Experiment with Water on Everyday Life for Class 6 Sainik School Exam GK Study Material Notes Download Free

Best Study Material and Notes which explore the fascinating experiments and concepts related to water in everyday life for Sainik School Exam AISSEE preparation. Learn about buoyancy, surface tension, capillary action, evaporation, condensation, and more with detailed question-answer explanations, facts, worksheets, and practice questions.

Water is one of the most essential substances on Earth. It plays a crucial role in various physical and chemical processes. In our daily life, we observe many interesting phenomena related to water, such as dissolving, floating, sinking, evaporation, condensation, and surface tension. Let’s explore these concepts in a question-answer format.

Experiment with Water in Everyday Life for All India Sainik Schools Entrance Examination

Q1: Why is water called the ‘universal solvent’?

A: Water is known as the universal solvent because it can dissolve a wide variety of substances, such as salt, sugar, and gases like oxygen and carbon dioxide. This ability makes water essential for biological and chemical processes in nature and daily life.

Q2: What is the difference between soluble and insoluble substances? Give examples.

A:

• Soluble substances dissolve completely in water, forming a uniform solution. Example: Sugar, salt.
• Insoluble substances do not dissolve in water and remain separate. Example: Sand, oil.

Q3: Why do some objects float on water while others sink?

A: The floating or sinking of an object depends on its density compared to water:

• If an object has lower density than water, it floats (e.g., wood, plastic, ice).
• If an object has higher density than water, it sinks (e.g., stone, iron).
  This is explained by Archimedes’ Principle, which states that an object in a fluid experiences an upward force (buoyant force) equal to the weight of the fluid displaced.

Q4: What is surface tension? Explain with an example.

A: Surface tension is the property of water that causes its molecules to stick together, forming a ‘skin’ on the surface. This is due to the cohesive force between water molecules.

📌 Example: Water striders (insects) can walk on the surface of water without sinking due to surface tension.

Q5: Why does water take the shape of its container?

A: Water is a liquid, and liquids do not have a fixed shape. Instead, they take the shape of the container they are in. However, they have a fixed volume, meaning their quantity remains the same regardless of the container.

Q6: Why does ice float on water?

A: Ice floats on water because it is less dense than liquid water. When water freezes, it expands, increasing the space between molecules. This makes ice lighter than an equal volume of liquid water, allowing it to float.

Q7: What happens when we heat water in a closed container?

A: When water is heated in a closed container:

• It turns into steam (water vapor), increasing pressure inside.
• If pressure builds up excessively, it may cause the container to burst.
  This is why pressure cookers have safety valves to release excess steam.

Q8: What is capillary action? Give an example.

A: Capillary action is the ability of water to move through narrow tubes or spaces without the help of external forces like gravity.

📌 Example: Water moves up in the roots and stems of plants through xylem due to capillary action, helping plants transport water from the soil to their leaves.

Q9: Why does salt dissolve in water but sand does not?

A: Salt dissolves in water because its molecules break into sodium (Na⁺) and chloride (Cl⁻) ions, which mix evenly with water molecules.
Sand does not dissolve because its particles are too large and do not interact well with water molecules.

Q10: What is evaporation? Give a real-life example.

A: Evaporation is the process in which liquid water changes into vapor due to heat.

📌 Example: Wet clothes dry faster in the sun because heat increases the rate of evaporation, turning water in the fabric into vapor.

Q11: Why do water droplets form on the outside of a cold glass?

A: This happens due to condensation. The water vapor in the air comes in contact with the cold surface of the glass, losing heat and turning into liquid water droplets.

Q12: What happens when we mix oil and water?

A: Oil and water do not mix because:

• Water is polar, meaning its molecules have a positive and negative end.
• Oil is non-polar, so it does not mix with polar substances.
  As a result, oil forms a separate layer above the water.

Q13: Why do clothes dry faster on a windy day?

A: Clothes dry faster because the wind carries away the water vapor formed due to evaporation, increasing the drying rate.

Q14: What happens if we place a dry sponge in water?

A: The sponge absorbs water due to capillary action, filling its tiny holes and increasing its weight.

Q15: Why does warm water rise and cold water sink?

A: Warm water is less dense than cold water, so it rises, while cold water, being denser, sinks. This process is known as convection, which helps distribute heat in oceans, lakes, and even in our atmosphere.

Q16: What is the water cycle? Explain its stages.

A: The water cycle is the continuous movement of water on, above, and below the Earth’s surface. It consists of the following stages:

1. Evaporation – Water from rivers, lakes, and oceans turns into vapor due to heat.
2. Condensation – Water vapor cools and forms clouds.
3. Precipitation – Clouds release water as rain, snow, or hail.
4. Collection – Water gathers in lakes, rivers, and underground reservoirs.

Q17: What is the difference between hard water and soft water?

A:

• Hard water contains high amounts of dissolved minerals like calcium and magnesium. It does not form lather easily with soap. Example: Groundwater.
• Soft water has fewer dissolved minerals and lathers easily with soap. Example: Rainwater.

Q18: How does water help regulate Earth’s climate?

A: Water absorbs and releases heat slowly, helping to moderate temperatures. Large water bodies like oceans prevent extreme temperature fluctuations, making Earth habitable.

Q19: What happens if we pour salt water and fresh water into a container?

A:

• Salt water is denser than fresh water, so it will settle at the bottom.
• If mixed slowly, a layered effect will be seen due to density differences.
• This phenomenon is observed in oceans where saltwater and freshwater meet (estuaries).

Q20: What is desalination? Why is it important?

A: Desalination is the process of removing salt from seawater to make it drinkable. It is important because it provides freshwater in areas with water shortages.

Q21: What are aquifers?

A: Aquifers are underground layers of rock that store water. They supply drinking water through wells and are crucial sources of freshwater.

Q22: Why do water pipes burst in winter in very cold places?

A: Water expands when it freezes, increasing pressure inside pipes. If the pressure becomes too high, the pipes burst.

Q23: What is sublimation? Give an example related to water.

A: Sublimation is the process where a solid directly changes into gas without becoming a liquid.
📌 Example: Ice or snow in very cold and dry conditions can turn directly into water vapor.

Q24: Why does steam cause more severe burns than boiling water?

A: Steam carries more heat energy than boiling water due to latent heat of vaporization. When steam comes in contact with the skin, it releases this extra heat, causing severe burns.

Q25: Why does a raincoat repel water?

A: Raincoats are made of materials like plastic or rubber, which are hydrophobic (water-repelling). These materials do not allow water to pass through.

Application-Based Questions for AISSEE Preparation

✅ Q26: If you have a bottle of cold water and a bottle of warm water, which one will evaporate faster? Why?
✅ Q27: Why do deep lakes and oceans remain liquid even in freezing weather?
✅ Q28: Why does salt help in melting ice on roads in winter?
✅ Q29: How does water get purified naturally in nature?
✅ Q30: What happens when you boil water in an open vessel versus a closed one?

Scientific Experiments with Water at Home

🧪 Experiment 1: Floating Egg Experiment
📌 Concept: Density and Buoyancy
🔹 Fill a glass with water and place an egg in it. It sinks.
🔹 Now, add salt to the water and stir.
🔹 The egg will start floating!
Why? The addition of salt increases the density of water, making it easier for the egg to float.

🧪 Experiment 2: Magic Water and Pepper Trick
📌 Concept: Surface Tension
🔹 Fill a plate with water and sprinkle black pepper on it.
🔹 Dip a soap-covered finger into the water.
🔹 The pepper quickly moves away!
Why? The soap breaks the surface tension of water, making the pepper move apart.

Interesting Facts About Water

💧 Water expands by 9% when frozen, which is why ice floats.
💧 The Dead Sea is so salty that people can float on it easily.
💧 More than 70% of the human brain is made up of water.
💧 A single drop of water may contain millions of tiny organisms.
💧 A person can survive without food for weeks but only a few days without water.

Quick Revision Notes for AISSEE

📌 Water Cycle: Evaporation → Condensation → Precipitation → Collection
📌 Surface Tension: Water molecules stick together, allowing insects to walk on water.
📌 Buoyancy: Objects float if they are less dense than water.
📌 Capillary Action: Water moves up narrow tubes, like in plant roots.
📌 Evaporation & Condensation: Water turns to vapor when heated and back to liquid when cooled.
📌 Hard vs. Soft Water: Hard water contains minerals; soft water does not.
📌 Desalination: The process of turning seawater into drinkable water.

🔹 Practice Worksheet 🔹

💡 Fill in the blanks:
1️⃣ Water freezes at __°C.
2️⃣ Ice floats because it is __ than water.
3️⃣ The process of changing water into vapor is called __.
4️⃣ A __ is an underground layer that stores water.
5️⃣ The pH of pure water is __.

💡 True or False:
1️⃣ Water is a good conductor of electricity. ❌
2️⃣ Boiling water turns into ice. ❌
3️⃣ Saltwater is denser than freshwater. ✅
4️⃣ Oil dissolves easily in water. ❌
5️⃣ Water expands when it freezes. ✅

💡 Match the following:

Interesting Facts About Water (Do You Know?)

✔ Water covers about 71% of Earth’s surface but only 3% is freshwater.
✔ The boiling point of water is 100°C at sea level but decreases at higher altitudes.
✔ Water expands when it freezes, making icebergs float on oceans.
✔ Our body is made up of about 60-70% water.
✔ The pH of pure water is 7, making it neutral.
✔ Rainwater is the purest form of natural water but may collect impurities from the air.

Key Concepts Recap (Quick Revision Points)

📌 Solubility: Some substances dissolve in water (salt, sugar), while others do not (sand, oil).
📌 Buoyancy: Objects float or sink depending on their density.
📌 Surface Tension: Water molecules stick together, allowing insects to walk on water.
📌 Capillary Action: Water moves up narrow spaces, like in plants.
📌 Evaporation & Condensation: Water turns into vapor when heated and back into liquid when cooled.
📌 Ice Floats: Because it is less dense than water.

Practice Questions for AISSEE Preparation

1️⃣ What is the boiling point of water at sea level?
2️⃣ Why does a steel needle sink in water but a large ship made of steel floats?
3️⃣ Explain why we see water droplets on the surface of a glass of ice water.
4️⃣ What will happen if we add more salt to water? Will it increase or decrease the density?
5️⃣ How does water help in regulating body temperature?

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