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

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

NS 8TH SCI C N
Published on By Amresh Academy

  


📚✨ 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

 

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