📚✨ Exploring the Investigative World of Science Class 8 Science Chapter 1 Solutions | Curiosity

 

📚✨ Class 8 Science Curiosity – Chapter 1

🔬 Exploring the Investigative World of Science

---

⚡ 🧠 Very Short Answer Questions

---

❓ What is the first step of scientific investigation?

👉 Answer: Asking a question.

---

❓ What makes a puri puff up?

👉 Answer: Steam inside the dough.

---

❓ Name the two effects of electric current.

👉 Answer: Heating effect and magnetic effect.

---

❓ What kind of organisms are found in dirty water?

👉 Answer: Microorganisms.

---

❓ What is used to improve eyesight?

👉 Answer: Lenses.

---

❓ Which natural force brings a ball back to the ground?

👉 Answer: Gravity.

---

❓ Which gas helps in breathing?

👉 Answer: Oxygen.

---

❓ What is the Moon’s changing appearance called?

👉 Answer: Phases of the Moon.

---

❓ Name one simple scientific tool used in experiments.

👉 Answer: Thermometer.

---

❓ Which state of matter allows particles to move freely?

👉 Answer: Gas.

---

❓ What does a calendar help us measure?

👉 Answer: Time.

---

❓ What is the bending of light called?

👉 Answer: Refraction.

---

❓ Which type of surface reflects light best?

👉 Answer: Smooth surface.

---

❓ Name one harmful effect of human activities on Earth.

👉 Answer: Climate change.

---

❓ What is a mixture?

👉 Answer: A combination of two or more substances.

---

🧾 ✍️ Short Answer Questions

---

❓ What is the importance of curiosity in science?

👉 Answer:

Curiosity helps us ask questions about everyday phenomena and motivates us to find answers through observation and investigation. It is the starting point of scientific thinking.

---

❓ How does a puri puff up while frying?

👉 Answer:

When the dough is heated, the water inside turns into steam (भाप). This steam gets trapped and expands, making the puri puff up like a balloon.

---

❓ What are microorganisms and why are they important?

👉 Answer:

Microorganisms are tiny living organisms (सूक्ष्मजीव) found in air, water, and soil.

• Some are useful (digestion, medicines)
• Some are harmful (cause diseases)

---

❓ How do vaccines help us stay healthy?

👉 Answer:

Vaccines prepare our body to fight infections by building immunity against harmful microbes, protecting us from serious diseases.

---

❓ What is the heating effect of electric current?

👉 Answer:

When electric current flows through a conductor, it produces heat energy.

👉 Used in:

• Electric iron
• Heater
• Geyser

---

❓ Explain force with an example.

👉 Answer:

Force is a push or pull that can change motion.

👉 Example: Kicking a football makes it move.

---

❓ Why do cyclones occur?

👉 Answer:

Cyclones form due to difference in air pressure. Warm moist air rises, creating low pressure, and strong winds move towards it, causing storms.

---

❓ What is the role of particles in states of matter?

👉 Answer:

• Solids → tightly packed
• Liquids → slide over each other
• Gases → move freely

👉 This explains different properties of matter.

---

❓ How do mirrors and lenses help in daily life?

👉 Answer:

• Mirrors → reflect light (seeing images)
• Lenses → bend light (used in spectacles, cameras)

---

❓ Why is Earth suitable for life?

👉 Answer:

Earth has:

• Right distance from Sun ☀️
• Liquid water 💧
• Oxygen-rich atmosphere 🌬️

👉 These make life possible.

---

🧠 📝 Descriptive Questions

---

❓ Describe the steps of scientific investigation.

👉 Answer:

1️⃣ Ask a clear question

2️⃣ Plan an experiment

3️⃣ Change only one variable

4️⃣ Observe and record results

5️⃣ Analyze and conclude

---

❓ Explain uses of electric current in daily life.

👉 Answer:

1️⃣ Provides light 💡

2️⃣ Produces heat 🔥

3️⃣ Runs motors ⚙️

4️⃣ Powers appliances (TV, fan, fridge)

---

❓ Differentiate between elements, compounds, and mixtures.

👉 Answer:

• Element: Pure substance of one atom (e.g., Iron)
• Compound: Chemically combined elements (e.g., Water)
• Mixture: Physically combined substances (e.g., Air)

---

❓ Explain different behaviors of light.

👉 Answer:

1️⃣ Reflection → light bounces back

2️⃣ Refraction → light bends

3️⃣ Scattering → rough surfaces spread light

4️⃣ Helps in vision and optical devices

---

❓ Why are human activities affecting Earth’s climate?

👉 Answer:

1️⃣ Burning fossil fuels increases greenhouse gases

2️⃣ Deforestation reduces oxygen

3️⃣ Pollution harms environment

4️⃣ Overuse of resources disturbs balance

---

🌈 🎯 Final Revision Boost

🔑 Golden Points

• Science begins with curiosity 🔍
• Investigation = Question + Experiment + Observation
• Everyday life is full of scientific concepts

---

🚀 Pro Tip for Students:

👉 Learn answers in points + keywords

👉 Focus on concept clarity + examples

---