What does 'Investigation in science' mean?

Studying something deeply and asking questions

What does the 'root' symbol in the book represent?

Strong foundation and tradition

When do we get the best results in science?

Through a balance of observation and imagination

What does the combination of 'root' and 'kite' teach us?

Science needs both foundation and exploration

What do some microorganisms do for us?

Help in digestion and medicine production

How can we stay healthy?

By nutritious food, exercise, and vaccines

What does 'pressure' indicate?

Distribution of force over an area

Chemical combination of two or more elements

How are moon phases formed?

Due to positions of Earth, Sun, and Moon

How were calendars created?

Through ancient human observations

Why is life possible on Earth?

Because of right distance from Sun and atmosphere

What is the purpose of the question ‘Why is one side of a puri thinner?’

To encourage scientific curiosity

What can be changed in the puri experiment?

Thickness of dough and temperature

Why is observation important in experiments?

Because it helps understand results

Why does a puri puff up?

Due to expansion of gas and steam

What does ‘Curiosity’ teach?

To understand and apply science

NCERT Solutions Class 8 Science - Curiosity Chapter 1 – Exploring the Investigative World of Science

Name: Exploring the Investigative World of Science – Class 8 Science - Curiosity
Uploaded: 2026-05-31
Description: In Grade 8, we step into the Investigative World of Science— where curiosity meets experiment. From microbes to the Moon, and from forces to ecosystems, we explore how observation, questioning, and experimentation help us understand our world and protect our planet.

Class 8 Science - Curiosity

Last Updated: 31 May 2026

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Chapter Introduction

In Grade 8, we step into the Investigative World of Science— where curiosity meets experiment. From microbes to the Moon, and from forces to ecosystems, we explore how observation, questioning, and experimentation help us understand our world and protect our planet.

हिंदी में (Hindi)

कक्षा 8 में हम खोजपूर्ण विज्ञान की दुनिया में कदम रखते हैं— जहाँ जिज्ञासा प्रयोगों से मिलती है। सूक्ष्म जीवों से लेकर चंद्रमा तक, बलों से लेकर पारिस्थितिक तंत्र तक, हम अवलोकन, प्रश्न और प्रयोगों के माध्यम से अपने संसार को समझना और उसकी रक्षा करना सीखते हैं।

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Important Points

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Practice MCQ Questions (51 questions)

Q1. What is the main aim of 'Curiosity'?

Q2. What is the title of the Grade 8 book?

Q3. What did students learn in Grade 6?

Q4. What was explained about science in Grade 7?

Q5. Which aspect of science is highlighted in Grade 8?

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Tough Words (Glossary)

Curiosity

Meaning: Desire to learn or know

अर्थ: जिज्ञासा

"Curiosity drives scientific discovery."

Adventure

Meaning: An exciting journey or experience

अर्थ: रोमांच

"Science is an adventure into the unknown."

Exploration

Meaning: Careful search or travel for discovery

अर्थ: अन्वेषण

"Exploration helps us find new facts."

Wonder

Meaning: A feeling of surprise and admiration

अर्थ: आश्चर्य/विस्मय

"Science begins with wonder."

Evolving

Meaning: Changing and developing over time

अर्थ: विकसित/बदलता हुआ

"Scientific ideas are always evolving."

Investigative

Meaning: Related to careful inquiry and study

अर्थ: अन्वेषणात्मक

"Grade 8 focuses on investigative science."

Investigator

Meaning: A person who carries out research

अर्थ: अन्वेषक

"Each of you is an investigator."

Observation

Meaning: Careful watching and noting of facts

अर्थ: अवलोकन/पर्यवेक्षण

"Good observation is the first step in science."

Experiment

Meaning: A test to discover something

अर्थ: प्रयोग

"We will do a simple experiment with oil."

Design (an experiment)

Meaning: Plan how to carry out a study

अर्थ: योजना बनाना/रचना

"We must design the test carefully."

Variables

Meaning: Things that can change in an experiment

अर्थ: चर

"Identify the variables before starting."

Measure

Meaning: Find the size/amount of something

अर्थ: मापना

"Measure the time it takes to puff."

Understanding

Meaning: Grasp of meaning or knowledge

अर्थ: समझ/बोध

"Experiments deepen our understanding."

Microbes

Meaning: Tiny organisms too small to see

अर्थ: सूक्ष्मजीव

"Some microbes help us digest food."

Infection

Meaning: Illness caused by harmful microbes

अर्थ: संक्रमण

"Vaccines protect us from infection."

Nutritious

Meaning: Good for health and growth

अर्थ: पौष्टिक

"Eat nutritious food to stay healthy."

Vaccine

Meaning: A substance that prevents disease

अर्थ: टीका

"The vaccine was given at school."

Electric current

Meaning: Flow of electric charge

अर्थ: विद्युत धारा

"Electric current runs the motor."

Phenomenon

Meaning: An observable event or fact

अर्थ: प्रकटन/घटना

"Boiling is a physical phenomenon."

Force

Meaning: A push or pull on an object

अर्थ: बल

"A force can change an object’s motion."

Pressure

Meaning: Force per unit area

अर्थ: दाब

"High pressure can flatten a can."

Cyclone

Meaning: A violent rotating storm

अर्थ: चक्रवात

"A cyclone can cause heavy damage."

Particles

Meaning: Very small pieces of matter

अर्थ: कण

"All materials are made of particles."

Element

Meaning: Pure substance of one type of atom

अर्थ: तत्व

"Gold is a chemical element."

Compound

Meaning: Substance of two or more elements chemically bonded

अर्थ: यौगिक

"Water is a compound of hydrogen and oxygen."

Mixture

Meaning: Combination of substances not chemically bonded

अर्थ: मिश्रण

"Air is a mixture of gases."

Solution

Meaning: Uniform mixture of solute and solvent

अर्थ: विलेयन

"Sugar forms a solution in tea."

Dissolve

Meaning: To mix completely into a liquid

अर्थ: घुलना

"Salt dissolves in water easily."

Reflect

Meaning: To bounce back light

अर्थ: परावर्तित होना

"Mirrors reflect light."

Lens

Meaning: Transparent object that bends light

अर्थ: लेंस

"A lens helps us see clearly."

Refraction

Meaning: Bending of light when it passes through a medium

अर्थ: अपवर्तन

"Refraction makes a pencil look bent in water."

Phase (Moon)

Meaning: Appearance of the Moon’s lit part

अर्थ: कलाएँ

"We observe the Moon’s phases every month."

Calendar

Meaning: System for measuring and organizing time

अर्थ: कैलेंडर/पंचांग

"Calendars were made using sky observations."

Ecosystem

Meaning: Community of organisms and their environment

अर्थ: पारिस्थितिकी तंत्र

"A forest is a complex ecosystem."

Ultraviolet

Meaning: High-energy light from the Sun

अर्थ: पराबैंगनी

"Ozone blocks ultraviolet radiation."

Climate

Meaning: Long-term weather patterns

अर्थ: जलवायु

"Climate change affects rainfall."

Delicate

Meaning: Easily damaged, fragile

अर्थ: नाज़ुक

"Earth’s balance is delicate."

Systematic

Meaning: Using an ordered, methodical process

अर्थ: पद्धतिपूर्ण/संगठित

"Do a systematic investigation."

Hypothesis

Meaning: A testable proposed explanation

अर्थ: परिकल्पना

"We wrote a hypothesis before frying puris."

Splatter

Meaning: Scatter drops of liquid

अर्थ: छींटे पड़ना

"Oil may splatter when too hot."

Investigate

Meaning: To carry out a formal inquiry

अर्थ: जाँच/अनुसंधान करना

"Let’s investigate why dough rises."

NCERT Solutions Class 8 Science - Curiosity Chapter 1 – Exploring the Investigative World of Science

Chapter Introduction

Watch Video Lecture

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Important Points

Practice MCQ Questions (51 questions)

Q1. What is the main aim of 'Curiosity'?

Q2. What is the title of the Grade 8 book?

Q3. What did students learn in Grade 6?

Q4. What was explained about science in Grade 7?

Q5. Which aspect of science is highlighted in Grade 8?

Q6. What does 'Investigation in science' mean?

Q7. What does the 'root' symbol in the book represent?

Q8. What does the 'kite' symbol represent?

Q9. When do we get the best results in science?

Q10. What does the combination of 'root' and 'kite' teach us?

Q11. Where does the Grade 8 journey begin?

Q12. What are microorganisms?

Q13. What do some microorganisms do for us?

Q14. How can we stay healthy?

Q15. Which effect of electric current produces heat?

Q16. Which effect of electric current helps run motors?

Q17. What can be understood by studying forces?

Q18. Why does a thrown ball fall back to the ground?

Q19. What does 'pressure' indicate?

Q20. What can low pressure cause?

Q21. What are materials made of?

Q22. How are particles arranged in solids?

Q23. How do particles behave in gases?

Q24. What is an element?

Q25. What is a compound?

Q26. What is a mixture?

Q27. What is a solution?

Q28. Which is an example of a solution?

Q29. What does light do?

Q30. What does a mirror do to light?

Q31. Where are concave and convex mirrors used?

Q32. What is refraction of light?

Q33. How are moon phases formed?

Q34. How were calendars created?

Q35. Why is life possible on Earth?

Q36. What does the atmosphere provide?

Q37. What are human activities doing to Earth?

Q38. What does science help us do?

Q39. What causes changes in Earth's temperature?

Q40. What is the purpose of the question ‘Why is one side of a puri thinner?’

Q41. What can be changed in the puri experiment?

Q42. How many factors should be changed at one time in a scientific experiment?

Q43. What does 'Systematic investigation' mean?

Q44. Why is observation important in experiments?

Q45. Why does a puri puff up?

Q46. What is the core of science?

Q47. What does the last line of the passage inspire?

Q48. What does ‘Curiosity’ teach?

Q49. What do the ‘root’ and ‘kite’ remind us of?

Q50. Science balances which two things?

Q51. What does this chapter inspire us to become?