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CBSE Class 7  >  Class 7 Notes  >  Science (Curiosity) - New NCERT  >  Worksheet: Heat Transfer in Nature

Heat Transfer In Nature Worksheet - Class 7 Science | with answers

Q.1. True/False

(i) Metals are poor conductors of heat.

(i) Land breeze occurs during the night.

(i) Dark-colored clothes absorb less heat than light-colored clothes.

(i) Water vapor released by plants is called transpiration.

(i) Radiation requires air or water to transfer heat.

Q.2. Fill in the blanks.

(i)  The hotness of an object is determined by its ____.

(ii) Temperature is measured in degree ____.

(iii) A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of ____.

(vi) Dark colored clothes are preferred during ____.

(v) Poor conductors are known as ____.

Answer the following Questions 

Q.3. Does the transfer of heat by radiation require any medium?

Q.4. What is the concern associated with the use of mercury thermometers?

Q.5. How water get heated when kept on flame?

Q.6. Which device is used to measure temperature?

Q.7. How does heat flow from one object to another?

Q.8. Do all hot bodies radiate heat?

Q.9. How does heat transfer in solids?

Q.10. What is Conduction?

Q.11. Explain the process of conduction with an example.

Q.12. What is convection and how does it affect coastal areas?

Q.13. Describe radiation and give two real-life applications.

Q.14. How does the water cycle help in redistributing water on Earth?

Q.15. What are ice stupas and how do they help conserve water in Ladakh?

For Worksheet Solutions, go to Worksheet Solutions: Heat Transfer in Nature

The document Worksheet: Heat Transfer in Nature is a part of the Class 7 Course Science (Curiosity) Class 7 - New NCERT.
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FAQs on Worksheet: Heat Transfer in Nature

1. What are the three main ways heat travels through materials in Class 7 Science?
Ans. Heat transfers through three methods: conduction (direct contact between objects), convection (movement through fluids like air and water), and radiation (electromagnetic waves requiring no medium). Conduction occurs in solids when heat energy passes from hot to cold regions. Convection happens in liquids and gases as warm particles rise and cool particles sink. Radiation allows heat to travel through empty space, like sunlight warming Earth.
2. Why does a metal spoon get hot faster than a wooden spoon when placed in hot water?
Ans. Metals are excellent thermal conductors because their atoms transfer heat energy rapidly through direct contact, a process called heat conduction. Wood is a poor conductor with tightly bound atoms that resist energy transfer. In CBSE Class 7 Science, this difference explains why cookware uses metal handles and wooden spoons for safety. Thermal conductivity determines how quickly heat spreads through a material's structure.
3. How does convection heating work in a room, and why does warm air rise?
Ans. Convection occurs when warm air becomes less dense, causing it to rise, while cooler, denser air sinks, creating circular currents called convection currents. This natural circulation pattern in fluids transfers heat throughout spaces without any direct contact. In Class 7 heat transfer lessons, understanding convection explains how room heaters, refrigerators, and ocean currents distribute thermal energy. The density difference drives continuous movement.
4. Can heat travel through a vacuum, and how is this different from conduction and convection?
Ans. Heat travels through vacuum via radiation, the only heat transfer method that doesn't require a medium like air or solid material. Unlike conduction (requiring direct contact) and convection (needing fluids), radiation uses electromagnetic waves. The Sun warming Earth across empty space demonstrates radiant heat transfer. For CBSE Class 7 students, recognising this distinction helps explain why all three mechanisms operate differently in nature's heat transfer processes.
5. What everyday examples of heat transfer should I know for my Class 7 Science worksheet questions?
Ans. Common examples include: boiling water (convection), touching a hot cup (conduction), and feeling sunlight on skin (radiation). Other instances are: ice melting near a heater, sea breezes forming, and cooking food in an oven. These natural phenomena demonstrate heat transfer in nature across different contexts. Referring to mind maps and flashcards helps visualise which mechanism occurs in each scenario for better worksheet problem-solving and exam preparation.
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