Download Class 8 Science Practice Worksheets
Review targeted academic worksheets with the CBSE Class 8 Science Heat Transfer Worksheet Set 03. 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 Heat Transfer.
Access Heat Transfer Practice Papers and Solutions
Access the complete worksheet PDF for Class 8 Science below. Regular practice with these targeted academic tasks builds familiarity with standard question patterns and helps secure higher marks in final school examinations.
A. Check Point
1. Differences between boiling and evaporation.
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Answer:
| Boiling | Evaporation |
|---|---|
| Happens at a fixed temperature (the boiling point) | Happens at any temperature |
| Takes place throughout the liquid | Takes place only at the surface |
| Fast, with bubbles | Slow, no bubbles |
| Needs an outside heat source | Heat is taken from the surroundings |
Teacher's Note: Use the key term in your answer.
2. Define temperature and heat transfer. 3. How does heat transfer take place?
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Answer: Temperature is a measure of how hot or cold a body is. Heat transfer is the movement of heat from a hotter body to a colder body. It happens by conduction (through solids), convection (in liquids and gases) and radiation (through waves, even in a vacuum).
Teacher's Note: Give an example if the question allows.
1. What is thermal expansion? 2. Explain linear expansion. 3. What is the coefficient of linear expansion?
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Answer: Thermal expansion is the increase in the length, area or volume of a substance on heating. Linear expansion is the increase in length of a solid rod on heating; the increase is proportional to the original length and to the rise in temperature. The coefficient of linear expansion is the fractional change in length per degree rise in temperature.
Teacher's Note: Write a short, clear answer.
1. What is volume expansion? 2. The coefficient of volume expansion. 1. What is superficial expansion? 2. The equation for the new area. 3. Expansion of solids, liquids and gases.
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Answer: Volume expansion is the increase in the volume of a substance on heating; its coefficient is the fractional change in volume per degree rise in temperature. Superficial expansion is the increase in area. New area = original area + increase in area = A1 (1 + beta x change in temperature). Gases expand the most, liquids less and solids the least, because the molecules of gases are far apart and weakly held.
Teacher's Note: Remember this for your exam.
B. Keywords
5. Define: thermal expansion, linear expansion, volume expansion, superficial expansion.
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Answer: Thermal expansion: increase in the size of a body on heating. Linear expansion: increase in length. Volume expansion: increase in volume. Superficial expansion: increase in area.
Teacher's Note: Learn this point and write it in your own words.
C. Exercise
(i) Vaporisation has ____ types. (ii) Volume expansion depends on. (iii) On heating, the ____ energy of molecules increases. (iv) In a ____ the molecules are far apart. (v) In a heated ____ the atoms vibrate about fixed positions. (vi) Volume is counted for ____ dimensions. (vii) The linear expansion coefficient is the fractional change in. (viii) In a ____ the bonds are not so strong and molecules are mobile. (ix) For boiling an external source of ____ is needed. (x) The volume expansion coefficient is useful for.
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Answer: (i) (b) two; (ii) (d) all of these; (iii) (a) kinetic; (iv) (c) gas; (v) (a) solid; (vi) (c) three; (vii) (a) length; (viii) (b) liquid; (ix) (b) heat; (x) (d) both liquids and gases.
Teacher's Note: Use the key term in your answer.
7. Fill in the blanks: 1. ____ expansion is the increase in area. 2. When the temperature rises, the volume or length also increases; this is ____. 3. In ____, a liquid changes to vapour at a given pressure. 4. Boiling point is affected by ____ pressure. 6. ____ is the fractional change in length per degree. 7. When we increase the temperature of a ____, its volume expands. 8. Every ____ has its own coefficient of expansion. 9. The volume change is proportional to the change in ____. 10. The change in length is related to the temperature change by a constant called the ____.
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Answer: 1. Superficial; 2. thermal expansion; 3. boiling; 4. atmospheric; 6. The coefficient of linear expansion; 7. liquid; 8. material; 9. temperature; 10. coefficient of linear expansion.
Teacher's Note: Give an example if the question allows.
8. True or False: 1. The atoms do not expand but the volume increases. 2. When we heat any state of matter, it does not expand. 3. The ratio of decrease in area per degree rise. 4. The coefficient of superficial expansion is twice the linear. 5. A brass rod expands more than a steel rod. 6. Increase in length is proportional to the original length x rise in temperature. 7. The linear coefficient is useful for the expansion of gas. 8. Evaporation occurs when the partial pressure of vapour is less than the equilibrium vapour pressure. 9. A liquid on heating expands and rises. 10. Pure water can be used as a coolant in a car radiator.
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Answer: 1. True; 2. False; 3. False (it is the increase); 4. True; 5. True; 6. True; 7. False; 8. True; 9. True; 10. False (antifreeze is added, because water freezes and boils too easily).
Teacher's Note: Write a short, clear answer.
9. E1. Define boiling and evaporation; state the difference. E2. Explain thermal expansion. E4. Compare expansion in solids, liquids and gases. E5. Examples of thermal expansion.
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Answer: Boiling is the rapid change of a liquid to vapour throughout the liquid at its boiling point; evaporation is the slow change from the surface at any temperature. Thermal expansion: heat increases the vibration of the particles, so they move farther apart. Gases expand the most, then liquids, then solids. Examples: gaps left between railway tracks, loose power lines in summer, an iron rim fitted on a wooden cart wheel (heated, fitted and cooled), bimetallic strips in thermostats, and the rise of mercury in a thermometer.
Teacher's Note: Remember this for your exam.
Free study material for Science
Download Class 8 Science Heat Transfer Practice Worksheets
Practice Exercises for Class 8 Science Heat Transfer
Access structured practice worksheets for Heat Transfer aligned with the 2026 CBSE curriculum. These downloadable exercises for Class 8 Science help students build accuracy and reinforce core concepts for upcoming school tests.
Step-by-Step Solutions and Practice Guidelines
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.
Enhance Speed with Online Practice
Consistent engagement with these exercises builds familiarity with recurring exam themes. If specific areas within Heat Transfer cause trouble, utilize our dedicated NCERT solutions for Class 8 Science to clear up doubts immediately.
FAQs
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For Heat Transfer, regular practice with our worksheets will improve question-handling speed and help students understand all technical terms and diagrams.