Chapter-wise Worksheets for Class 8 Science: Water
Review targeted academic worksheets with the CBSE Class 8 Science Water Worksheet Set 08. Built according to official educational standards for the 2026-27 term, these downloadable Class 8 Science resources support effective daily practice and detailed self-evaluation for Water.
Practice Class 8 Science Worksheets: Water
View or download the dedicated CBSE Class 8 Science Water Worksheet Set 08 resource below. Engaging with these practice papers under focused study conditions ensures continuous academic progress and mastery of the 2026-27 curriculum for Water.
A. Check Point
1. What is the primary source of water on earth?
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Answer: Rain, which comes from the water cycle; the oceans hold most of the earth's water.
Teacher's Note: Use the key term in your answer.
2. List the different sources of water.
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Answer: Rain, rivers, lakes, ponds, oceans, wells, springs and glaciers.
Teacher's Note: Give an example if the question allows.
3. Difference between surface water and groundwater.
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Answer: Surface water is found on the earth's surface in rivers, lakes and oceans. Groundwater seeps into the soil and collects above an impermeable rock layer, from where we get it by wells and tubewells.
Teacher's Note: Write a short, clear answer.
4. Three uses of water.
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Answer: Drinking and cooking, washing and bathing, and irrigation of crops. (It is also used in industry and for generating power.)
Teacher's Note: Remember this for your exam.
5. Describe the anomalous behaviour of water.
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Answer: Most liquids contract on cooling, but water contracts only up to 4 degrees Celsius, where its density is the highest. Below 4 degrees it expands, so ice is lighter than water and floats. This allows aquatic life to survive under frozen lakes.
Teacher's Note: Learn this point and write it in your own words.
6. True or False: 1. Sugar solution is a true solution. 2. A colloidal solution does not transmit light. 3. Suspensions scatter a beam of light. 4. Particle size is greater in suspensions than in colloids. 5. Anhydrous salts contain water that gives them colour. 6. Silica gel packets absorb moisture.
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Answer: 1. True; 2. False; 3. True; 4. True; 5. False (hydrated salts contain water of crystallisation); 6. True.
Teacher's Note: Use the key term in your answer.
1. What is hard water? How is it different from soft water?
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Answer: Hard water does not form lather easily with soap because it has dissolved calcium and magnesium salts. Soft water forms lather easily.
Teacher's Note: Give an example if the question allows.
2. Methods to remove hardness.
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Answer: Boiling (for temporary hardness), adding washing soda (sodium carbonate), and ion-exchange or distillation.
Teacher's Note: Write a short, clear answer.
3. Temporary and permanent hardness.
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Answer: Temporary hardness is caused by calcium or magnesium bicarbonates and is removed by boiling. Permanent hardness is caused by calcium or magnesium chlorides and sulphates and is removed by washing soda.
Teacher's Note: Remember this for your exam.
4. One disadvantage of hard water.
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Answer: It wastes soap and leaves scum, and it forms scale in boilers and kettles.
Teacher's Note: Learn this point and write it in your own words.
B. Keywords
11. Define the keywords.
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Answer: Surface water: water on the earth's surface. Groundwater: water below the surface. Solute: the substance that dissolves. Solvent: the substance in which it dissolves. Solution: a uniform mixture of solute and solvent. Aqueous solution: water is the solvent; non-aqueous: another liquid is the solvent. Crystals: solids with a regular shape. Crystallisation: forming crystals from a saturated solution. Hydrated salts: salts containing water of crystallisation. Anhydrous salts: salts without water of crystallisation. Hygroscopic substances: those that absorb moisture from air. Hard water: water that does not lather with soap; soft water: water that does. Temporary hardness: removed by boiling; permanent hardness: not removed by boiling.
Teacher's Note: Use the key term in your answer.
C. Exercise
(i) Not a source of surface water: (a) rivers (b) lake (c) well (d) oceans
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Answer: (c) Well.
Teacher's Note: Give an example if the question allows.
(ii) Water that seeps into the soil and collects above rock: (a) pond (b) rain (c) groundwater (d) sea
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Answer: (c) Groundwater.
Teacher's Note: Write a short, clear answer.
(iii) Reactivity order: (a) K>Na>Ca>Mg (b) K>Ca>Mg>Na (c) Ca>Na>Mg>K (d) K>Na>Mg>Ca
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Answer: (a) K>Na>Ca>Mg.
Teacher's Note: Remember this for your exam.
(v) In a salt solution, salt is (a) solute (b) solvent (c) solution (d) none
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Answer: (a) Solute.
Teacher's Note: Learn this point and write it in your own words.
(vi) Hydrogen and oxygen combine by volume in the ratio (a) 2:1 (b) 3:1 (c) 2:3 (d) none
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Answer: (a) 2:1.
Teacher's Note: Use the key term in your answer.
(vii) Temporary hardness is due to bicarbonates of (a) calcium and magnesium (b) magnesium and potassium (c) calcium and sodium (d) potassium and magnesium
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Answer: (a) Calcium and magnesium.
Teacher's Note: Give an example if the question allows.
18. True or False: 1. We do not need water for domestic purposes. 2. About 50 per cent of the earth's surface is covered with water. 3. Pure water is neutral and does not change the colour of litmus. 4. Hydrated salts absorb moisture in a bottle. 5. Permanent hardness is removed by boiling.
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Answer: 1. False; 2. False (about 71 per cent); 3. True; 4. False (anhydrous or hygroscopic substances do); 5. False.
Teacher's Note: Write a short, clear answer.
19. Fill in the blanks: 1. ____ showed that water is produced by passing a spark through two volumes of hydrogen and one of oxygen. 2. A solution in which no more solute can dissolve at a given temperature is called ____. 3. Solutions are classified as ____, colloidal solution and ____. 4. At a given temperature, different substances dissolve to ____ extents in the same ____ of solvent. 5. When hydrated salts are heated, they lose their ____.
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Answer: 1. Henry Cavendish; 2. a saturated solution; 3. true solution, suspension; 4. different, amount; 5. water of crystallisation.
Teacher's Note: Remember this for your exam.
20. Give reasons: 1. Water is a universal solvent. 2. Silica gel packs are used in bottles.
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Answer: 1. Water dissolves a large number of substances, more than any other liquid. 2. Silica gel absorbs moisture, so it keeps the contents of the bottle dry.
Teacher's Note: Learn this point and write it in your own words.
1. Different uses of water. 2. Three chemical properties of water.
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Answer: 1. Drinking, cooking, bathing, washing, farming, industry and electricity generation. 2. Water is neutral to litmus; it reacts with active metals like sodium to release hydrogen; it reacts with metal oxides to form bases and with non-metal oxides to form acids.
Teacher's Note: Use the key term in your answer.
3. Distinguish between suspensions and colloids.
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Answer:
| Suspension | Colloid |
|---|---|
| Large particles, visible to the eye | Medium particles |
| Particles settle on standing | Particles do not settle |
| Scatters light and is opaque or cloudy | Scatters light (Tyndall effect) |
| Example: muddy water | Example: milk |
Teacher's Note: Give an example if the question allows.
4. What is a supersaturated solution?
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Answer: A solution that contains more solute than it can normally hold at a given temperature. It is prepared by cooling a hot saturated solution slowly.
Teacher's Note: Write a short, clear answer.
5. What is water of crystallisation? How are copper sulphate crystals made?
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Answer: Water of crystallisation is the fixed number of water molecules present in a crystal of a salt. To make copper sulphate crystals, dissolve copper sulphate in hot water with a little dilute sulphuric acid to make a saturated solution, filter it, and let it cool slowly; blue crystals form.
Teacher's Note: Remember this for your exam.
6. Effect of heat on hydrated salts.
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Answer: On heating, they lose their water of crystallisation and change colour and shape. Blue copper sulphate crystals (CuSO4.5H2O) become white anhydrous copper sulphate powder.
Teacher's Note: Learn this point and write it in your own words.
7. Differences between temporary and permanent hardness and their treatment.
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Answer: Temporary hardness (bicarbonates of calcium and magnesium) is removed by boiling. Permanent hardness (chlorides and sulphates of calcium and magnesium) is removed by adding washing soda.
Teacher's Note: Use the key term in your answer.
8. Two disadvantages of hard water.
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Answer: It wastes soap, and it deposits scale in boilers and pipes. It is also not good for cooking pulses.
Teacher's Note: Give an example if the question allows.
28. Complete the equations: 1-2 (temporary hardness on boiling); 3. MgSO4 + Na2CO3; 4. CaSO4 + Na2CO3.
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Answer: On boiling: Ca(HCO3)2 gives CaCO3 + H2O + CO2, and Mg(HCO3)2 gives MgCO3 + H2O + CO2. 3. MgSO4 + Na2CO3 gives MgCO3 + Na2SO4. 4. CaSO4 + Na2CO3 gives CaCO3 + Na2SO4.
Teacher's Note: Write a short, clear answer.
Free study material for Science
CBSE Class 8 Science Worksheets for Water
Daily Practice Questions for Class 8 Science
Review targeted practice exercises for Class 8 Science Water. Curated to match official CBSE guidelines, these printable problem sets support daily revision and improve overall test readiness.
Detailed Answers for Class 8 Science Water
Built using official NCERT guidelines for Class 8 Science, these practice sheets provide reliable academic support. Cross-reference your completed work with our detailed solutions to learn standard answer-writing formats for CBSE exams.
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FAQs
You can download the latest chapter-wise printable worksheets for Class 8 Science Water for free from StudiesToday.com. These have been made as per the latest CBSE curriculum for this academic year.
Yes, Class 8 Science worksheets for Water focus on activity-based learning and also competency-style questions. This helps students to apply theoretical knowledge to practical scenarios.
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Yes, our Class 8 Science test sheets are mobile-friendly PDFs and can be printed by teachers for classroom.
For Water, regular practice with our worksheets will improve question-handling speed and help students understand all technical terms and diagrams.