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Heat Transfer — Flashcards

ICSE · Class 8 · Physics

32 flashcards for Heat Transfer (ICSE Class 8 Physics) to test yourself on key terms and facts. Sample: "State the smallest particle that can exist"

61 questions32 flashcards4 formulas & key relations5 concepts

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32 Flashcards·
Molecules and matterHeat and molecular motionHeatLatent heatEvaporation and boilingRate of evaporationBoiling pointEffect of pressure on boiling
Card 1Molecules and matter

State the smallest particle that can exist freely in nature and retain the properties of a substance.

Answer

A molecule is the smallest particle that can exist freely in nature and retains the properties of the substance. Its size is nearly 10^-10 m, and it cannot be seen even by a microscope.

Card 2Heat and molecular motion

Why does heat make particles move faster?

Answer

Heat increases the internal energy of a substance. The molecules gain kinetic energy, so their motion becomes faster. When a substance is cooled, molecular motion becomes slower and kinetic energy dec…

Card 3Heat

State the definition of heat.

Answer

Heat is the internal energy of a substance. It is measured in joule (J).

Card 4Latent heat

A substance absorbs heat but its temperature does not change during change of state. Why?

Answer

During change of state, the absorbed heat is used to change the forces of attraction between molecules. The average kinetic energy remains unchanged, so the temperature stays constant. This heat is ca…

Card 5Evaporation and boiling

State the difference between evaporation and boiling.

Answer

Evaporation is the change of liquid into vapour from the surface at all temperatures. Boiling is the change of liquid into vapour at a fixed temperature throughout the whole mass of the liquid.

Card 6Rate of evaporation

A liquid evaporates quickly on a windy day. Why?

Answer

The rate of evaporation increases with wind. Moving air removes vapour near the surface, so more molecules can escape from the liquid surface. Evaporation is also faster when temperature and surface a…

Card 7Boiling point

When does water boil?

Answer

Water boils at 100°C.

Card 8Effect of pressure on boiling

A pressure cooker is used for cooking. Why does water boil at a higher temperature inside it?

Answer

Pressure and boiling point are directly related. In a pressure cooker, water boils at nearly 125°C because the pressure is higher than normal. Higher pressure raises the boiling point.

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Frequently Asked Questions

What are the important topics in Heat Transfer for ICSE Class 8 Physics?
Key topics in Heat Transfer include Molecules, Heat, and Temperature, Evaporation and Boiling, Latent Heat and Change of State, Thermal Expansion of Solids. Study these first, then practise questions on each for Class 8 exams.
How many flashcards are available for Heat Transfer?
There are 32 flashcards for Heat Transfer covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Heat Transfer for Class 8 exams?
Learn the core ideas first, then work through the 61 practice questions on Heat Transfer. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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