instruction: Answer the following questions in one line.

1. Who is known as the Father of Microbiology?
2. What do chloroplasts contain that enables photosynthesis?
3. Name the large storage cavity commonly found in plant cells.
4. What shape are muscle cells typically described as?
5. Which organisms decompose waste to form manure?

Short Answer QuestionsInstruction: Answer the following questions in 2–3 lines.

1. Why are some microorganisms invisible to the naked eye?
2. How does high salt or sugar preserve pickles and murabbas?
3. How do nerve cells (neurons) suit their function?
   
4. Why is warm milk preferred for curd formation?
5. What role do microalgae play in Earth’s oxygen supply?

Match the Following 

Instruction: Match Column A with the correct option in Column B.

Check worksheet solutions here.

Multiple Choice Questions (MCQs)

Instruction: Select the correct option for each question.

1. According to this chapter, what starts every good scientific investigation?
   a) Expensive lab equipment
   b) Memorising facts
   c) Asking focused “Why?” and “How?” questions
   d) Copying others’ experiments
2. What does “controlling variables” mean in an experiment like puffing a puri?
   a) Changing many things at once
   b) Changing nothing at all
   c) Changing only one factor while keeping others the same
   d) Ignoring measurements
3. In the “roots and kites” symbol, roots mainly remind us to:
   a) Fly kites higher
   b) Rely only on imagination
   c) Stay grounded in careful observations and facts
   d) Ignore data
   Roots and Kites
4. Which topic best illustrates “the invisible world”?
   a) Moon phases
   b) Microbes in a drop of water
   c) Cyclones
   d) Mirrors and lenses
5. Which is NOT a correct match of topic to key idea?
   a) Health — immunity and vaccines help prevent disease
   b) Electricity — only lighting bulbs, not heating
   c) Forces — change speed/direction of objects
   d) Pressure and winds — air moves from high to low pressure
6. What is the main reason for doing “one change at a time” in an experiment?
   a) To finish faster
   b) To make it more exciting
   c) To clearly link cause and effect
   d) To avoid writing observations
7. Which tool of science is most directly used when you record time to puff a puri?
   a) Classifying
   b) Measuring
   c) Predicting without testing
   d) Guessing
8. Why do we learn about Moon phases and eclipses under “keeping time with the skies”?
   a) For decoration
   b) To ignore calendars
   c) Because celestial motions helped humans define days, months, years
   d) To stop using watches

Fill in the Blanks

Instruction: Fill in the blanks with the correct word based on the chapter.

1. Writing down what you see is called __________.
2. Health is complete physical, mental, and __________ well-being.
3. Air moves from high pressure to __________ pressure to form winds.
4. All matter is made of tiny __________ that behave differently in solids, liquids, and gases.
5. Light can __________ from mirrors and __________ through lenses.
6. Watching the Sun and Moon helped humans create __________ to track days and months.
7. Science balances careful observation with __________ thinking.

Very Short Answer Questions

Instruction: Answer the following questions in one line.

1. What two words best start a scientific investigation?
2. In an experiment, what do we call the factor we deliberately change?
3. Name one measurement you could take in the puri experiment.
4. Give one reason to keep a science notebook.

Short Answer Questions

Instruction: Answer the following questions in 2–3 lines.

1. Why is changing only one variable at a time important?
2. How does this chapter connect small observations to big ideas?
3. What skills are highlighted as core to doing science well?
4. Give two example variables for the puri activity.

Poori puffing up in Oil

Match the Following

Instruction: Match Column A with the correct option in Column B.

Check the solutions of worksheet here.